/*
 * kmp_alloc.c -- private/shared dyanmic memory allocation and management
 */


//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//


#include "kmp.h"
#include "kmp_wrapper_malloc.h"
#include "kmp_io.h"

// Disable bget when it is not used
#if KMP_USE_BGET

/* Thread private buffer management code */

typedef int   (*bget_compact_t)(size_t, int);
typedef void *(*bget_acquire_t)(size_t);
typedef void  (*bget_release_t)(void *);

/* NOTE: bufsize must be a signed datatype */

#if KMP_OS_WINDOWS
# if KMP_ARCH_X86 || KMP_ARCH_ARM
   typedef kmp_int32 bufsize;
# else
   typedef kmp_int64 bufsize;
# endif
#else
  typedef ssize_t bufsize;
#endif

/* The three modes of operation are, fifo search, lifo search, and best-fit */

typedef enum bget_mode {
    bget_mode_fifo = 0,
    bget_mode_lifo = 1,
    bget_mode_best = 2
} bget_mode_t;


static void    bpool( kmp_info_t *th, void *buffer, bufsize len);
static void   *bget( kmp_info_t *th, bufsize size);
static void   *bgetz( kmp_info_t *th, bufsize size);
static void   *bgetr( kmp_info_t *th, void *buffer, bufsize newsize);
static void    brel( kmp_info_t *th, void *buf);
static void    bectl(  kmp_info_t *th, bget_compact_t compact, bget_acquire_t acquire, bget_release_t release, bufsize pool_incr );

#ifdef KMP_DEBUG
static void    bstats( kmp_info_t *th, bufsize *curalloc, bufsize *totfree, bufsize *maxfree, long *nget, long *nrel);
static void    bstatse( kmp_info_t *th, bufsize *pool_incr, long *npool, long *npget, long *nprel, long *ndget, long *ndrel);
static void    bufdump( kmp_info_t *th, void *buf);
static void    bpoold( kmp_info_t *th, void *pool, int dumpalloc, int dumpfree);
static int     bpoolv( kmp_info_t *th, void *pool);
#endif

/* BGET CONFIGURATION */
                                      /* Buffer allocation size quantum:
                                         all buffers allocated are a
                                         multiple of this size.  This
                                         MUST be a power of two. */

                                      /* On IA-32 architecture with  Linux* OS,
                                         malloc() does not
                                         ensure 16 byte alignmnent */

#if KMP_ARCH_X86 || !KMP_HAVE_QUAD

#define SizeQuant   8
#define AlignType   double

#else

#define SizeQuant   16
#define AlignType   _Quad

#endif

#define BufStats    1                 /* Define this symbol to enable the
                                         bstats() function which calculates
                                         the total free space in the buffer
                                         pool, the largest available
                                         buffer, and the total space
                                         currently allocated. */

#ifdef KMP_DEBUG

#define BufDump     1                 /* Define this symbol to enable the
                                         bpoold() function which dumps the
                                         buffers in a buffer pool. */

#define BufValid    1                 /* Define this symbol to enable the
                                         bpoolv() function for validating
                                         a buffer pool. */

#define DumpData    1                 /* Define this symbol to enable the
                                         bufdump() function which allows
                                         dumping the contents of an allocated
                                         or free buffer. */
#ifdef NOT_USED_NOW

#define FreeWipe    1                 /* Wipe free buffers to a guaranteed
                                         pattern of garbage to trip up
                                         miscreants who attempt to use
                                         pointers into released buffers. */

#define BestFit     1                 /* Use a best fit algorithm when
                                         searching for space for an
                                         allocation request.  This uses
                                         memory more efficiently, but
                                         allocation will be much slower. */
#endif /* NOT_USED_NOW */
#endif /* KMP_DEBUG */


static bufsize bget_bin_size[ ] = {
    0,
//    1 << 6,    /* .5 Cache line */
    1 << 7,    /* 1 Cache line, new */
    1 << 8,    /* 2 Cache lines */
    1 << 9,    /* 4 Cache lines, new */
    1 << 10,   /* 8 Cache lines */
    1 << 11,   /* 16 Cache lines, new */
    1 << 12,
    1 << 13,   /* new */
    1 << 14,
    1 << 15,   /* new */
    1 << 16,
    1 << 17,
    1 << 18,
    1 << 19,
    1 << 20,    /*  1MB */
    1 << 21,    /*  2MB */
    1 << 22,    /*  4MB */
    1 << 23,    /*  8MB */
    1 << 24,    /* 16MB */
    1 << 25,    /* 32MB */
};

#define MAX_BGET_BINS   (int)(sizeof(bget_bin_size) / sizeof(bufsize))

struct bfhead;

/*  Declare the interface, including the requested buffer size type,
    bufsize.  */

/* Queue links */

typedef struct qlinks {
    struct bfhead *flink;             /* Forward link */
    struct bfhead *blink;             /* Backward link */
} qlinks_t;

/* Header in allocated and free buffers */

typedef struct bhead2 {
    kmp_info_t *bthr;                 /* The thread which owns the buffer pool */
    bufsize     prevfree;             /* Relative link back to previous
                                         free buffer in memory or 0 if
                                         previous buffer is allocated.  */
    bufsize     bsize;                /* Buffer size: positive if free,
                                         negative if allocated. */
} bhead2_t;

/* Make sure the bhead structure is a multiple of SizeQuant in size. */

typedef union bhead {
    KMP_ALIGN( SizeQuant )
    AlignType           b_align;
    char                b_pad[ sizeof(bhead2_t) + (SizeQuant - (sizeof(bhead2_t) % SizeQuant)) ];
    bhead2_t            bb;
} bhead_t;
#define BH(p)   ((bhead_t *) (p))

/*  Header in directly allocated buffers (by acqfcn) */

typedef struct bdhead
{
    bufsize tsize;                    /* Total size, including overhead */
    bhead_t bh;                       /* Common header */
} bdhead_t;
#define BDH(p)  ((bdhead_t *) (p))

/* Header in free buffers */

typedef struct bfhead {
    bhead_t  bh;                      /* Common allocated/free header */
    qlinks_t ql;                      /* Links on free list */
} bfhead_t;
#define BFH(p)  ((bfhead_t *) (p))

typedef struct thr_data {
    bfhead_t freelist[ MAX_BGET_BINS ];
#if BufStats
    size_t totalloc;               /* Total space currently allocated */
    long numget, numrel;           /* Number of bget() and brel() calls */
    long numpblk;                  /* Number of pool blocks */
    long numpget, numprel;         /* Number of block gets and rels */
    long numdget, numdrel;         /* Number of direct gets and rels */
#endif /* BufStats */

    /* Automatic expansion block management functions */
    bget_compact_t compfcn;
    bget_acquire_t acqfcn;
    bget_release_t relfcn;

    bget_mode_t    mode;              /* what allocation mode to use? */

    bufsize exp_incr;                 /* Expansion block size */
    bufsize pool_len;                 /* 0: no bpool calls have been made
                                         -1: not all pool blocks are
                                             the same size
                                         >0: (common) block size for all
                                             bpool calls made so far
                                      */
    bfhead_t * last_pool;             /* Last pool owned by this thread (delay dealocation) */
} thr_data_t;

/*  Minimum allocation quantum: */

#define QLSize  (sizeof(qlinks_t))
#define SizeQ   ((SizeQuant > QLSize) ? SizeQuant : QLSize)
#define MaxSize (bufsize)( ~ ( ( (bufsize)( 1 ) << ( sizeof( bufsize ) * CHAR_BIT - 1 ) ) | ( SizeQuant - 1 ) ) )
    // Maximun for the requested size.

/* End sentinel: value placed in bsize field of dummy block delimiting
   end of pool block.  The most negative number which will  fit  in  a
   bufsize, defined in a way that the compiler will accept. */

#define ESent   ((bufsize) (-(((((bufsize)1)<<((int)sizeof(bufsize)*8-2))-1)*2)-2))

/* ------------------------------------------------------------------------ */

/* Thread Data management routines */

static int
bget_get_bin( bufsize size )
{
    // binary chop bins
    int lo = 0, hi = MAX_BGET_BINS - 1;

    KMP_DEBUG_ASSERT( size > 0 );

    while ( (hi - lo) > 1 ) {
        int mid = (lo + hi) >> 1;
        if (size < bget_bin_size[ mid ])
            hi = mid - 1;
        else
            lo = mid;
    }

    KMP_DEBUG_ASSERT( (lo >= 0) && (lo < MAX_BGET_BINS) );

    return lo;
}

static void
set_thr_data( kmp_info_t *th )
{
    int i;
    thr_data_t *data;

    data =
        (thr_data_t *)(
            ( ! th->th.th_local.bget_data ) ? __kmp_allocate( sizeof( *data ) ) : th->th.th_local.bget_data
        );

    memset( data, '\0', sizeof( *data ) );

    for (i = 0; i < MAX_BGET_BINS; ++i) {
        data->freelist[ i ].ql.flink = & data->freelist[ i ];
        data->freelist[ i ].ql.blink = & data->freelist[ i ];
    }

    th->th.th_local.bget_data = data;
    th->th.th_local.bget_list = 0;
#if ! USE_CMP_XCHG_FOR_BGET
#ifdef USE_QUEUING_LOCK_FOR_BGET
    __kmp_init_lock( & th->th.th_local.bget_lock );
#else
    __kmp_init_bootstrap_lock( & th->th.th_local.bget_lock );
#endif /* USE_LOCK_FOR_BGET */
#endif /* ! USE_CMP_XCHG_FOR_BGET */
}

static thr_data_t *
get_thr_data( kmp_info_t *th )
{
    thr_data_t *data;

    data = (thr_data_t *) th->th.th_local.bget_data;

    KMP_DEBUG_ASSERT( data != 0 );

    return data;
}


#ifdef KMP_DEBUG

static void
__kmp_bget_validate_queue( kmp_info_t *th )
{
    /* NOTE: assume that the global_lock is held */

    void *p = (void *) th->th.th_local.bget_list;

    while (p != 0) {
        bfhead_t *b = BFH(((char *) p) - sizeof(bhead_t));

        KMP_DEBUG_ASSERT(b->bh.bb.bsize != 0);
        p = (void *) b->ql.flink;
    }
}

#endif

/* Walk the free list and release the enqueued buffers */

static void
__kmp_bget_dequeue( kmp_info_t *th )
{
    void *p = TCR_SYNC_PTR(th->th.th_local.bget_list);

    if (p != 0) {
        #if USE_CMP_XCHG_FOR_BGET
            {
                volatile void *old_value = TCR_SYNC_PTR(th->th.th_local.bget_list);
                while ( ! KMP_COMPARE_AND_STORE_PTR(
                    & th->th.th_local.bget_list, old_value, NULL ) )
                {
                    KMP_CPU_PAUSE();
                    old_value = TCR_SYNC_PTR(th->th.th_local.bget_list);
                }
                p = (void *) old_value;
            }
        #else /* ! USE_CMP_XCHG_FOR_BGET */
            #ifdef USE_QUEUING_LOCK_FOR_BGET
                __kmp_acquire_lock( & th->th.th_local.bget_lock,
                                    __kmp_gtid_from_thread(th) );
            #else
                __kmp_acquire_bootstrap_lock( & th->th.th_local.bget_lock );
            #endif /* USE_QUEUING_LOCK_FOR_BGET */

             p = (void *) th->th.th_local.bget_list;
             th->th.th_local.bget_list = 0;

            #ifdef USE_QUEUING_LOCK_FOR_BGET
                __kmp_release_lock( & th->th.th_local.bget_lock,
                                    __kmp_gtid_from_thread(th) );
            #else
                __kmp_release_bootstrap_lock( & th->th.th_local.bget_lock );
            #endif
        #endif /* USE_CMP_XCHG_FOR_BGET */

        /* Check again to make sure the list is not empty */

        while (p != 0) {
            void *buf = p;
            bfhead_t *b = BFH(((char *) p) - sizeof(bhead_t));

            KMP_DEBUG_ASSERT( b->bh.bb.bsize != 0 );
            KMP_DEBUG_ASSERT( ( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ) ==
                                (kmp_uintptr_t)th ); // clear possible mark
            KMP_DEBUG_ASSERT( b->ql.blink == 0 );

            p = (void *) b->ql.flink;

            brel( th, buf );
        }
    }
}

/* Chain together the free buffers by using the thread owner field */

static void
__kmp_bget_enqueue( kmp_info_t *th, void *buf
#ifdef USE_QUEUING_LOCK_FOR_BGET
                    , kmp_int32 rel_gtid
#endif
                  )
{
    bfhead_t *b = BFH(((char *) buf) - sizeof(bhead_t));

    KMP_DEBUG_ASSERT( b->bh.bb.bsize != 0 );
    KMP_DEBUG_ASSERT( ( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ) ==
                        (kmp_uintptr_t)th ); // clear possible mark

    b->ql.blink = 0;

    KC_TRACE( 10, ( "__kmp_bget_enqueue: moving buffer to T#%d list\n",
                    __kmp_gtid_from_thread( th ) ) );

#if USE_CMP_XCHG_FOR_BGET
    {
        volatile void *old_value = TCR_PTR(th->th.th_local.bget_list);
        /* the next pointer must be set before setting bget_list to buf to avoid
           exposing a broken list to other threads, even for an instant. */
        b->ql.flink = BFH( old_value );

        while ( ! KMP_COMPARE_AND_STORE_PTR(
            & th->th.th_local.bget_list, old_value, buf ) )
        {
            KMP_CPU_PAUSE();
            old_value = TCR_PTR(th->th.th_local.bget_list);
            /* the next pointer must be set before setting bget_list to buf to avoid
               exposing a broken list to other threads, even for an instant. */
            b->ql.flink = BFH( old_value );
        }
    }
#else /* ! USE_CMP_XCHG_FOR_BGET */
# ifdef USE_QUEUING_LOCK_FOR_BGET
    __kmp_acquire_lock( & th->th.th_local.bget_lock, rel_gtid );
# else
    __kmp_acquire_bootstrap_lock( & th->th.th_local.bget_lock );
 # endif

    b->ql.flink = BFH( th->th.th_local.bget_list );
    th->th.th_local.bget_list = (void *) buf;

# ifdef USE_QUEUING_LOCK_FOR_BGET
    __kmp_release_lock( & th->th.th_local.bget_lock, rel_gtid );
# else
    __kmp_release_bootstrap_lock( & th->th.th_local.bget_lock );
# endif
#endif /* USE_CMP_XCHG_FOR_BGET */
}

/* insert buffer back onto a new freelist */

static void
__kmp_bget_insert_into_freelist( thr_data_t *thr, bfhead_t *b )
{
    int bin;

    KMP_DEBUG_ASSERT( ((size_t)b ) % SizeQuant == 0 );
    KMP_DEBUG_ASSERT( b->bh.bb.bsize % SizeQuant == 0 );

    bin = bget_get_bin( b->bh.bb.bsize );

    KMP_DEBUG_ASSERT(thr->freelist[ bin ].ql.blink->ql.flink == &thr->freelist[ bin ]);
    KMP_DEBUG_ASSERT(thr->freelist[ bin ].ql.flink->ql.blink == &thr->freelist[ bin ]);

    b->ql.flink = &thr->freelist[ bin ];
    b->ql.blink = thr->freelist[ bin ].ql.blink;

    thr->freelist[ bin ].ql.blink = b;
    b->ql.blink->ql.flink = b;
}

/* unlink the buffer from the old freelist */

static void
__kmp_bget_remove_from_freelist( bfhead_t *b )
{
    KMP_DEBUG_ASSERT(b->ql.blink->ql.flink == b);
    KMP_DEBUG_ASSERT(b->ql.flink->ql.blink == b);

    b->ql.blink->ql.flink = b->ql.flink;
    b->ql.flink->ql.blink = b->ql.blink;
}

/* ------------------------------------------------------------------------ */

/*  GET STATS -- check info on free list */

static void
bcheck(  kmp_info_t *th, bufsize *max_free, bufsize *total_free )
{
    thr_data_t *thr = get_thr_data( th );
    int bin;

    *total_free = *max_free = 0;

    for (bin = 0; bin < MAX_BGET_BINS; ++bin) {
        bfhead_t *b, *best;

        best = &thr->freelist[ bin ];
        b = best->ql.flink;

        while (b != &thr->freelist[ bin ]) {
            *total_free += (b->bh.bb.bsize - sizeof( bhead_t ));
            if ((best == &thr->freelist[ bin ]) || (b->bh.bb.bsize < best->bh.bb.bsize))
                best = b;

            /* Link to next buffer */
            b = b->ql.flink;
        }

        if (*max_free < best->bh.bb.bsize)
            *max_free = best->bh.bb.bsize;
    }

    if (*max_free > (bufsize)sizeof( bhead_t ))
        *max_free -= sizeof( bhead_t );
}

/* ------------------------------------------------------------------------ */

/*  BGET  --  Allocate a buffer.  */

static void *
bget(  kmp_info_t *th, bufsize requested_size )
{
    thr_data_t *thr = get_thr_data( th );
    bufsize size = requested_size;
    bfhead_t *b;
    void *buf;
    int compactseq = 0;
    int use_blink = 0;
/* For BestFit */
    bfhead_t *best;

    if ( size < 0 || size + sizeof( bhead_t ) > MaxSize ) {
        return NULL;
    }; // if

    __kmp_bget_dequeue( th );         /* Release any queued buffers */

    if (size < (bufsize)SizeQ) {      /* Need at least room for the */
        size = SizeQ;                 /*    queue links.  */
    }
    #if defined( SizeQuant ) && ( SizeQuant > 1 )
        size = (size + (SizeQuant - 1)) & (~(SizeQuant - 1));
    #endif

    size += sizeof(bhead_t);     /* Add overhead in allocated buffer
                                         to size required. */
    KMP_DEBUG_ASSERT( size >= 0 );
    KMP_DEBUG_ASSERT( size % SizeQuant == 0 );

    use_blink = ( thr->mode == bget_mode_lifo );

    /* If a compact function was provided in the call to bectl(), wrap
       a loop around the allocation process  to  allow  compaction  to
       intervene in case we don't find a suitable buffer in the chain. */

    for (;;) {
        int bin;

        for (bin = bget_get_bin( size ); bin < MAX_BGET_BINS; ++bin) {
            /* Link to next buffer */
            b = ( use_blink ? thr->freelist[ bin ].ql.blink : thr->freelist[ bin ].ql.flink );

            if (thr->mode == bget_mode_best) {
                best = &thr->freelist[ bin ];

                /* Scan the free list searching for the first buffer big enough
                   to hold the requested size buffer. */

                while (b != &thr->freelist[ bin ]) {
                    if (b->bh.bb.bsize >= (bufsize) size) {
                        if ((best == &thr->freelist[ bin ]) || (b->bh.bb.bsize < best->bh.bb.bsize)) {
                            best = b;
                        }
                    }

                    /* Link to next buffer */
                    b = ( use_blink ? b->ql.blink : b->ql.flink );
                }
                b = best;
            }

            while (b != &thr->freelist[ bin ]) {
                if ((bufsize) b->bh.bb.bsize >= (bufsize) size) {

                    /* Buffer  is big enough to satisfy  the request.  Allocate it
                       to the caller.  We must decide whether the buffer is  large
                       enough  to  split  into  the part given to the caller and a
                       free buffer that remains on the free list, or  whether  the
                       entire  buffer  should  be  removed  from the free list and
                       given to the caller in its entirety.   We  only  split  the
                       buffer if enough room remains for a header plus the minimum
                       quantum of allocation. */

                    if ((b->bh.bb.bsize - (bufsize) size) > (bufsize)(SizeQ + (sizeof(bhead_t)))) {
                        bhead_t *ba, *bn;

                        ba = BH(((char *) b) + (b->bh.bb.bsize - (bufsize) size));
                        bn = BH(((char *) ba) + size);

                        KMP_DEBUG_ASSERT(bn->bb.prevfree == b->bh.bb.bsize);

                        /* Subtract size from length of free block. */
                        b->bh.bb.bsize -= (bufsize) size;

                        /* Link allocated buffer to the previous free buffer. */
                        ba->bb.prevfree = b->bh.bb.bsize;

                        /* Plug negative size into user buffer. */
                        ba->bb.bsize = -size;

                        /* Mark this buffer as owned by this thread. */
                        TCW_PTR(ba->bb.bthr, th);   // not an allocated address (do not mark it)
                        /* Mark buffer after this one not preceded by free block. */
                        bn->bb.prevfree = 0;

                        /* unlink the buffer from the old freelist, and reinsert it into the new freelist */
                        __kmp_bget_remove_from_freelist( b );
                        __kmp_bget_insert_into_freelist( thr, b );
#if BufStats
                        thr->totalloc += (size_t) size;
                        thr->numget++;        /* Increment number of bget() calls */
#endif
                        buf = (void *) ((((char *) ba) + sizeof(bhead_t)));
                        KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 );
                        return buf;
                    } else {
                        bhead_t *ba;

                        ba = BH(((char *) b) + b->bh.bb.bsize);

                        KMP_DEBUG_ASSERT(ba->bb.prevfree == b->bh.bb.bsize);

                        /* The buffer isn't big enough to split.  Give  the  whole
                           shebang to the caller and remove it from the free list. */

                       __kmp_bget_remove_from_freelist( b );
#if BufStats
                        thr->totalloc += (size_t) b->bh.bb.bsize;
                        thr->numget++;        /* Increment number of bget() calls */
#endif
                        /* Negate size to mark buffer allocated. */
                        b->bh.bb.bsize = -(b->bh.bb.bsize);

                        /* Mark this buffer as owned by this thread. */
                        TCW_PTR(ba->bb.bthr, th);   // not an allocated address (do not mark it)
                        /* Zero the back pointer in the next buffer in memory
                           to indicate that this buffer is allocated. */
                        ba->bb.prevfree = 0;

                        /* Give user buffer starting at queue links. */
                        buf =  (void *) &(b->ql);
                        KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 );
                        return buf;
                    }
                }

                /* Link to next buffer */
                b = ( use_blink ? b->ql.blink : b->ql.flink );
            }
        }

        /* We failed to find a buffer.  If there's a compact  function
           defined,  notify  it  of the size requested.  If it returns
           TRUE, try the allocation again. */

        if ((thr->compfcn == 0) || (!(*thr->compfcn)(size, ++compactseq))) {
            break;
        }
    }

    /* No buffer available with requested size free. */

    /* Don't give up yet -- look in the reserve supply. */

    if (thr->acqfcn != 0) {
        if (size > (bufsize) (thr->exp_incr - sizeof(bhead_t))) {

            /* Request  is  too  large  to  fit in a single expansion
               block.  Try to satisy it by a direct buffer acquisition. */

            bdhead_t *bdh;

            size += sizeof(bdhead_t) - sizeof(bhead_t);

            KE_TRACE( 10, ("%%%%%% MALLOC( %d )\n", (int) size ) );

            /* richryan */
            bdh = BDH((*thr->acqfcn)((bufsize) size));
            if (bdh != NULL) {

                /*  Mark the buffer special by setting the size field
                    of its header to zero.  */
                bdh->bh.bb.bsize = 0;

                /* Mark this buffer as owned by this thread. */
                TCW_PTR(bdh->bh.bb.bthr, th);  // don't mark buffer as allocated,
                                               // because direct buffer never goes to free list
                bdh->bh.bb.prevfree = 0;
                bdh->tsize = size;
#if BufStats
                thr->totalloc += (size_t) size;
                thr->numget++;        /* Increment number of bget() calls */
                thr->numdget++;       /* Direct bget() call count */
#endif
                buf =  (void *) (bdh + 1);
                KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 );
                return buf;
            }

        } else {

            /*  Try to obtain a new expansion block */

            void *newpool;

            KE_TRACE( 10, ("%%%%%% MALLOCB( %d )\n", (int) thr->exp_incr ) );

            /* richryan */
            newpool = (*thr->acqfcn)((bufsize) thr->exp_incr);
            KMP_DEBUG_ASSERT( ((size_t)newpool) % SizeQuant == 0 );
            if (newpool != NULL) {
                bpool( th, newpool, thr->exp_incr);
                buf =  bget( th, requested_size);  /* This can't, I say, can't get into a loop. */
                return buf;
            }
        }
    }

    /*  Still no buffer available */

    return NULL;
}

/*  BGETZ  --  Allocate a buffer and clear its contents to zero.  We clear
               the  entire  contents  of  the buffer to zero, not just the
               region requested by the caller. */

static void *
bgetz(  kmp_info_t *th, bufsize size )
{
    char *buf = (char *) bget( th, size);

    if (buf != NULL) {
        bhead_t *b;
        bufsize rsize;

        b = BH(buf - sizeof(bhead_t));
        rsize = -(b->bb.bsize);
        if (rsize == 0) {
            bdhead_t *bd;

            bd = BDH(buf - sizeof(bdhead_t));
            rsize = bd->tsize - (bufsize) sizeof(bdhead_t);
        } else {
            rsize -= sizeof(bhead_t);
        }

        KMP_DEBUG_ASSERT(rsize >= size);

        (void) memset(buf, 0, (bufsize) rsize);
    }
    return ((void *) buf);
}

/*  BGETR  --  Reallocate a buffer.  This is a minimal implementation,
               simply in terms of brel()  and  bget().   It  could  be
               enhanced to allow the buffer to grow into adjacent free
               blocks and to avoid moving data unnecessarily.  */

static void *
bgetr(  kmp_info_t *th, void *buf, bufsize size)
{
    void *nbuf;
    bufsize osize;                    /* Old size of buffer */
    bhead_t *b;

    nbuf = bget( th, size );
    if ( nbuf == NULL ) { /* Acquire new buffer */
        return NULL;
    }
    if ( buf == NULL ) {
        return nbuf;
    }
    b = BH(((char *) buf) - sizeof(bhead_t));
    osize = -b->bb.bsize;
    if (osize == 0) {
        /*  Buffer acquired directly through acqfcn. */
        bdhead_t *bd;

        bd = BDH(((char *) buf) - sizeof(bdhead_t));
        osize = bd->tsize - (bufsize) sizeof(bdhead_t);
    } else {
        osize -= sizeof(bhead_t);
    };

    KMP_DEBUG_ASSERT(osize > 0);

    (void) KMP_MEMCPY((char *) nbuf, (char *) buf, /* Copy the data */
             (size_t) ((size < osize) ? size : osize));
    brel( th, buf );

    return nbuf;
}

/*  BREL  --  Release a buffer.  */

static void
brel(  kmp_info_t *th, void *buf )
{
    thr_data_t *thr = get_thr_data( th );
    bfhead_t *b, *bn;
    kmp_info_t *bth;

    KMP_DEBUG_ASSERT(buf != NULL);
    KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 );

    b = BFH(((char *) buf) - sizeof(bhead_t));

    if (b->bh.bb.bsize == 0) {        /* Directly-acquired buffer? */
        bdhead_t *bdh;

        bdh = BDH(((char *) buf) - sizeof(bdhead_t));
        KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0);
#if BufStats
        thr->totalloc -= (size_t) bdh->tsize;
        thr->numdrel++;               /* Number of direct releases */
        thr->numrel++;                /* Increment number of brel() calls */
#endif /* BufStats */
#ifdef FreeWipe
        (void) memset((char *) buf, 0x55,
                 (size_t) (bdh->tsize - sizeof(bdhead_t)));
#endif /* FreeWipe */

        KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) bdh ) );

        KMP_DEBUG_ASSERT( thr->relfcn != 0 );
        (*thr->relfcn)((void *) bdh);      /* Release it directly. */
        return;
    }

    bth = (kmp_info_t *)( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ); // clear possible mark before comparison
    if ( bth != th ) {
        /* Add this buffer to be released by the owning thread later */
        __kmp_bget_enqueue( bth, buf
#ifdef USE_QUEUING_LOCK_FOR_BGET
                            , __kmp_gtid_from_thread( th )
#endif
        );
        return;
    }

    /* Buffer size must be negative, indicating that the buffer is
       allocated. */

    if (b->bh.bb.bsize >= 0) {
        bn = NULL;
    }
    KMP_DEBUG_ASSERT(b->bh.bb.bsize < 0);

    /*  Back pointer in next buffer must be zero, indicating the
        same thing: */

    KMP_DEBUG_ASSERT(BH((char *) b - b->bh.bb.bsize)->bb.prevfree == 0);

#if BufStats
    thr->numrel++;                    /* Increment number of brel() calls */
    thr->totalloc += (size_t) b->bh.bb.bsize;
#endif

    /* If the back link is nonzero, the previous buffer is free.  */

    if (b->bh.bb.prevfree != 0) {
        /* The previous buffer is free.  Consolidate this buffer  with  it
           by  adding  the  length  of  this  buffer  to the previous free
           buffer.  Note that we subtract the size  in  the  buffer  being
           released,  since  it's  negative to indicate that the buffer is
           allocated. */

        register bufsize size = b->bh.bb.bsize;

        /* Make the previous buffer the one we're working on. */
        KMP_DEBUG_ASSERT(BH((char *) b - b->bh.bb.prevfree)->bb.bsize == b->bh.bb.prevfree);
        b = BFH(((char *) b) - b->bh.bb.prevfree);
        b->bh.bb.bsize -= size;

        /* unlink the buffer from the old freelist */
        __kmp_bget_remove_from_freelist( b );
    }
    else {
        /* The previous buffer isn't allocated.  Mark this buffer
           size as positive (i.e. free) and fall through to place
           the buffer on the free list as an isolated free block. */

        b->bh.bb.bsize = -b->bh.bb.bsize;
    }

    /* insert buffer back onto a new freelist */
    __kmp_bget_insert_into_freelist( thr, b );


    /* Now we look at the next buffer in memory, located by advancing from
       the  start  of  this  buffer  by its size, to see if that buffer is
       free.  If it is, we combine  this  buffer  with  the  next  one  in
       memory, dechaining the second buffer from the free list. */

    bn =  BFH(((char *) b) + b->bh.bb.bsize);
    if (bn->bh.bb.bsize > 0) {

        /* The buffer is free.  Remove it from the free list and add
           its size to that of our buffer. */

        KMP_DEBUG_ASSERT(BH((char *) bn + bn->bh.bb.bsize)->bb.prevfree == bn->bh.bb.bsize);

        __kmp_bget_remove_from_freelist( bn );

        b->bh.bb.bsize += bn->bh.bb.bsize;

        /* unlink the buffer from the old freelist, and reinsert it into the new freelist */

        __kmp_bget_remove_from_freelist( b );
        __kmp_bget_insert_into_freelist( thr, b );

        /* Finally,  advance  to   the  buffer  that   follows  the  newly
           consolidated free block.  We must set its  backpointer  to  the
           head  of  the  consolidated free block.  We know the next block
           must be an allocated block because the process of recombination
           guarantees  that  two  free  blocks will never be contiguous in
           memory.  */

        bn = BFH(((char *) b) + b->bh.bb.bsize);
    }
#ifdef FreeWipe
    (void) memset(((char *) b) + sizeof(bfhead_t), 0x55,
            (size_t) (b->bh.bb.bsize - sizeof(bfhead_t)));
#endif
    KMP_DEBUG_ASSERT(bn->bh.bb.bsize < 0);

    /* The next buffer is allocated.  Set the backpointer in it  to  point
       to this buffer; the previous free buffer in memory. */

    bn->bh.bb.prevfree = b->bh.bb.bsize;

    /*  If  a  block-release function is defined, and this free buffer
        constitutes the entire block, release it.  Note that  pool_len
        is  defined  in  such a way that the test will fail unless all
        pool blocks are the same size.  */

    if (thr->relfcn != 0 &&
        b->bh.bb.bsize == (bufsize)(thr->pool_len - sizeof(bhead_t)))
    {
#if BufStats
        if (thr->numpblk != 1) {        /* Do not release the last buffer until finalization time */
#endif

            KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0);
            KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.bsize == ESent);
            KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.prevfree == b->bh.bb.bsize);

            /*  Unlink the buffer from the free list  */
            __kmp_bget_remove_from_freelist( b );

            KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) b ) );

            (*thr->relfcn)(b);
#if BufStats
            thr->numprel++;               /* Nr of expansion block releases */
            thr->numpblk--;               /* Total number of blocks */
            KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel);

            /* avoid leaving stale last_pool pointer around if it is being dealloced */
            if (thr->last_pool == b) thr->last_pool = 0;
        }
        else {
            thr->last_pool = b;
        }
#endif /* BufStats */
    }
}

/*  BECTL  --  Establish automatic pool expansion control  */

static void
bectl(  kmp_info_t *th, bget_compact_t compact, bget_acquire_t acquire, bget_release_t release, bufsize pool_incr)
{
    thr_data_t *thr = get_thr_data( th );

    thr->compfcn = compact;
    thr->acqfcn = acquire;
    thr->relfcn = release;
    thr->exp_incr = pool_incr;
}

/*  BPOOL  --  Add a region of memory to the buffer pool.  */

static void
bpool(  kmp_info_t *th, void *buf, bufsize len)
{
/*    int bin = 0; */
    thr_data_t *thr = get_thr_data( th );
    bfhead_t *b = BFH(buf);
    bhead_t *bn;

    __kmp_bget_dequeue( th );         /* Release any queued buffers */

#ifdef SizeQuant
    len &= ~(SizeQuant - 1);
#endif
    if (thr->pool_len == 0) {
        thr->pool_len = len;
    } else if (len != thr->pool_len) {
        thr->pool_len = -1;
    }
#if BufStats
    thr->numpget++;                   /* Number of block acquisitions */
    thr->numpblk++;                   /* Number of blocks total */
    KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel);
#endif /* BufStats */

    /* Since the block is initially occupied by a single free  buffer,
       it  had  better  not  be  (much) larger than the largest buffer
       whose size we can store in bhead.bb.bsize. */

    KMP_DEBUG_ASSERT(len - sizeof(bhead_t) <= -((bufsize) ESent + 1));

    /* Clear  the  backpointer at  the start of the block to indicate that
       there  is  no  free  block  prior  to  this   one.    That   blocks
       recombination when the first block in memory is released. */

    b->bh.bb.prevfree = 0;

    /* Create a dummy allocated buffer at the end of the pool.  This dummy
       buffer is seen when a buffer at the end of the pool is released and
       blocks  recombination  of  the last buffer with the dummy buffer at
       the end.  The length in the dummy buffer  is  set  to  the  largest
       negative  number  to  denote  the  end  of  the pool for diagnostic
       routines (this specific value is  not  counted  on  by  the  actual
       allocation and release functions). */

    len -= sizeof(bhead_t);
    b->bh.bb.bsize = (bufsize) len;
    /* Set the owner of this buffer */
    TCW_PTR( b->bh.bb.bthr, (kmp_info_t*)((kmp_uintptr_t)th | 1) ); // mark the buffer as allocated address

    /* Chain the new block to the free list. */
    __kmp_bget_insert_into_freelist( thr, b );

#ifdef FreeWipe
    (void) memset(((char *) b) + sizeof(bfhead_t), 0x55,
             (size_t) (len - sizeof(bfhead_t)));
#endif
    bn = BH(((char *) b) + len);
    bn->bb.prevfree = (bufsize) len;
    /* Definition of ESent assumes two's complement! */
    KMP_DEBUG_ASSERT( (~0) == -1 && (bn != 0) );

    bn->bb.bsize = ESent;
}

/* ------------------------------------------------------------------------ */

/*  BFREED  --  Dump the free lists for this thread. */

static void
bfreed(  kmp_info_t *th )
{
    int bin = 0, count = 0;
    int gtid = __kmp_gtid_from_thread( th );
    thr_data_t *thr = get_thr_data( th );

#if BufStats
    __kmp_printf_no_lock("__kmp_printpool: T#%d total=%" KMP_UINT64_SPEC " get=%" KMP_INT64_SPEC " rel=%" \
           KMP_INT64_SPEC " pblk=%" KMP_INT64_SPEC " pget=%" KMP_INT64_SPEC " prel=%" KMP_INT64_SPEC \
           " dget=%" KMP_INT64_SPEC " drel=%" KMP_INT64_SPEC "\n",
           gtid, (kmp_uint64) thr->totalloc,
           (kmp_int64) thr->numget,  (kmp_int64) thr->numrel,
           (kmp_int64) thr->numpblk,
           (kmp_int64) thr->numpget, (kmp_int64) thr->numprel,
           (kmp_int64) thr->numdget, (kmp_int64) thr->numdrel );
#endif

    for (bin = 0; bin < MAX_BGET_BINS; ++bin) {
        bfhead_t *b;

        for (b = thr->freelist[ bin ].ql.flink; b != &thr->freelist[ bin ]; b = b->ql.flink) {
            bufsize bs = b->bh.bb.bsize;

            KMP_DEBUG_ASSERT( b->ql.blink->ql.flink == b );
            KMP_DEBUG_ASSERT( b->ql.flink->ql.blink == b );
            KMP_DEBUG_ASSERT( bs > 0 );

            count += 1;

            __kmp_printf_no_lock("__kmp_printpool: T#%d Free block: 0x%p size %6ld bytes.\n", gtid, b, (long) bs );
#ifdef FreeWipe
            {
                char *lerr = ((char *) b) + sizeof(bfhead_t);
                if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) || (memcmp(lerr, lerr + 1, (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) {
                    __kmp_printf_no_lock( "__kmp_printpool: T#%d     (Contents of above free block have been overstored.)\n", gtid );
                }
            }
#endif
        }
    }

    if (count == 0)
        __kmp_printf_no_lock("__kmp_printpool: T#%d No free blocks\n", gtid );
}

/* ------------------------------------------------------------------------ */

#ifdef KMP_DEBUG

#if BufStats

/*  BSTATS  --  Return buffer allocation free space statistics.  */

static void
bstats(  kmp_info_t *th, bufsize *curalloc,  bufsize *totfree,  bufsize *maxfree, long *nget, long *nrel)
{
    int bin = 0;
    thr_data_t *thr = get_thr_data( th );

    *nget = thr->numget;
    *nrel = thr->numrel;
    *curalloc = (bufsize) thr->totalloc;
    *totfree = 0;
    *maxfree = -1;

    for (bin = 0; bin < MAX_BGET_BINS; ++bin) {
        bfhead_t *b = thr->freelist[ bin ].ql.flink;

        while (b != &thr->freelist[ bin ]) {
            KMP_DEBUG_ASSERT(b->bh.bb.bsize > 0);
            *totfree += b->bh.bb.bsize;
            if (b->bh.bb.bsize > *maxfree) {
                *maxfree = b->bh.bb.bsize;
            }
            b = b->ql.flink;              /* Link to next buffer */
        }
    }
}

/*  BSTATSE  --  Return extended statistics  */

static void
bstatse(  kmp_info_t *th, bufsize *pool_incr, long *npool, long *npget, long *nprel, long *ndget, long *ndrel)
{
    thr_data_t *thr = get_thr_data( th );

    *pool_incr = (thr->pool_len < 0) ? -thr->exp_incr : thr->exp_incr;
    *npool = thr->numpblk;
    *npget = thr->numpget;
    *nprel = thr->numprel;
    *ndget = thr->numdget;
    *ndrel = thr->numdrel;
}

#endif /* BufStats */

/*  BUFDUMP  --  Dump the data in a buffer.  This is called with the  user
                 data pointer, and backs up to the buffer header.  It will
                 dump either a free block or an allocated one.  */

static void
bufdump(  kmp_info_t *th, void *buf )
{
    bfhead_t *b;
    unsigned char *bdump;
    bufsize bdlen;

    b = BFH(((char *) buf) - sizeof(bhead_t));
    KMP_DEBUG_ASSERT(b->bh.bb.bsize != 0);
    if (b->bh.bb.bsize < 0) {
        bdump = (unsigned char *) buf;
        bdlen = (-b->bh.bb.bsize) - (bufsize) sizeof(bhead_t);
    } else {
        bdump = (unsigned char *) (((char *) b) + sizeof(bfhead_t));
        bdlen = b->bh.bb.bsize - (bufsize) sizeof(bfhead_t);
    }

    while (bdlen > 0) {
        int i, dupes = 0;
        bufsize l = bdlen;
        char bhex[50], bascii[20];

        if (l > 16) {
            l = 16;
        }

        for (i = 0; i < l; i++) {
            (void) KMP_SNPRINTF(bhex + i * 3, sizeof(bhex), "%02X ", bdump[i]);
            if (bdump[i] > 0x20 && bdump[i] < 0x7F)
                bascii[ i ] = bdump[ i ];
            else
                bascii[ i ] = ' ';
        }
        bascii[i] = 0;
        (void) __kmp_printf_no_lock("%-48s   %s\n", bhex, bascii);
        bdump += l;
        bdlen -= l;
        while ((bdlen > 16) && (memcmp((char *) (bdump - 16),
                                       (char *) bdump, 16) == 0)) {
            dupes++;
            bdump += 16;
            bdlen -= 16;
        }
        if (dupes > 1) {
            (void) __kmp_printf_no_lock(
                "     (%d lines [%d bytes] identical to above line skipped)\n",
                dupes, dupes * 16);
        } else if (dupes == 1) {
            bdump -= 16;
            bdlen += 16;
        }
    }
}

/*  BPOOLD  --  Dump a buffer pool.  The buffer headers are always listed.
                If DUMPALLOC is nonzero, the contents of allocated buffers
                are  dumped.   If  DUMPFREE  is  nonzero,  free blocks are
                dumped as well.  If FreeWipe  checking  is  enabled,  free
                blocks  which  have  been clobbered will always be dumped. */

static void
bpoold(  kmp_info_t *th, void *buf, int dumpalloc, int dumpfree)
{
    bfhead_t *b = BFH( (char*)buf - sizeof(bhead_t));

    while (b->bh.bb.bsize != ESent) {
        bufsize bs = b->bh.bb.bsize;

        if (bs < 0) {
            bs = -bs;
            (void) __kmp_printf_no_lock("Allocated buffer: size %6ld bytes.\n", (long) bs);
            if (dumpalloc) {
                bufdump( th, (void *) (((char *) b) + sizeof(bhead_t)));
            }
        } else {
            const char *lerr = "";

            KMP_DEBUG_ASSERT(bs > 0);
            if ((b->ql.blink->ql.flink != b) || (b->ql.flink->ql.blink != b)) {
                lerr = "  (Bad free list links)";
            }
            (void) __kmp_printf_no_lock("Free block:       size %6ld bytes.%s\n",
                (long) bs, lerr);
#ifdef FreeWipe
            lerr = ((char *) b) + sizeof(bfhead_t);
            if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) ||
                (memcmp(lerr, lerr + 1,
                  (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) {
                (void) __kmp_printf_no_lock(
                    "(Contents of above free block have been overstored.)\n");
                bufdump( th, (void *) (((char *) b) + sizeof(bhead_t)));
            } else
#endif
            if (dumpfree) {
                bufdump( th, (void *) (((char *) b) + sizeof(bhead_t)));
            }
        }
        b = BFH(((char *) b) + bs);
    }
}

/*  BPOOLV  --  Validate a buffer pool. */

static int
bpoolv(  kmp_info_t *th, void *buf )
{
    bfhead_t *b = BFH(buf);

    while (b->bh.bb.bsize != ESent) {
        bufsize bs = b->bh.bb.bsize;

        if (bs < 0) {
            bs = -bs;
        } else {
#ifdef FreeWipe
            char *lerr = "";
#endif

            KMP_DEBUG_ASSERT(bs > 0);
            if (bs <= 0) {
                return 0;
            }
            if ((b->ql.blink->ql.flink != b) || (b->ql.flink->ql.blink != b)) {
                (void) __kmp_printf_no_lock("Free block: size %6ld bytes.  (Bad free list links)\n",
                     (long) bs);
                KMP_DEBUG_ASSERT(0);
                return 0;
            }
#ifdef FreeWipe
            lerr = ((char *) b) + sizeof(bfhead_t);
            if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) ||
                (memcmp(lerr, lerr + 1,
                  (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) {
                (void) __kmp_printf_no_lock(
                    "(Contents of above free block have been overstored.)\n");
                bufdump( th, (void *) (((char *) b) + sizeof(bhead_t)));
                KMP_DEBUG_ASSERT(0);
                return 0;
            }
#endif /* FreeWipe */
        }
        b = BFH(((char *) b) + bs);
    }
    return 1;
}

#endif /* KMP_DEBUG */

/* ------------------------------------------------------------------------ */

void
__kmp_initialize_bget( kmp_info_t *th )
{
    KMP_DEBUG_ASSERT( SizeQuant >= sizeof( void * ) && (th != 0) );

    set_thr_data( th );

    bectl( th, (bget_compact_t) 0, (bget_acquire_t) malloc, (bget_release_t) free,
           (bufsize) __kmp_malloc_pool_incr );
}

void
__kmp_finalize_bget( kmp_info_t *th )
{
    thr_data_t *thr;
    bfhead_t *b;

    KMP_DEBUG_ASSERT( th != 0 );

#if BufStats
    thr = (thr_data_t *) th->th.th_local.bget_data;
    KMP_DEBUG_ASSERT( thr != NULL );
    b = thr->last_pool;

    /*  If  a  block-release function is defined, and this free buffer
        constitutes the entire block, release it.  Note that  pool_len
        is  defined  in  such a way that the test will fail unless all
        pool blocks are the same size.  */

    /* Deallocate the last pool if one exists because we no longer do it in brel() */
    if (thr->relfcn != 0 && b != 0 && thr->numpblk != 0 &&
        b->bh.bb.bsize == (bufsize)(thr->pool_len - sizeof(bhead_t)))
    {
        KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0);
        KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.bsize == ESent);
        KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.prevfree == b->bh.bb.bsize);

        /*  Unlink the buffer from the free list  */
        __kmp_bget_remove_from_freelist( b );

        KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) b ) );

        (*thr->relfcn)(b);
        thr->numprel++;               /* Nr of expansion block releases */
        thr->numpblk--;               /* Total number of blocks */
        KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel);
    }
#endif /* BufStats */

    /* Deallocate bget_data */
    if ( th->th.th_local.bget_data != NULL ) {
        __kmp_free( th->th.th_local.bget_data );
        th->th.th_local.bget_data = NULL;
    }; // if
}

void
kmpc_set_poolsize( size_t size )
{
    bectl( __kmp_get_thread(), (bget_compact_t) 0, (bget_acquire_t) malloc,
           (bget_release_t) free, (bufsize) size );
}

size_t
kmpc_get_poolsize( void )
{
    thr_data_t *p;

    p = get_thr_data( __kmp_get_thread() );

    return p->exp_incr;
}

void
kmpc_set_poolmode( int mode )
{
    thr_data_t *p;

    if (mode == bget_mode_fifo || mode == bget_mode_lifo || mode == bget_mode_best) {
        p = get_thr_data( __kmp_get_thread() );
        p->mode = (bget_mode_t) mode;
    }
}

int
kmpc_get_poolmode( void )
{
    thr_data_t *p;

    p = get_thr_data( __kmp_get_thread() );

    return p->mode;
}

void
kmpc_get_poolstat( size_t *maxmem, size_t *allmem )
{
    kmp_info_t *th = __kmp_get_thread();
    bufsize a, b;

    __kmp_bget_dequeue( th );         /* Release any queued buffers */

    bcheck( th, &a, &b );

    *maxmem = a;
    *allmem = b;
}

void
kmpc_poolprint( void )
{
    kmp_info_t *th = __kmp_get_thread();

    __kmp_bget_dequeue( th );         /* Release any queued buffers */

    bfreed( th );
}

#endif // #if KMP_USE_BGET

/* ------------------------------------------------------------------------ */

void *
kmpc_malloc( size_t size )
{
    void * ptr;
        ptr = bget( __kmp_entry_thread(), (bufsize) size );

    return ptr;
}

void *
kmpc_calloc( size_t nelem, size_t elsize )
{
    void * ptr;
        ptr = bgetz( __kmp_entry_thread(), (bufsize) (nelem * elsize) );

    return ptr;
}

void *
kmpc_realloc( void * ptr, size_t size )
{
    void * result = NULL;

        if ( ptr == NULL ) {
            // If pointer is NULL, realloc behaves like malloc.
            result = bget( __kmp_entry_thread(), (bufsize) size );
        } else if ( size == 0 ) {
            // If size is 0, realloc behaves like free.
            // The thread must be registered by the call to kmpc_malloc() or kmpc_calloc() before.
            // So it should be safe to call __kmp_get_thread(), not __kmp_entry_thread().
            brel( __kmp_get_thread(), ptr );
        } else {
            result = bgetr( __kmp_entry_thread(), ptr, (bufsize) size );
        }; // if

    return result;
}

/* NOTE: the library must have already been initialized by a previous allocate */

void
kmpc_free( void * ptr )
{
    if ( ! __kmp_init_serial ) {
        return;
    }; // if
    if ( ptr != NULL ) {
            kmp_info_t *th = __kmp_get_thread();
            __kmp_bget_dequeue( th );         /* Release any queued buffers */
            brel( th, ptr );
    };
}


/* ------------------------------------------------------------------------ */

void *
___kmp_thread_malloc( kmp_info_t *th, size_t size KMP_SRC_LOC_DECL )
{
    void * ptr;
    KE_TRACE( 30, (
        "-> __kmp_thread_malloc( %p, %d ) called from %s:%d\n",
        th,
        (int) size
        KMP_SRC_LOC_PARM
    ) );
        ptr = bget( th, (bufsize) size );
    KE_TRACE( 30, ( "<- __kmp_thread_malloc() returns %p\n", ptr ) );
    return ptr;
}

void *
___kmp_thread_calloc( kmp_info_t *th, size_t nelem, size_t elsize KMP_SRC_LOC_DECL )
{
    void * ptr;
    KE_TRACE( 30, (
        "-> __kmp_thread_calloc( %p, %d, %d ) called from %s:%d\n",
        th,
        (int) nelem,
        (int) elsize
        KMP_SRC_LOC_PARM
    ) );
        ptr = bgetz( th, (bufsize) (nelem * elsize) );
    KE_TRACE( 30, ( "<- __kmp_thread_calloc() returns %p\n", ptr ) );
    return ptr;
}

void *
___kmp_thread_realloc( kmp_info_t *th, void *ptr, size_t size KMP_SRC_LOC_DECL )
{
    KE_TRACE( 30, (
        "-> __kmp_thread_realloc( %p, %p, %d ) called from %s:%d\n",
        th,
        ptr,
        (int) size
        KMP_SRC_LOC_PARM
    ) );
        ptr = bgetr( th, ptr, (bufsize) size );
    KE_TRACE( 30, ( "<- __kmp_thread_realloc() returns %p\n", ptr ) );
    return ptr;
}

void
___kmp_thread_free( kmp_info_t *th, void *ptr KMP_SRC_LOC_DECL )
{
    KE_TRACE( 30, (
        "-> __kmp_thread_free( %p, %p ) called from %s:%d\n",
        th,
        ptr
        KMP_SRC_LOC_PARM
    ) );
    if ( ptr != NULL ) {
            __kmp_bget_dequeue( th );         /* Release any queued buffers */
            brel( th, ptr );
    }
    KE_TRACE( 30, ( "<- __kmp_thread_free()\n" ) );
}

/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/*
    If LEAK_MEMORY is defined, __kmp_free() will *not* free memory. It causes memory leaks, but it
    may be useful for debugging memory corruptions, used freed pointers, etc.
*/
/* #define LEAK_MEMORY */

struct kmp_mem_descr {      // Memory block descriptor.
    void * ptr_allocated;   // Pointer returned by malloc(), subject for free().
    size_t size_allocated;  // Size of allocated memory block.
    void * ptr_aligned;     // Pointer to aligned memory, to be used by client code.
    size_t size_aligned;    // Size of aligned memory block.
};
typedef struct kmp_mem_descr kmp_mem_descr_t;

/*
    Allocate memory on requested boundary, fill allocated memory with 0x00.
    NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error.
    Must use __kmp_free when freeing memory allocated by this routine!
 */
static
void *
___kmp_allocate_align( size_t size, size_t alignment KMP_SRC_LOC_DECL )
{
    /*
            __kmp_allocate() allocates (by call to malloc()) bigger memory block than requested to
        return properly aligned pointer. Original pointer returned by malloc() and size of allocated
        block is saved in descriptor just before the aligned pointer. This information used by
        __kmp_free() -- it has to pass to free() original pointer, not aligned one.

            +---------+------------+-----------------------------------+---------+
            | padding | descriptor |           aligned block           | padding |
            +---------+------------+-----------------------------------+---------+
            ^                      ^
            |                      |
            |                      +- Aligned pointer returned to caller
            +- Pointer returned by malloc()

        Aligned block is filled with zeros, paddings are filled with 0xEF.
    */

    kmp_mem_descr_t  descr;
    kmp_uintptr_t    addr_allocated;        // Address returned by malloc().
    kmp_uintptr_t    addr_aligned;          // Aligned address to return to caller.
    kmp_uintptr_t    addr_descr;            // Address of memory block descriptor.

    KE_TRACE( 25, (
        "-> ___kmp_allocate_align( %d, %d ) called from %s:%d\n",
        (int) size,
        (int) alignment
        KMP_SRC_LOC_PARM
    ) );

    KMP_DEBUG_ASSERT( alignment < 32 * 1024 ); // Alignment should not be too
    KMP_DEBUG_ASSERT( sizeof( void * ) <= sizeof( kmp_uintptr_t ) );
        // Make sure kmp_uintptr_t is enough to store addresses.

    descr.size_aligned = size;
    descr.size_allocated = descr.size_aligned + sizeof( kmp_mem_descr_t ) + alignment;

    #if KMP_DEBUG
        descr.ptr_allocated = _malloc_src_loc( descr.size_allocated, _file_, _line_ );
    #else
    descr.ptr_allocated = malloc_src_loc( descr.size_allocated KMP_SRC_LOC_PARM );
    #endif
    KE_TRACE( 10, (
        "   malloc( %d ) returned %p\n",
        (int) descr.size_allocated,
        descr.ptr_allocated
    ) );
    if ( descr.ptr_allocated == NULL ) {
        KMP_FATAL( OutOfHeapMemory );
    };

    addr_allocated = (kmp_uintptr_t) descr.ptr_allocated;
    addr_aligned =
        ( addr_allocated + sizeof( kmp_mem_descr_t ) + alignment )
        & ~ ( alignment - 1 );
    addr_descr = addr_aligned - sizeof( kmp_mem_descr_t );

    descr.ptr_aligned = (void *) addr_aligned;

    KE_TRACE( 26, (
        "   ___kmp_allocate_align: "
            "ptr_allocated=%p, size_allocated=%d, "
            "ptr_aligned=%p, size_aligned=%d\n",
        descr.ptr_allocated,
        (int) descr.size_allocated,
        descr.ptr_aligned,
        (int) descr.size_aligned
    ) );

    KMP_DEBUG_ASSERT( addr_allocated <= addr_descr );
    KMP_DEBUG_ASSERT( addr_descr + sizeof( kmp_mem_descr_t ) == addr_aligned );
    KMP_DEBUG_ASSERT( addr_aligned + descr.size_aligned <= addr_allocated + descr.size_allocated );
    KMP_DEBUG_ASSERT( addr_aligned % alignment == 0 );

    #ifdef KMP_DEBUG
        memset( descr.ptr_allocated, 0xEF, descr.size_allocated );
            // Fill allocated memory block with 0xEF.
    #endif
    memset( descr.ptr_aligned, 0x00, descr.size_aligned );
        // Fill the aligned memory block (which is intended for using by caller) with 0x00. Do not
        // put this filling under KMP_DEBUG condition! Many callers expect zeroed memory. (Padding
        // bytes remain filled with 0xEF in debugging library.)
    * ( (kmp_mem_descr_t *) addr_descr ) = descr;

    KMP_MB();

    KE_TRACE( 25, ( "<- ___kmp_allocate_align() returns %p\n", descr.ptr_aligned ) );
    return descr.ptr_aligned;

} // func ___kmp_allocate_align


/*
    Allocate memory on cache line boundary, fill allocated memory with 0x00.
    Do not call this func directly! Use __kmp_allocate macro instead.
    NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error.
    Must use __kmp_free when freeing memory allocated by this routine!
 */
void *
___kmp_allocate( size_t size KMP_SRC_LOC_DECL )
{

    void * ptr;
    KE_TRACE( 25, ( "-> __kmp_allocate( %d ) called from %s:%d\n", (int) size KMP_SRC_LOC_PARM ) );
        ptr = ___kmp_allocate_align( size, __kmp_align_alloc KMP_SRC_LOC_PARM );
    KE_TRACE( 25, ( "<- __kmp_allocate() returns %p\n", ptr ) );
    return ptr;

} // func ___kmp_allocate

#if (BUILD_MEMORY==FIRST_TOUCH)
void *
__kmp_ft_page_allocate(size_t size)
{
  void *adr, *aadr;
#if KMP_OS_LINUX
  /* TODO: Use this function to get page size everywhere */
  int page_size = getpagesize();
#else
  /* TODO: Find windows function to get page size and use it everywhere */
  int page_size = PAGE_SIZE;
#endif /* KMP_OS_LINUX */

  adr = (void *) __kmp_thread_malloc( __kmp_get_thread(),
                                    size + page_size + KMP_PTR_SKIP);
  if ( adr == 0 )
    KMP_FATAL( OutOfHeapMemory );

  /* check to see if adr is on a page boundary. */
  if ( ( (kmp_uintptr_t) adr & (page_size - 1)) == 0)
    /* nothing to do if adr is already on a page boundary. */
    aadr = adr;
  else
    /* else set aadr to the first page boundary in the allocated memory. */
    aadr = (void *) ( ( (kmp_uintptr_t) adr + page_size) & ~(page_size - 1) );

  /* the first touch by the owner thread. */
  *((void**)aadr) = adr;

  /* skip the memory space used for storing adr above. */
  return (void*)((char*)aadr + KMP_PTR_SKIP);
}
#endif

/*
    Allocate memory on page boundary, fill allocated memory with 0x00.
    Does not call this func directly! Use __kmp_page_allocate macro instead.
    NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error.
    Must use __kmp_free when freeing memory allocated by this routine!
 */
void *
___kmp_page_allocate( size_t size KMP_SRC_LOC_DECL )
{
    int    page_size = 8 * 1024;
    void * ptr;

    KE_TRACE( 25, (
        "-> __kmp_page_allocate( %d ) called from %s:%d\n",
        (int) size
        KMP_SRC_LOC_PARM
    ) );
        ptr = ___kmp_allocate_align( size, page_size KMP_SRC_LOC_PARM );
    KE_TRACE( 25, ( "<- __kmp_page_allocate( %d ) returns %p\n", (int) size, ptr ) );
    return ptr;
} // ___kmp_page_allocate

/*
    Free memory allocated by __kmp_allocate() and __kmp_page_allocate().
    In debug mode, fill the memory block with 0xEF before call to free().
*/
void
___kmp_free( void * ptr KMP_SRC_LOC_DECL )
{

        kmp_mem_descr_t descr;
        kmp_uintptr_t   addr_allocated;        // Address returned by malloc().
        kmp_uintptr_t   addr_aligned;          // Aligned address passed by caller.

        KE_TRACE( 25, ( "-> __kmp_free( %p ) called from %s:%d\n", ptr KMP_SRC_LOC_PARM ) );
        KMP_ASSERT( ptr != NULL );

        descr = * ( kmp_mem_descr_t *) ( (kmp_uintptr_t) ptr - sizeof( kmp_mem_descr_t ) );

        KE_TRACE( 26, ( "   __kmp_free:     "
                        "ptr_allocated=%p, size_allocated=%d, "
                        "ptr_aligned=%p, size_aligned=%d\n",
                        descr.ptr_allocated, (int) descr.size_allocated,
                        descr.ptr_aligned, (int) descr.size_aligned ));

        addr_allocated = (kmp_uintptr_t) descr.ptr_allocated;
        addr_aligned   = (kmp_uintptr_t) descr.ptr_aligned;

        KMP_DEBUG_ASSERT( addr_aligned % CACHE_LINE == 0 );
        KMP_DEBUG_ASSERT( descr.ptr_aligned == ptr );
        KMP_DEBUG_ASSERT( addr_allocated + sizeof( kmp_mem_descr_t ) <= addr_aligned );
        KMP_DEBUG_ASSERT( descr.size_aligned < descr.size_allocated );
        KMP_DEBUG_ASSERT( addr_aligned + descr.size_aligned <= addr_allocated + descr.size_allocated );

        #ifdef KMP_DEBUG
            memset( descr.ptr_allocated, 0xEF, descr.size_allocated );
                // Fill memory block with 0xEF, it helps catch using freed memory.
        #endif

        #ifndef LEAK_MEMORY
            KE_TRACE( 10, ( "   free( %p )\n", descr.ptr_allocated ) );
        # ifdef KMP_DEBUG
            _free_src_loc( descr.ptr_allocated, _file_, _line_ );
        # else
            free_src_loc( descr.ptr_allocated KMP_SRC_LOC_PARM );
        # endif
        #endif

    KMP_MB();

    KE_TRACE( 25, ( "<- __kmp_free() returns\n" ) );

} // func ___kmp_free

/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */

#if USE_FAST_MEMORY == 3
// Allocate fast memory by first scanning the thread's free lists
// If a chunk the right size exists, grab it off the free list.
// Otherwise allocate normally using kmp_thread_malloc.

// AC: How to choose the limit? Just get 16 for now...
#define KMP_FREE_LIST_LIMIT 16

// Always use 128 bytes for determining buckets for caching memory blocks
#define DCACHE_LINE  128

void *
___kmp_fast_allocate( kmp_info_t *this_thr, size_t size KMP_SRC_LOC_DECL )
{
    void            * ptr;
    int               num_lines;
    int               idx;
    int               index;
    void            * alloc_ptr;
    size_t            alloc_size;
    kmp_mem_descr_t * descr;

    KE_TRACE( 25, ( "-> __kmp_fast_allocate( T#%d, %d ) called from %s:%d\n",
      __kmp_gtid_from_thread(this_thr), (int) size KMP_SRC_LOC_PARM ) );

    num_lines = ( size + DCACHE_LINE - 1 ) / DCACHE_LINE;
    idx = num_lines - 1;
    KMP_DEBUG_ASSERT( idx >= 0 );
    if ( idx < 2 ) {
        index = 0;       // idx is [ 0, 1 ], use first free list
        num_lines = 2;   // 1, 2 cache lines or less than cache line
    } else if ( ( idx >>= 2 ) == 0 ) {
        index = 1;       // idx is [ 2, 3 ], use second free list
        num_lines = 4;   // 3, 4 cache lines
    } else if ( ( idx >>= 2 ) == 0 ) {
        index = 2;       // idx is [ 4, 15 ], use third free list
        num_lines = 16;  // 5, 6, ..., 16 cache lines
    } else if ( ( idx >>= 2 ) == 0 ) {
        index = 3;       // idx is [ 16, 63 ], use fourth free list
        num_lines = 64;  // 17, 18, ..., 64 cache lines
    } else {
        goto alloc_call; // 65 or more cache lines ( > 8KB ), don't use free lists
    }

    ptr = this_thr->th.th_free_lists[index].th_free_list_self;
    if ( ptr != NULL ) {
        // pop the head of no-sync free list
        this_thr->th.th_free_lists[index].th_free_list_self = *((void **)ptr);
        KMP_DEBUG_ASSERT( this_thr ==
            ((kmp_mem_descr_t *)( (kmp_uintptr_t)ptr - sizeof(kmp_mem_descr_t) ))->ptr_aligned );
        goto end;
    };
    ptr = TCR_SYNC_PTR( this_thr->th.th_free_lists[index].th_free_list_sync );
    if ( ptr != NULL ) {
        // no-sync free list is empty, use sync free list (filled in by other threads only)
        // pop the head of the sync free list, push NULL instead
        while ( ! KMP_COMPARE_AND_STORE_PTR(
            &this_thr->th.th_free_lists[index].th_free_list_sync, ptr, NULL ) )
        {
            KMP_CPU_PAUSE();
            ptr = TCR_SYNC_PTR( this_thr->th.th_free_lists[index].th_free_list_sync );
        }
        // push the rest of chain into no-sync free list (can be NULL if there was the only block)
        this_thr->th.th_free_lists[index].th_free_list_self = *((void **)ptr);
        KMP_DEBUG_ASSERT( this_thr ==
            ((kmp_mem_descr_t *)( (kmp_uintptr_t)ptr - sizeof(kmp_mem_descr_t) ))->ptr_aligned );
        goto end;
    }

    alloc_call:
    // haven't found block in the free lists, thus allocate it
    size = num_lines * DCACHE_LINE;

    alloc_size = size + sizeof( kmp_mem_descr_t ) + DCACHE_LINE;
    KE_TRACE( 25, ( "__kmp_fast_allocate: T#%d Calling __kmp_thread_malloc with alloc_size %d\n",
                   __kmp_gtid_from_thread( this_thr ), alloc_size ) );
    alloc_ptr = bget( this_thr, (bufsize) alloc_size );

    // align ptr to DCACHE_LINE
    ptr = (void *)(( ((kmp_uintptr_t)alloc_ptr) + sizeof(kmp_mem_descr_t) + DCACHE_LINE ) & ~( DCACHE_LINE - 1 ));
    descr = (kmp_mem_descr_t *)( ((kmp_uintptr_t)ptr) - sizeof(kmp_mem_descr_t) );

    descr->ptr_allocated = alloc_ptr;        // remember allocated pointer
    // we don't need size_allocated
    descr->ptr_aligned   = (void *)this_thr; // remember allocating thread
                                             // (it is already saved in bget buffer,
                                             // but we may want to use another allocator in future)
    descr->size_aligned  = size;

    end:
    KE_TRACE( 25, ( "<- __kmp_fast_allocate( T#%d ) returns %p\n",
                    __kmp_gtid_from_thread( this_thr ), ptr ) );
    return ptr;
} // func __kmp_fast_allocate

// Free fast memory and place it on the thread's free list if it is of
// the correct size.
void
___kmp_fast_free( kmp_info_t *this_thr, void * ptr KMP_SRC_LOC_DECL )
{
    kmp_mem_descr_t * descr;
    kmp_info_t      * alloc_thr;
    size_t            size;
    size_t            idx;
    int               index;

    KE_TRACE( 25, ( "-> __kmp_fast_free( T#%d, %p ) called from %s:%d\n",
      __kmp_gtid_from_thread(this_thr), ptr KMP_SRC_LOC_PARM ) );
    KMP_ASSERT( ptr != NULL );

    descr = (kmp_mem_descr_t *)( ((kmp_uintptr_t)ptr) - sizeof(kmp_mem_descr_t) );

    KE_TRACE(26, ("   __kmp_fast_free:     size_aligned=%d\n",
                  (int) descr->size_aligned ) );

    size = descr->size_aligned; // 2, 4, 16, 64, 65, 66, ... cache lines

    idx = DCACHE_LINE * 2; // 2 cache lines is minimal size of block
    if ( idx == size ) {
        index = 0;       // 2 cache lines
    } else if ( ( idx <<= 1 ) == size ) {
        index = 1;       // 4 cache lines
    } else if ( ( idx <<= 2 ) == size ) {
        index = 2;       // 16 cache lines
    } else if ( ( idx <<= 2 ) == size ) {
        index = 3;       // 64 cache lines
    } else {
        KMP_DEBUG_ASSERT( size > DCACHE_LINE * 64 );
        goto free_call;  // 65 or more cache lines ( > 8KB )
    }

    alloc_thr = (kmp_info_t *)descr->ptr_aligned; // get thread owning the block
    if ( alloc_thr == this_thr ) {
        // push block to self no-sync free list, linking previous head (LIFO)
        *((void **)ptr) = this_thr->th.th_free_lists[index].th_free_list_self;
        this_thr->th.th_free_lists[index].th_free_list_self = ptr;
    } else {
        void * head = this_thr->th.th_free_lists[index].th_free_list_other;
        if ( head == NULL ) {
            // Create new free list
            this_thr->th.th_free_lists[index].th_free_list_other = ptr;
            *((void **)ptr) = NULL;             // mark the tail of the list
            descr->size_allocated = (size_t)1;  // head of the list keeps its length
        } else {
            // need to check existed "other" list's owner thread and size of queue
            kmp_mem_descr_t * dsc  = (kmp_mem_descr_t *)( (char*)head - sizeof(kmp_mem_descr_t) );
            kmp_info_t      * q_th = (kmp_info_t *)(dsc->ptr_aligned); // allocating thread, same for all queue nodes
            size_t            q_sz = dsc->size_allocated + 1;          // new size in case we add current task
            if ( q_th == alloc_thr && q_sz <= KMP_FREE_LIST_LIMIT ) {
                // we can add current task to "other" list, no sync needed
                *((void **)ptr) = head;
                descr->size_allocated = q_sz;
                this_thr->th.th_free_lists[index].th_free_list_other = ptr;
            } else {
                // either queue blocks owner is changing or size limit exceeded
                // return old queue to allocating thread (q_th) synchroneously,
                // and start new list for alloc_thr's tasks
                void * old_ptr;
                void * tail = head;
                void * next = *((void **)head);
                while ( next != NULL ) {
                    KMP_DEBUG_ASSERT(
                        // queue size should decrease by 1 each step through the list
                        ((kmp_mem_descr_t*)((char*)next - sizeof(kmp_mem_descr_t)))->size_allocated + 1 ==
                        ((kmp_mem_descr_t*)((char*)tail - sizeof(kmp_mem_descr_t)))->size_allocated );
                    tail = next;   // remember tail node
                    next = *((void **)next);
                }
                KMP_DEBUG_ASSERT( q_th != NULL );
                // push block to owner's sync free list
                old_ptr = TCR_PTR( q_th->th.th_free_lists[index].th_free_list_sync );
                /* the next pointer must be set before setting free_list to ptr to avoid
                   exposing a broken list to other threads, even for an instant. */
                *((void **)tail) = old_ptr;

                while ( ! KMP_COMPARE_AND_STORE_PTR(
                    &q_th->th.th_free_lists[index].th_free_list_sync,
                    old_ptr,
                    head ) )
                {
                    KMP_CPU_PAUSE();
                    old_ptr = TCR_PTR( q_th->th.th_free_lists[index].th_free_list_sync );
                    *((void **)tail) = old_ptr;
                }

                // start new list of not-selt tasks
                this_thr->th.th_free_lists[index].th_free_list_other = ptr;
                *((void **)ptr) = NULL;
                descr->size_allocated = (size_t)1;  // head of queue keeps its length
            }
        }
    }
    goto end;

    free_call:
    KE_TRACE(25, ( "__kmp_fast_free: T#%d Calling __kmp_thread_free for size %d\n",
                   __kmp_gtid_from_thread( this_thr), size ) );
    __kmp_bget_dequeue( this_thr );         /* Release any queued buffers */
    brel( this_thr, descr->ptr_allocated );

    end:
    KE_TRACE( 25, ( "<- __kmp_fast_free() returns\n" ) );

} // func __kmp_fast_free


// Initialize the thread free lists related to fast memory
// Only do this when a thread is initially created.
void
__kmp_initialize_fast_memory( kmp_info_t *this_thr )
{
    KE_TRACE(10, ( "__kmp_initialize_fast_memory: Called from th %p\n", this_thr ) );

    memset ( this_thr->th.th_free_lists, 0, NUM_LISTS * sizeof( kmp_free_list_t ) );
}

// Free the memory in the thread free lists related to fast memory
// Only do this when a thread is being reaped (destroyed).
void
__kmp_free_fast_memory( kmp_info_t *th )
{
    // Suppose we use BGET underlying allocator, walk through its structures...
    int          bin;
    thr_data_t * thr = get_thr_data( th );
    void      ** lst = NULL;

    KE_TRACE(5, ( "__kmp_free_fast_memory: Called T#%d\n",
                   __kmp_gtid_from_thread( th ) ) );

    __kmp_bget_dequeue( th );         // Release any queued buffers

    // Dig through free lists and extract all allocated blocks
    for ( bin = 0; bin < MAX_BGET_BINS; ++bin ) {
        bfhead_t * b = thr->freelist[ bin ].ql.flink;
        while ( b != &thr->freelist[ bin ] ) {
            if ( (kmp_uintptr_t)b->bh.bb.bthr & 1 ) {   // if the buffer is an allocated address?
                *((void**)b) = lst;   // link the list (override bthr, but keep flink yet)
                lst = (void**)b;      // push b into lst
            }
            b = b->ql.flink;          // get next buffer
        }
    }
    while ( lst != NULL ) {
        void * next = *lst;
        KE_TRACE(10, ( "__kmp_free_fast_memory: freeing %p, next=%p th %p (%d)\n",
                      lst, next, th, __kmp_gtid_from_thread( th ) ) );
        (*thr->relfcn)(lst);
        #if BufStats
            // count blocks to prevent problems in __kmp_finalize_bget()
            thr->numprel++;       /* Nr of expansion block releases */
            thr->numpblk--;       /* Total number of blocks */
        #endif
        lst = (void**)next;
    }

    KE_TRACE(5, ( "__kmp_free_fast_memory: Freed T#%d\n",
                  __kmp_gtid_from_thread( th ) ) );
}

#endif // USE_FAST_MEMORY
