/*
    Copyright 2005-2015 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks. Threading Building Blocks is free software;
    you can redistribute it and/or modify it under the terms of the GNU General Public License
    version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks is
    distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
    implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    See  the GNU General Public License for more details.   You should have received a copy of
    the  GNU General Public License along with Threading Building Blocks; if not, write to the
    Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA

    As a special exception,  you may use this file  as part of a free software library without
    restriction.  Specifically,  if other files instantiate templates  or use macros or inline
    functions from this file, or you compile this file and link it with other files to produce
    an executable,  this file does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however invalidate any other
    reasons why the executable file might be covered by the GNU General Public License.
*/

#if _WIN32||_WIN64
#include <process.h>        // _beginthreadex()
#endif
#include <errno.h>
#include "tbb_misc.h"       // handle_win_error()
#include "tbb/tbb_stddef.h"
#include "tbb/tbb_thread.h"
#include "tbb/tbb_allocator.h"
#include "tbb/global_control.h" // thread_stack_size
#include "governor.h"       // default_num_threads()
#if __TBB_WIN8UI_SUPPORT
#include <thread>
#endif

namespace tbb {
namespace internal {

//! Allocate a closure
void* allocate_closure_v3( size_t size )
{
    return allocate_via_handler_v3( size );
}

//! Free a closure allocated by allocate_closure_v3
void free_closure_v3( void *ptr )
{
    deallocate_via_handler_v3( ptr );
}

void tbb_thread_v3::join()
{
    if (!joinable())
        handle_perror( EINVAL, "tbb_thread::join" ); // Invalid argument
    if (this_tbb_thread::get_id() == get_id())
        handle_perror( EDEADLK, "tbb_thread::join" ); // Resource deadlock avoided
#if _WIN32||_WIN64
#if __TBB_WIN8UI_SUPPORT
    std::thread* thread_tmp=(std::thread*)my_thread_id;
    thread_tmp->join();
    delete thread_tmp;
#else // __TBB_WIN8UI_SUPPORT
    DWORD status = WaitForSingleObjectEx( my_handle, INFINITE, FALSE );
    if ( status == WAIT_FAILED )
        handle_win_error( GetLastError() );
    BOOL close_stat = CloseHandle( my_handle );
    if ( close_stat == 0 )
        handle_win_error( GetLastError() );
    my_thread_id = 0;
#endif // __TBB_WIN8UI_SUPPORT
#else
    int status = pthread_join( my_handle, NULL );
    if( status )
        handle_perror( status, "pthread_join" );
#endif // _WIN32||_WIN64
    my_handle = 0;
}

void tbb_thread_v3::detach() {
    if (!joinable())
        handle_perror( EINVAL, "tbb_thread::detach" ); // Invalid argument
#if _WIN32||_WIN64
    BOOL status = CloseHandle( my_handle );
    if ( status == 0 )
      handle_win_error( GetLastError() );
    my_thread_id = 0;
#else
    int status = pthread_detach( my_handle );
    if( status )
        handle_perror( status, "pthread_detach" );
#endif // _WIN32||_WIN64
    my_handle = 0;
}

void tbb_thread_v3::internal_start( __TBB_NATIVE_THREAD_ROUTINE_PTR(start_routine),
                                    void* closure ) {
#if _WIN32||_WIN64
#if __TBB_WIN8UI_SUPPORT
    std::thread* thread_tmp=new std::thread(start_routine, closure);
    my_handle  = thread_tmp->native_handle();
//  TODO: to find out the way to find thread_id without GetThreadId and other
//  desktop functions.
//  Now tbb_thread does have its own thread_id that stores std::thread object
    my_thread_id = (size_t)thread_tmp;
#else
    unsigned thread_id;
    // The return type of _beginthreadex is "uintptr_t" on new MS compilers,
    // and 'unsigned long' on old MS compilers.  uintptr_t works for both.
    uintptr_t status = _beginthreadex( NULL, (unsigned)global_control::active_value(global_control::thread_stack_size),
                                       start_routine, closure, 0, &thread_id );
    if( status==0 )
        handle_perror(errno,"__beginthreadex");
    else {
        my_handle = (HANDLE)status;
        my_thread_id = thread_id;
    }
#endif
#else
    pthread_t thread_handle;
    int status;
    pthread_attr_t stack_size;
    status = pthread_attr_init( &stack_size );
    if( status )
        handle_perror( status, "pthread_attr_init" );
    status = pthread_attr_setstacksize( &stack_size, global_control::active_value(global_control::thread_stack_size) );
    if( status )
        handle_perror( status, "pthread_attr_setstacksize" );

    status = pthread_create( &thread_handle, &stack_size, start_routine, closure );
    if( status )
        handle_perror( status, "pthread_create" );
    status = pthread_attr_destroy( &stack_size );
    if( status )
        handle_perror( status, "pthread_attr_destroy" );

    my_handle = thread_handle;
#endif // _WIN32||_WIN64
}

unsigned tbb_thread_v3::hardware_concurrency() __TBB_NOEXCEPT(true) {
    return governor::default_num_threads();
}

tbb_thread_v3::id thread_get_id_v3() {
#if _WIN32||_WIN64
    return tbb_thread_v3::id( GetCurrentThreadId() );
#else
    return tbb_thread_v3::id( pthread_self() );
#endif // _WIN32||_WIN64
}
    
void move_v3( tbb_thread_v3& t1, tbb_thread_v3& t2 )
{
    if (t1.joinable())
        t1.detach();
    t1.my_handle = t2.my_handle;
    t2.my_handle = 0;
#if _WIN32||_WIN64
    t1.my_thread_id = t2.my_thread_id;
    t2.my_thread_id = 0;
#endif // _WIN32||_WIN64
}

void thread_yield_v3()
{
    __TBB_Yield();
}

void thread_sleep_v3(const tick_count::interval_t &i)
{
#if _WIN32||_WIN64
     tick_count t0 = tick_count::now();
     tick_count t1 = t0;
     for(;;) {
         double remainder = (i-(t1-t0)).seconds()*1e3;  // milliseconds remaining to sleep
         if( remainder<=0 ) break;
         DWORD t = remainder>=INFINITE ? INFINITE-1 : DWORD(remainder);
#if !__TBB_WIN8UI_SUPPORT
         Sleep( t );
#else
         std::chrono::milliseconds sleep_time( t );
         std::this_thread::sleep_for( sleep_time );
#endif
         t1 = tick_count::now();
    }
#else
    struct timespec req;
    double sec = i.seconds();

    req.tv_sec = static_cast<long>(sec);
    req.tv_nsec = static_cast<long>( (sec - req.tv_sec)*1e9 );
    nanosleep(&req, NULL);
#endif // _WIN32||_WIN64
}

} // internal
} // tbb
