glibmm: thread/thread.cc

glibmm 2.47.3

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thread/thread.cc

A glibmm thread example.

#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <queue>
#include <glibmm/random.h>
#include <glibmm/timer.h>
#include <glibmm/init.h>
namespace
{
class MessageQueue
{
public:
MessageQueue();
~MessageQueue();
void producer();
void consumer();
private:
std::mutex mutex_;
std::condition_variable cond_push_;
std::condition_variable cond_pop_;
std::queue<int> queue_;
};
MessageQueue::MessageQueue()
{}
MessageQueue::~MessageQueue()
{}
void MessageQueue::producer()
{
Glib::Rand rand (1234);
for(auto i = 0; i < 200; ++i)
{
{
std::unique_lock<std::mutex> lock (mutex_);
cond_pop_.wait(lock,
[this] () -> bool
{
return queue_.size() < 64;
});
queue_.push(i);
std::cout << '*';
std::cout.flush();
//We unlock before notifying, because that is what the documentation suggests:
//http://en.cppreference.com/w/cpp/thread/condition_variable
lock.unlock();
cond_push_.notify_one();
}
if(rand. get_bool())
continue;
Glib::usleep(rand. get_int_range(0, 100000));
}
}
void MessageQueue::consumer()
{
Glib::Rand rand (4567);
for(;;)
{
{
std::unique_lock<std::mutex> lock (mutex_);
cond_push_.wait(lock,
[this] () -> bool
{
return !queue_.empty();
});
const int i = queue_.front();
queue_.pop();
std::cout << "\x08 \x08";
std::cout.flush();
//We unlock before notifying, because that is what the documentation suggests:
//http://en.cppreference.com/w/cpp/thread/condition_variable
lock.unlock();
cond_pop_.notify_one();
if(i >= 199)
break;
}
if(rand.get_bool())
continue;
Glib::usleep(rand.get_int_range(10000, 200000));
}
}
}
int main(int, char**)
{
Glib::init();
MessageQueue queue;
//TODO: Use std::make_unique() when we use C++14:
const auto producer = std::unique_ptr<std::thread>(
new std::thread(&MessageQueue::producer, &queue));
const auto consumer = std::unique_ptr<std::thread>(
new std::thread(&MessageQueue::consumer, &queue));
producer->join();
consumer->join();
std::cout << std::endl;
return 0;
}