My preliminary exploration of thread condition Variables

The following code is my writing method:

Static bool alive = true;

Static int count = 0;

Pthread_mutex_t mutex;

Pthread_cond_t cond;

Void producer ()

{

Pthread_mutex_lock (& mutex); // Add a mutex lock

//... Do something here, queue. insert ()... or create something...

Count ++;

// If the write is as follows, consumer blocks to pthread_mutex_lock (& mutex)

// Obtain control of the mutex lock before pthread_cond_wait (& cond, & mutex.

Pthread_mutex_unlock (& mutex); // unmutex lock

Pthread_cond_signal (& cond); // wake up wait (). If there is no wait, do nothing.

// If the write is as follows, consumer blocks to pthread_mutex_lock (& mutex)

// Obtain the control of the mutex lock when pthread_cond_wait (& cond, & mutex) is possible.

Pthread_cond_signal (& cond); // wake up wait (). If there is no wait, do nothing.

Pthread_mutex_unlock (& mutex); // unmutex lock

}

Void consumer ()

{

Pthread_mutex_lock (& mutex); // Add a mutex lock

While (alive & 0 = count) {// wait only when count = 0, while () is not if (). It must be while after testing, why?

// Because pthread_cond_wait (& cond, & mutex) is divided into unlock-> wait-> lock. When a producer is like the first writing order, even if signal is obtained,

// If you cannot obtain the control of the mutex lock, the lock will be blocked, which is equivalent to rolling back two rows to pthread_mutex_lock (& mutex );

Pthread_cond_wait (& cond, & mutex); // unlock the mutex lock to sleep. After waking up, the mutex lock is automatically applied back.

}

//... Do something here, queue. get ()... or use & delete something

Count --;

Pthread_mutex_lock (& mutex); // unmutex lock

} Reprinted please indicate the source, thank you: http://blog.csdn.net/sprintfwater/article/details/21190859