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Liu, and Ali Munir. Liu, and Rui Li. Zubair Shafiq, and Fan Zhang.
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Liu, Bargav Jayaraman, Ann L. Wang, and Rui Li. Liu, Zimu Zhou, and Yunhao Liu. Liu, Heng Qi, and Xin Xie. Wang, and Bezawada Bruhadeshwar. Liu, Qi Li, Laurent Mathy. Liu, Jeffrey Pang, and Jia Wang. Zubair Shafiq, Alex X. Liu, and Amir Khakpour. Liu and Eric Torng. There is, however, a downside to such a simple implementation: Firstly, the thread has to wake every 50ms or so or whatever the sleep period is in order to lock the mutex, check the queue, and unlock the mutex, forcing a context switch.
Secondly, the sleep period imposes a limit on how fast the thread can respond to data being added to the queue — if the data is added just before the call to sleep, the thread will wait at least 50ms before checking for data. On average, the thread will only respond to data after about half the sleep time 25ms here.
Waiting with a Condition Variable As an alternative to continuously polling the state of the queue, the sleep in the wait loop can be replaced with a condition variable wait.
If the condition variable is notified in push when data is added to an empty queue, then the waiting thread will wake.
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Firstly, the lock variable is passed as a parameter to wait — this allows the condition variable implementation to atomically unlock the mutex and add the thread to the wait queue, so that another thread can update the protected data whilst the first thread waits.
Secondly, the condition variable wait is still inside a while loop — condition variables can be subject to spurious wake-ups, so it is important to check the actual condition being waited for when the call to wait returns. By rewriting the function so that the notification comes after the mutex is unlocked, the waiting thread will be able to acquire the mutex without blocking: This does, of course, require that an instance Data can be created by the calling code in order to receive the result, which is not always the case.
In those cases, it might be worth using something like boost:: Whereas the fine-grained nature of the separate functions makes them subject to race conditions without external locking one reason why the authors of the SGI STL advocate against making things like std:: If the queue is empty, then each thread in turn will block waiting on the condition variable. When a new entry is added to the queue, one of the threads will wake and take the value, whilst the others keep blocking.