I'm probably missing something obvious, but I can't see any difference between std::condition_variable and std::condition_variable_any. Why do we need both?

(I think that) the consensus number for a mutex is 2. What is the consensus number for semaphores (like in pthread_sem_*)? What is the consensus number for condition variables (like in pthread_co...

According to POSIX, It shall be safe to destroy an initialized condition variable upon which no threads are currently blocked. Further, the signal and broadcast operations are specified to unb...

Does someone have an example of how to most easily use boost::condition::timed_wait? There are some threads on the topic here, here and here, but none feature a working example. And boost doc is as...

I am trying to make a windows-version of a program written for Linux, in C++. For the program to be thread-safe, I use pthread_cond_t and pthread_cond_wait in the Linux version. These functions use...

The Linux Programming Interface book has a piece of code (producer/consumer) to show how condition variable works: static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t con...

What are the principles of a condition variable in synchronization of the processes of operating systems?

We can use either the new condition variable primitive or windows event in order to synchronize threads in WinNT v6.x or later. Consider the following two approaches, we want workers to run at the ...

Suppose some condition variable "cond" is associated with a mutex variable "mutex". If a thread is sleeping on cond after calling pthread_cond_wait(&cond,&mutex), and another thread that ha...

Say we have a single-producer-thread single-consumer-thread lockless queue, and that the producer may go long periods without producing any data. It would be beneficial to let the consumer thread s...

I've known for eons that the way you use a condition variable is lock while not task_done wait on condition variable unlock Because sometimes condition variables will spontaneously wake. But I'...

Here is the typical way to use a condition variable: // The reader(s) lock(some_mutex); if(protected_by_mutex_var != desired_value) some_condition.wait(some_mutex); unlock(some_mutex); // The wr...

I'm trying to learn about condition variables. I would like to know what are the common situations where condition variables are used. One example is in a blocking queue, where two threads access ...

I'm trying to learn about condition variables and how to use it in a producer-consumer situation. I have a queue where one thread pushes numbers into the queue while another thread popping numbers ...