How I get child threads wait on a condition and all waked up by one call from parent thread?

Question

Child threads sleeps to wait condition, and the parent thread can call some routine to wake up all child threads to run?

Answer 1

If you're using POSIX threads (pthreads), then pthread_cond_wait and (in your case) pthread_cond_broadcast are your friends. :-)

Answer 2

If you are using Win32, then you can use a manual-reset Event. Your parent thread would call SetEvent() and could wake up all child threads waiting for that object with a function such as WaitForSingleObject().