pthread condition variables on Linux, odd behaviour

Question

I\'m synchronizing reader and writer processes on Linux.

I have 0 or more process (the readers) that need to sleep until they are woken up, read a resource, go back

Answer 1

Have you set the PTHREAD_PROCESS_SHARED attribute on both your condvar and mutex?

For Linux consult the following man pages:

• pthread_mutexattr_init (with sample)
• pthread_mutexattr_setpshared
• pthread_condattr_init
• pthread_condattr_setpshared

Methods, types, constants etc. are normally defined in /usr/include/pthread.h, /usr/include/nptl/pthread.h.