Do pthread mutexes work across threads if in shared memory?

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You need to tell the mutex to be process-shared when it’s inited:

http://www.opengroup.org/onlinepubs/007908775/xsh/pthread_mutexattr_setpshared.html

Note in particular, “The default value of the attribute is PTHREAD_PROCESS_PRIVATE”, meaning that accessing it from different processes is undefined behaviour.

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