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Asked: 2026-06-13T07:49:51+00:00

On linux with copy-on-write forking. When creating pthread interprocess mutex in a parent, will

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On linux with copy-on-write forking. When creating pthread interprocess mutex in a parent, will it be effective in the child or it will work so only if I mmap it into shared memory?

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  1. Editorial Team

    When calling fork() the whole memory space is duplicated, including mutexes, so to answer your question, the new mutex will be a copy of the parent’s mutex, so you have to mmap it.

    Note:
    You will need to set the PTHREAD_PROCESS_SHARED flag on the mutex attribute using pthread_mutexattr_getpshared().

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