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Fcntl () for thread or process synchronization?

Is it possible to use the fcntl () system call on a file to achieve thread / process synchronization (instead of semaphore)?

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Yes. Unix fcntl locks (and generally the file system resources in general) are system-wide, so any two execution threads (whether they are separate processes or not) can use them. Whether this is a good idea or not depends on the context.

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, , , , PTHREAD_PROCESS_SHARED POSIX (. pthread_mutexattr_setpshared() pthread_condattr_setpshared()). - IPC ( ..), , , (, select()). , .

, ++, ++-, , boost.interprocess ACE.

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fcntl and flock are not for a thread, but for a process, so they cannot be used to synchronize threads.

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Source: https://habr.com/ru/post/1723383/

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