Is it possible to use fcntl() system call on a file to achieve thread/process synchronization (instead of semaphoress)?
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Is it possible to use fcntl() system call on a file to achieve thread/process synchronization (instead of semaphoress)?
Yes. Unix fcntl locks (and filesystem resources in general) are system-wide, so any two threads of execution (be they separate processes or not) can use them. Whether that’s a good idea or not is context-dependent.