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For example I have a resource lock.
So a multithreaded function checks if it’s set before accessing a resource, then if it’s not sets it
Is there a tiny possibility that between checking and setting, another thread would have set the same lock?
Depends how you want it to work. Read the man page for mutex_lock. The checking whether a lock is set is superfluous in this case, since the very act of setting the mutex pauses the thread until the mutex is available (and so any sort of
if(resource_unavailable) { wait for availability }code becomes unnecessary).