SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Unlock the mutex.


int SDL_UnlockMutex(SDL_mutex * mutex) SDL_RELEASE(mutex);

Function Parameters

mutex the mutex to unlock.

Return Value

Returns 0, or -1 on error.


It is legal for the owning thread to lock an already-locked mutex. It must unlock it the same number of times before it is actually made available for other threads in the system (this is known as a "recursive mutex").

It is an error to unlock a mutex that has not been locked by the current thread, and doing so results in undefined behavior.

It is also an error to unlock a mutex that isn't locked at all.


This function is available since SDL 2.0.0.


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