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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


See if a semaphore has a positive value and decrement it if it does.


int SDL_TryWaitSemaphore(SDL_Semaphore *sem);

Function Parameters

sem the semaphore to wait on

Return Value

Returns 0 if the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait would block, or a negative error code on failure; call SDL_GetError() for more information.


This function checks to see if the semaphore pointed to by sem has a positive value and atomically decrements the semaphore value if it does. If the semaphore doesn't have a positive value, the function immediately returns SDL_MUTEX_TIMEDOUT.


This function is available since SDL 3.0.0.


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