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


Create a semaphore.


SDL_sem* SDL_CreateSemaphore(Uint32 initial_value);

Function Parameters

initial_value the starting value of the semaphore

Return Value

Returns a new semaphore or NULL on failure; call SDL_GetError() for more information.


This function creates a new semaphore and initializes it with the value initial_value. Each wait operation on the semaphore will atomically decrement the semaphore value and potentially block if the semaphore value is 0. Each post operation will atomically increment the semaphore value and wake waiting threads and allow them to retry the wait operation.


This function is available since SDL 2.0.0.


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