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

SDL_WaitSemaphore

Wait until a semaphore has a positive value and then decrements it.

Syntax

int SDL_WaitSemaphore(SDL_Semaphore *sem);

Function Parameters

sem	the semaphore wait on

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

Remarks

This function suspends the calling thread until either the semaphore pointed to by sem has a positive value or the call is interrupted by a signal or error. If the call is successful it will atomically decrement the semaphore value.

This function is the equivalent of calling SDL_WaitSemaphoreTimeout() with a time length of SDL_MUTEX_MAXWAIT.

Version

This function is available since SDL 3.0.0.

Related Functions

• SDL_CreateSemaphore
• SDL_DestroySemaphore
• SDL_PostSemaphore
• SDL_TryWaitSemaphore
• SDL_GetSemaphoreValue
• SDL_WaitSemaphore
• SDL_WaitSemaphoreTimeout

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CategoryAPI

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