SDL_SemPost

Use this function to *unlock a semaphore and* atomically increase the semaphore's count _{(not blocking)}.

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Syntax

int SDL_SemPost(SDL_sem* sem)

Function Parameters

Return Value

Returns 0 on success ^{(and increments the semaphore count)} or a negative error code on failure *(leaving the semaphore unchanged)*; call SDL_GetError() for more information.

Code Examples

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SDL_SemPost(my_sem);

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Remarks

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SDL_SemPost() unlocks the semaphore pointed to by sem and atomically increments the semaphore's value. Threads that were blocking on the semaphore may be scheduled after this call succeeds.

SDL_SemPost() should be called after a semaphore is locked by a successful call to SDL_SemWait(), SDL_SemTryWait() or SDL_SemWaitTimeout().
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Related Functions

• SDL_SemTryWait *

• SDL_SemValue *

• SDL_SemWait *

• SDL_SemWaitTimeout *

CategoryAPI, CategoryMutex