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Comment: create page, add content (Wed Mar 10 ver; changeset 4428)
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| Use this function to atomically (?? automatically ??) increase the semaphore's count (not blocking). | Use this function to *unlock a semaphore and* atomically increase the semaphore's count ,,(not blocking),,. <<Color2(green,See Remarks.)>> |
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| ||'''sem'''||^a pointer to the SDL_sem structure to be affected^|| | ||'''sem'''||^the semaphore to increment^|| |
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| Returns 0 on success, or -1 on failure; call [[SDL_GetError]]() for more information. | 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. |
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| You can add your code example here | SDL_SemPost(my_sem); |
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| * | |
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| ''You can add useful comments here'' | *<<BR>>[[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]](). <<BR>>* <<Color2(green,Should the (not blocking) addendum from the header description be moved down here and explained more fully?)>> |
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| .[[SDL_SemTryWait]] * .[[SDL_SemValue]] * .[[SDL_SemWait]] * .[[SDL_SemWaitTimeout]] * |
DRAFT |
SDL_SemPost
Use this function to *unlock a semaphore and* atomically increase the semaphore's count (not blocking).
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Contents
Syntax
int SDL_SemPost(SDL_sem* sem)
Function Parameters
sem |
the semaphore to increment |
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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