1SDL_SemWait(3)                 SDL API Reference                SDL_SemWait(3)
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NAME

6       SDL_SemWait  - Lock a semaphore and suspend the thread if the semaphore
7       value is zero.
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SYNOPSIS

10       #include "SDL.h" #include "SDL_thread.h"
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12       int SDL_SemWait(SDL_sem *sem);
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DESCRIPTION

15       SDL_SemWait() suspends the calling thread until  either  the  semaphore
16       pointed  to  by  sem has a positive value, the call is interrupted by a
17       signal or error. If the call is successful it will atomically decrement
18       the semaphore value.
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20       After  SDL_SemWait()  is  successful, the semaphore can be released and
21       its count atomically incremented by a successful call to SDL_SemPost.
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RETURN VALUE

24       Returns 0 if successful or -1 if there was an error (leaving the  sema‐
25       phore unchanged).
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EXAMPLES

28       if (SDL_SemWait(my_sem) == -1) {
29               return WAIT_FAILED;
30       }
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32       ...
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34       SDL_SemPost(my_sem);
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SEE ALSO

37       SDL_CreateSemaphore, SDL_DestroySemaphore, SDL_SemTryWait, SDL_SemWait‐
38       Timeout, SDL_SemPost, SDL_SemValue
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42SDL                         Tue 11 Sep 2001, 23:00              SDL_SemWait(3)
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