diff -r ffa851df0825 -r 2fb8b9db1c86 symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdlsemwait.html --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdlsemwait.html Fri Jul 31 15:01:17 2009 +0100 @@ -0,0 +1,298 @@ +SDL_SemWait

SDL Library Documentation
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SDL_SemWait

Name

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

Synopsis

#include "SDL.h"
+#include "SDL_thread.h"

int SDL_SemWait(SDL_sem *sem);

Description

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

After SDL_SemWait() is successful, the semaphore +can be released and its count atomically incremented by a successful call to +SDL_SemPost.

Return Value

Returns 0 if successful or +-1 if there was an error (leaving the semaphore unchanged).

Examples

if (SDL_SemWait(my_sem) == -1) {
+        return WAIT_FAILED;
+}
+
+...
+
+SDL_SemPost(my_sem);