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[xonotic/xonotic.git] / misc / builddeps / dp.win64 / share / man / man3 / SDL_SemTryWait.3
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-.TH "SDL_SemTryWait" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" 
-.SH "NAME"
-SDL_SemTryWait \- Attempt to lock a semaphore but don\&'t suspend the thread\&.
-.SH "SYNOPSIS"
-.PP
-\fB#include "SDL\&.h"
-#include "SDL_thread\&.h"
-.sp
-\fBint \fBSDL_SemTryWait\fP\fR(\fBSDL_sem *sem\fR);
-.SH "DESCRIPTION"
-.PP
-\fBSDL_SemTryWait\fP is a non-blocking varient of \fI\fBSDL_SemWait\fP\fR\&. If the value of the semaphore pointed to by \fBsem\fR is positive it will atomically decrement the semaphore value and return 0, otherwise it will return \fBSDL_MUTEX_TIMEOUT\fR instead of suspending the thread\&.
-.PP
-After \fBSDL_SemTryWait\fP is successful, the semaphore can be released and its count atomically incremented by a successful call to \fISDL_SemPost\fR\&.
-.SH "RETURN VALUE"
-.PP
-Returns \fB0\fR if the semaphore was successfully locked or either \fBSDL_MUTEX_TIMEOUT\fR or \fB-1\fR if the thread would have suspended or there was an error, respectivly\&.
-.PP
-If the semaphore was not successfully locked, the semaphore will be unchanged\&.
-.SH "EXAMPLES"
-.PP
-.PP
-.nf
-\f(CWres = SDL_SemTryWait(my_sem);
-
-if (res == SDL_MUTEX_TIMEOUT) {
-        return TRY_AGAIN;
-}
-if (res == -1) {
-        return WAIT_ERROR;
-}
-
-\&.\&.\&.
-
-SDL_SemPost(my_sem);\fR
-.fi
-.PP
-.SH "SEE ALSO"
-.PP
-\fI\fBSDL_CreateSemaphore\fP\fR, \fI\fBSDL_DestroySemaphore\fP\fR, \fI\fBSDL_SemWait\fP\fR, \fI\fBSDL_SemWaitTimeout\fP\fR, \fI\fBSDL_SemPost\fP\fR, \fI\fBSDL_SemValue\fP\fR
-.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00