.TH "SDL_CreateSemaphore" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" +
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.SH "NAME"+
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SDL_CreateSemaphore \- Creates a new semaphore and assigns an initial value to it\&.+
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.SH "SYNOPSIS"+
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.PP+
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\fB#include "SDL\&.h"+
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#include "SDL_thread\&.h"+
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.sp+
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\fBSDL_sem *\fBSDL_CreateSemaphore\fP\fR(\fBUint32 initial_value\fR);+
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.SH "DESCRIPTION"+
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.PP+
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\fBSDL_CreateSemaphore()\fP creates a new semaphore and initializes it with the value \fBinitial_value\fR\&. Each locking operation on the semaphore by \fISDL_SemWait\fR, \fISDL_SemTryWait\fR or \fISDL_SemWaitTimeout\fR will atomically decrement the semaphore value\&. The locking operation will be blocked if the semaphore value is not positive (greater than zero)\&. Each unlock operation by \fISDL_SemPost\fR will atomically increment the semaphore value\&.+
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.SH "RETURN VALUE"+
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.PP+
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Returns a pointer to an initialized semaphore or \fBNULL\fR if there was an error\&.+
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.SH "EXAMPLES"+
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.PP+
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.PP+
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.nf+
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\f(CWSDL_sem *my_sem;+
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+
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my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);+
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+
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if (my_sem == NULL) {+
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        return CREATE_SEM_FAILED;+
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}\fR+
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.fi+
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.PP+
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.SH "SEE ALSO"+
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.PP+
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\fI\fBSDL_DestroySemaphore\fP\fR, \fI\fBSDL_SemWait\fP\fR, \fI\fBSDL_SemTryWait\fP\fR, \fI\fBSDL_SemWaitTimeout\fP\fR, \fI\fBSDL_SemPost\fP\fR, \fI\fBSDL_SemValue\fP\fR+
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00+
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