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annotate docs/man3/SDL_CreateSemaphore.3 @ 2247:93994f65c74c

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Removed hermes since it's LGPL and not compatible with a commercial license. Prepping for using MMX and SSE intrinsics instead of inline assembly. .. except for memcpy equivalents which only get faster if they can exploit the parallelism of loading into multiple SIMD registers. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Aug 2007 08:21:10 +0000
parents e5bc29de3f0a
children 546f7c1eb755
rev   line source
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e5bc29de3f0a Updated from the SDL Documentation Project
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1 .TH "SDL_CreateSemaphore" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_CreateSemaphore\- Creates a new semaphore and assigns an initial value to it\&.
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 #include "SDL_thread\&.h"
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8 .sp
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9 \fBSDL_sem *\fBSDL_CreateSemaphore\fP\fR(\fBUint32 initial_value\fR);
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10 .SH "DESCRIPTION"
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11 .PP
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12 \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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13 .SH "RETURN VALUE"
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14 .PP
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15 Returns a pointer to an initialized semaphore or \fBNULL\fR if there was an error\&.
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16 .SH "EXAMPLES"
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17 .PP
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18 .PP
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19 .nf
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20 \f(CWSDL_sem *my_sem;
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21
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22 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
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23
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24 if (my_sem == NULL) {
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25 return CREATE_SEM_FAILED;
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26 }\fR
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27 .fi
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28 .PP
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29 .SH "SEE ALSO"
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30 .PP
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31 \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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32 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00