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annotate docs/man3/SDL_SemWait.3 @ 4165:3b8ac3d311a2 SDL-1.2

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Hello. This patch provides basic support for video on the Sony PS3 Linux framebuffer. Scaling, format-conversion, and drawing is done from the SPEs, so there is little performance impact to PPE applications. This is by no means production quality code, but it is a very good start and a good example of how to use the PS3's hardware capabilities to accelerate video playback on the box. The driver has been verified to work with ffplay, mplayer and xine. This piece of software has been developed at the IBM R&D Lab in Boeblingen, Germany and is now returned to the community. Enjoy ! Signed-off-by: D.Herrendoerfer < d.herrendoerfer [at] de [dot] ibm [dot] com >
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Apr 2009 04:06:55 +0000
parents 4e3b250c950e
children 1238da4a7112
rev   line source
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1 .TH "SDL_SemWait" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SemWait \- Lock a semaphore and suspend the thread if the semaphore value is zero\&.
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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 \fBint \fBSDL_SemWait\fP\fR(\fBSDL_sem *sem\fR);
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10 .SH "DESCRIPTION"
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11 .PP
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12 \fBSDL_SemWait()\fP suspends the calling thread until either the semaphore pointed to by \fBsem\fR 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\&.
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13 .PP
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14 After \fBSDL_SemWait()\fP is successful, the semaphore can be released and its count atomically incremented by a successful call to \fISDL_SemPost\fR\&.
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15 .SH "RETURN VALUE"
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16 .PP
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17 Returns \fB0\fR if successful or \fB-1\fR if there was an error (leaving the semaphore unchanged)\&.
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18 .SH "EXAMPLES"
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19 .PP
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20 .PP
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21 .nf
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22 \f(CWif (SDL_SemWait(my_sem) == -1) {
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23 return WAIT_FAILED;
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24 }
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25
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26 \&.\&.\&.
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27
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28 SDL_SemPost(my_sem);\fR
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29 .fi
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30 .PP
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31 .SH "SEE ALSO"
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32 .PP
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33 \fI\fBSDL_CreateSemaphore\fP\fR, \fI\fBSDL_DestroySemaphore\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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34 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00