Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_SemWait.3 @ 124:bb051fa871aa release-1.2.2
Updated version to 1.2.2
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 23 Jul 2001 19:54:31 +0000 |
| parents | 55f1f1b3e27d |
| children | e5bc29de3f0a |
| rev | line source |
|---|---|
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55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
1 .TH "SDL_SemWait" "3" "Sun 10 Jun 2001, 19:41" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_SemWait\- Lock a semaphore and suspend the thread if the semaphore value is zero\&. | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 #include "SDL_thread\&.h" | |
| 8 .sp | |
| 9 \fBint \fBSDL_SemWait\fP\fR(\fBSDL_sem *sem\fR); | |
| 10 .SH "DESCRIPTION" | |
| 11 .PP | |
| 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\&. | |
| 13 .PP | |
| 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\&. | |
| 15 .SH "RETURN VALUE" | |
| 16 .PP | |
| 17 Returns \fB0\fR if successful or \fB-1\fR if there was an error (leaving the semaphore unchanged)\&. | |
| 18 .SH "EXAMPLES" | |
| 19 .PP | |
| 20 .PP | |
| 21 .nf | |
| 22 \f(CWif (SDL_SemWait(my_sem) == -1) { | |
| 23 return WAIT_FAILED; | |
| 24 } | |
| 25 | |
| 26 \&.\&.\&. | |
| 27 | |
| 28 SDL_SemPost(my_sem);\fR | |
| 29 .fi | |
| 30 .PP | |
| 31 .SH "SEE ALSO" | |
| 32 .PP | |
| 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 | |
|
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
34 ...\" created by instant / docbook-to-man, Sun 10 Jun 2001, 19:41 |