Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_CreateSemaphore.3 @ 1754:c67921b517c3
Date: Sun, 30 Apr 2006 14:20:05 +1000
From: Rob
Subject: [SDL] SDL pre-release
OpenGL fails on the zipped pre-release source accessible from
http://www.libsdl.org/svn.php.
Appears to be following lines in sdl_wing.c (lines 341-345):
wglext = (const char *)this->glGetString(GL_EXTENSIONS);
if ( !SDL_strstr(wglext, "WGL_EXT_swap_control") ) {
this->gl_data->wglSwapIntervalEXT = NULL;
this->gl_data->wglGetSwapIntervalEXT = NULL;
}
glGetString is a null pointer, as are other gl function pointers, so call
fails. Never looked at sdl source before, so no further than that as yet.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 01 May 2006 07:15:35 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_CreateSemaphore" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_CreateSemaphore\- Creates a new semaphore and assigns an initial value to it\&. | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 #include "SDL_thread\&.h" | |
| 8 .sp | |
| 9 \fBSDL_sem *\fBSDL_CreateSemaphore\fP\fR(\fBUint32 initial_value\fR); | |
| 10 .SH "DESCRIPTION" | |
| 11 .PP | |
| 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\&. | |
| 13 .SH "RETURN VALUE" | |
| 14 .PP | |
| 15 Returns a pointer to an initialized semaphore or \fBNULL\fR if there was an error\&. | |
| 16 .SH "EXAMPLES" | |
| 17 .PP | |
| 18 .PP | |
| 19 .nf | |
| 20 \f(CWSDL_sem *my_sem; | |
| 21 | |
| 22 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE); | |
| 23 | |
| 24 if (my_sem == NULL) { | |
| 25 return CREATE_SEM_FAILED; | |
| 26 }\fR | |
| 27 .fi | |
| 28 .PP | |
| 29 .SH "SEE ALSO" | |
| 30 .PP | |
| 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 | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
32 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00 |