Mercurial > sdl-ios-xcode
view src/thread/win32/SDL_syssem.c @ 1029:f87f87efd45a
Date: Mon, 17 Jan 2005 20:54:50 +0200
From: Ville [snip]
Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter
Hi,
This patch removes the flicker filter option from the DirectFB backend's
Matrox CRTC2 code in SDL. I will be removing the option from DirectFB
(because it doesn't actually work) and that would cause the SDL code to
fail without this fix.
I was going to send this to some SDL list directly but libsdl.org is down
so I'm not sure what if any lists there are. Thomas Jarosch (the guy who
wrote the code) said you would accept SDL patches. Let me know if I should
send this somewhere else.
-- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Mon, 17 Jan 2005 19:38:28 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* Semaphore functions using the Win32 API */ #include <stdio.h> #include <stdlib.h> #include <windows.h> #include "SDL_error.h" #include "SDL_thread.h" #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) #include "win_ce_semaphore.h" #endif struct SDL_semaphore { #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) SYNCHHANDLE id; #else HANDLE id; #endif Uint32 volatile count; }; /* Create a semaphore */ SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) { SDL_sem *sem; /* Allocate sem memory */ sem = (SDL_sem *)malloc(sizeof(*sem)); if ( sem ) { /* Create the semaphore, with max value 32K */ #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); #else sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); #endif sem->count = initial_value; if ( ! sem->id ) { SDL_SetError("Couldn't create semaphore"); free(sem); sem = NULL; } } else { SDL_OutOfMemory(); } return(sem); } /* Free the semaphore */ void SDL_DestroySemaphore(SDL_sem *sem) { if ( sem ) { if ( sem->id ) { #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) CloseSynchHandle(sem->id); #else CloseHandle(sem->id); #endif sem->id = 0; } free(sem); } } int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) { int retval; DWORD dwMilliseconds; if ( ! sem ) { SDL_SetError("Passed a NULL sem"); return -1; } if ( timeout == SDL_MUTEX_MAXWAIT ) { dwMilliseconds = INFINITE; } else { dwMilliseconds = (DWORD)timeout; } #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { #else switch (WaitForSingleObject(sem->id, dwMilliseconds)) { #endif case WAIT_OBJECT_0: --sem->count; retval = 0; break; case WAIT_TIMEOUT: retval = SDL_MUTEX_TIMEDOUT; break; default: SDL_SetError("WaitForSingleObject() failed"); retval = -1; break; } return retval; } int SDL_SemTryWait(SDL_sem *sem) { return SDL_SemWaitTimeout(sem, 0); } int SDL_SemWait(SDL_sem *sem) { return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); } /* Returns the current count of the semaphore */ Uint32 SDL_SemValue(SDL_sem *sem) { if ( ! sem ) { SDL_SetError("Passed a NULL sem"); return 0; } return sem->count; } int SDL_SemPost(SDL_sem *sem) { if ( ! sem ) { SDL_SetError("Passed a NULL sem"); return -1; } /* Increase the counter in the first place, because * after a successful release the semaphore may * immediately get destroyed by another thread which * is waiting for this semaphore. */ ++sem->count; #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { #else if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { #endif --sem->count; /* restore */ SDL_SetError("ReleaseSemaphore() failed"); return -1; } return 0; }