Mercurial > sdl-ios-xcode
view include/SDL_main.h @ 3069:caefe2344f65
Date: Thu, 27 Dec 2007 07:38:25 +0000
From: John Bartholomew
Subject: [SDL] SDL Semaphore implementation broken on Windows?
Hi,
Over the past couple of days, I've been battling with SDL, SDL_Mixer and SMPEG to try to find an audio hang bug. I believe I've found the problem, which I think is a race condition inside SDL's semaphore implementation (at least the Windows implementation). The semaphore code uses Windows' built in semaphore functions, but it also maintains a separate count value. This count value is updated with bare increment and decrement operations in SemPost and SemWaitTimeout - no locking primitives to protect them.
In tracking down the apparent audio bug, I found that at some point a semaphore's count value was being decremented to -1, which is clearly not a valid value for it to take.
I'm still not certain exactly what sequence of operations is occuring for this to happen, but I believe that overall it's a race condition between a thread calling SemPost (which increments the count) and the thread on the other end calling SemWait (which decrements it).
I will try to make a test case to verify this, but I'm not sure if I'll be able to (threading errors being difficult to reproduce even in the best circumstances).
However, assuming this is the cause of my problems, there is a very
simple fix:
Windows provides InterlockedIncrement() and InterlockedDecrement()
functions to perform increments and decrements which are guaranteed to be atomic. So the fix is in thread/win32/SDL_syssem.c: replace occurrences of --sem->count with InterlockedDecrement(&sem->count); and replace occurrences of ++sem->count with InterlockedIncrement(&sem->count);
This is using SDL v1.2.12, built with VC++ 2008 Express, running on a
Core 2 duo processor.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Tue, 17 Feb 2009 05:39:18 +0000 |
parents | 99210400e8b9 |
children | d3baf5ac4e37 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #ifndef _SDL_main_h #define _SDL_main_h #include "SDL_stdinc.h" /* Redefine main() on some platforms so that it is called by SDL */ #if defined(__WIN32__) || \ (defined(__MWERKS__) && !defined(__BEOS__)) || \ defined(__SYMBIAN32__) || defined(__IPHONEOS__) #ifdef __cplusplus #define C_LINKAGE "C" #else #define C_LINKAGE #endif /* __cplusplus */ /* The application's main() function must be called with C linkage, and should be declared like this: #ifdef __cplusplus extern "C" #endif int main(int argc, char *argv[]) { } */ #define main SDL_main /* The prototype for the application's main() function */ extern C_LINKAGE int SDL_main(int argc, char *argv[]); /* From the SDL library code -- needed for registering the app on Win32 */ #ifdef __WIN32__ #include "begin_code.h" #ifdef __cplusplus /* *INDENT-OFF* */ extern "C" { /* *INDENT-ON* */ #endif /* This can be called to set the application class at startup */ extern DECLSPEC int SDLCALL SDL_RegisterApp(char *name, Uint32 style, void *hInst); extern DECLSPEC void SDLCALL SDL_UnregisterApp(void); #ifdef __cplusplus /* *INDENT-OFF* */ } /* *INDENT-ON* */ #endif #include "close_code.h" #endif #endif /* Need to redefine main()? */ #endif /* _SDL_main_h */ /* vi: set ts=4 sw=4 expandtab: */