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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 62debeaac5e9
children 17376128fb56
line wrap: on
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Summary: Simple DirectMedia Layer
Name: SDL
Version: @SDL_VERSION@
Release: 1
Source: http://www.libsdl.org/release/%{name}-%{version}.tar.gz
URL: http://www.libsdl.org/
License: LGPL
Group: System Environment/Libraries
BuildRoot: %{_tmppath}/%{name}-%{version}-buildroot
Prefix: %{_prefix}
%ifos linux
Provides: libSDL-1.2.so.0
%endif

%define __defattr %defattr(-,root,root)
%define __soext so

%description
This is the Simple DirectMedia Layer, a generic API that provides low
level access to audio, keyboard, mouse, and display framebuffer across
multiple platforms.

%package devel
Summary: Libraries, includes and more to develop SDL applications.
Group: Development/Libraries
Requires: %{name} = %{version}

%description devel
This is the Simple DirectMedia Layer, a generic API that provides low
level access to audio, keyboard, mouse, and display framebuffer across
multiple platforms.

This is the libraries, include files and other resources you can use
to develop SDL applications.


%prep
%setup -q 

%build
%ifos linux
CFLAGS="$RPM_OPT_FLAGS" ./configure --prefix=%{prefix} --disable-video-aalib --disable-video-directfb --disable-video-ggi --disable-video-svga
%else
%configure
%endif
make

%install
rm -rf $RPM_BUILD_ROOT
%ifos linux
make install prefix=$RPM_BUILD_ROOT%{prefix} \
             bindir=$RPM_BUILD_ROOT%{_bindir} \
             libdir=$RPM_BUILD_ROOT%{_libdir} \
             includedir=$RPM_BUILD_ROOT%{_includedir} \
             datadir=$RPM_BUILD_ROOT%{_datadir} \
             mandir=$RPM_BUILD_ROOT%{_mandir}
ln -s libSDL-1.2.so.0 $RPM_BUILD_ROOT%{_libdir}/libSDL-1.1.so.0
%else
%makeinstall
%endif

%clean
rm -rf $RPM_BUILD_ROOT

%files
%{__defattr}
%doc README-SDL.txt COPYING CREDITS BUGS
%{_libdir}/lib*.%{__soext}.*

%files devel
%{__defattr}
%doc README README-SDL.txt COPYING CREDITS BUGS WhatsNew docs.html
%doc docs/index.html docs/html
%{_bindir}/*-config
%{_libdir}/lib*.a
%{_libdir}/lib*.la
%{_libdir}/lib*.%{__soext}
%dir %{_includedir}/SDL
%{_includedir}/SDL/*.h
%{_libdir}/pkgconfig/sdl.pc
%{_datadir}/aclocal/*
%{_mandir}/man3/*

%changelog
* Tue May 16 2006 Sam Lantinga <slouken@libsdl.org>
- Removed support for Darwin, due to build problems on ps2linux

* Mon Jan 03 2004 Anders Bjorklund <afb@algonet.se>
- Added support for Darwin, updated spec file

* Wed Jan 19 2000 Sam Lantinga <slouken@libsdl.org>
- Re-integrated spec file into SDL distribution
- 'name' and 'version' come from configure 
- Some of the documentation is devel specific
- Removed SMP support from %build - it doesn't work with libtool anyway

* Tue Jan 18 2000 Hakan Tandogan <hakan@iconsult.com>
- Hacked Mandrake sdl spec to build 1.1

* Sun Dec 19 1999 John Buswell <johnb@mandrakesoft.com>
- Build Release

* Sat Dec 18 1999 John Buswell <johnb@mandrakesoft.com>
- Add symlink for libSDL-1.0.so.0 required by sdlbomber
- Added docs

* Thu Dec 09 1999 Lenny Cartier <lenny@mandrakesoft.com>
- v 1.0.0

* Mon Nov  1 1999 Chmouel Boudjnah <chmouel@mandrakesoft.com>
- First spec file for Mandrake distribution.

# end of file