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Simple Directmedia Layer
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Cameron Gutman f70e197363 Fix waiting on condition variables with the SRW lock implmentation 
When SleepConditionVariableSRW() releases the SRW lock internally, it causes
our SDL_mutex_srw state to become inconsistent. The lock is unowned yet inside,
the owner is still the sleeping thread and more importantly the owner count is
still 1.

The next time someone acquires the lock, they will bump the owner count from 1
to 2. At that point, the lock is hosed. From the internal lock state, it looks
to us like that owner has acquired the lock recursively, even though they have
not. When they call SDL_UnlockMutex(), it will see the owner count > 0 and not
call ReleaseSRWLockExclusive().

Now when someone calls SDL_CondSignal(), SleepConditionVariableSRW() will start
the wakeup process by attempting to re-acquire the SRW lock. This will deadlock
because the lock was never released after the other thread had used it. The
thread waiting on the condition variable will never be able to wake up, even if
the SDL_CondWaitTimeout() function is used and the timeout expires.
 		2021-02-10 10:22:20 -05:00
VisualC Added Stadia controller source file to Visual Studio and Xcode projects 2021-01-24 00:51:26 -05:00
VisualC-WinRT Add SDL_cond implementation using Windows Condition Variables 2020-12-28 11:43:11 -08:00
Xcode config.guess and config.sub updates from mainstream 2021-02-10 10:22:17 -05:00
Xcode-iOS Added weak linking to hidapi framework 2020-11-17 10:29:36 -08:00
acinclude acinclude/libtool.m4: Apply macos11 patch from libtool bug #44605 2021-01-09 00:11:20 +03:00
android-project Disabled Bluetooth if BLE is not supported 2021-01-07 19:33:12 -06:00
android-project-ant Added the old ant Android build project structure 2017-10-28 12:11:25 -07:00
build-scripts Note that the Logitech G29 (PS4) is a racing wheel 2021-02-10 10:22:18 -05:00
cmake added --enable-xinput switch for windows builds 2021-02-10 10:22:18 -05:00
debian Updated runtime dependency on libudev 2021-02-10 10:22:19 -05:00
docs Android: documention update 2021-02-10 10:22:19 -05:00
include minor updates to libc function checks 2021-02-10 10:22:19 -05:00
src Fix waiting on condition variables with the SRW lock implmentation 2021-02-10 10:22:20 -05:00
test Expose separate keyboard and mouse grab support 2021-02-10 10:22:17 -05:00
visualtest test: unify all the command line usage logging. 2019-05-28 17:39:13 -04:00
wayland-protocols Implement support for inhibiting the screensaver on Wayland 2021-01-24 00:51:25 -05:00
.hgignore Fixed bug 4965 - Update the .hgignore file 2020-02-03 16:38:07 -08:00
Android.mk minor whitespace fix 2020-10-09 03:28:30 +03:00
BUGS.txt BUGS.txt: Changed mailing list link to discourse.libsdl.org. 2017-04-01 00:05:25 -04:00
CMakeLists.txt make AddressSanitizer optional and disabled by default 2021-02-10 10:22:20 -05:00
COPYING.txt Updated copyright for 2021 2021-01-02 10:25:38 -08:00
CREDITS.txt Fixed crash if initialization of EGL failed but was tried again later. 2015-06-21 17:33:46 +02:00
INSTALL.txt More HTTPS doc tweaks. 2017-02-16 16:59:07 -05:00
Makefile.in Fixed bug 5463 - generated Wayland interfaces are included in the library's ABI 2021-01-14 14:50:15 -08:00
Makefile.minimal Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.os2 old os2 analogue joystick code ported from SDL-1.2. disabled by default, 2021-01-24 00:51:25 -05:00
Makefile.pandora Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.psp added SDL_strtokr() as a replacement for POSIX strtok_r (bug #4046.) 2019-11-20 20:40:50 +03:00
Makefile.wiz Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
README-SDL.txt More HTTPS changes in the documentation. 2017-02-16 16:52:03 -05:00
README.txt readme: correct webpage URL to use HTTPS. 2017-02-16 13:30:34 -05:00
SDL2.spec.in Fixed bug 4615 - RPM Build fails due to unpackaged files 2019-06-11 19:58:10 -07:00
SDL2Config.cmake Fixed bug 3651 - CMake build does not install CMake package configuration 2017-08-09 19:03:10 -07:00
TODO.txt Fixed crash if initialization of EGL failed but was tried again later. 2015-06-21 17:33:46 +02:00
VisualC.html Fixed two typos in documentation. 2016-01-12 22:23:53 +01:00
WhatsNew.txt Fixed the name of the PS5 hint 2020-12-09 10:39:36 -08:00
autogen.sh Don't use pushd/popd in autogen.sh; Ubuntu's /bin/sh doesn't support it. 2016-12-26 22:58:58 -05:00
cmake_uninstall.cmake.in Fixed bug 3867 - Can't find install_manifest.txt when running 'uninstall' target 2017-10-12 08:44:45 -07:00
configure minor updates to libc function checks 2021-02-10 10:22:19 -05:00
configure.ac minor updates to libc function checks 2021-02-10 10:22:19 -05:00
sdl2-config-version.cmake.in cmake: Forgot to add this file to revision control. 2020-02-25 14:52:03 -05:00
sdl2-config.cmake.in build: Merge pkg-config Libs.private into Libs for static-only builds 2020-04-11 23:38:34 +01:00
sdl2-config.in build: Don't duplicate Libs in Libs.private in pkg-config file 2020-04-12 13:24:36 +01:00
sdl2.m4 acinclude & sdl2.m4 updates: 2020-12-22 17:00:28 +03:00
sdl2.pc.in build: Merge pkg-config Libs.private into Libs for static-only builds 2020-04-11 23:38:34 +01:00

README.txt 

                         Simple DirectMedia Layer

                                  (SDL)

                                Version 2.0

---
https://www.libsdl.org/

Simple DirectMedia Layer is a cross-platform development library designed
to provide low level access to audio, keyboard, mouse, joystick, and graphics
hardware via OpenGL and Direct3D. It is used by video playback software,
emulators, and popular games including Valve's award winning catalog
and many Humble Bundle games.

More extensive documentation is available in the docs directory, starting
with README.md

Enjoy!
	Sam Lantinga				(slouken@libsdl.org)