Our minimum Windows version is Windows 2000, so it's okay to directly call InitializeCriticalSectionAndSpinCount()..

 Patrick Baggett      2011-02-16 22:58:33 PST

This enhancement is for both x86/x64 Windows.

The SDL implementation of mutexes uses the Win32 API interprocess
synchronization primitive called a "Mutex". This implementation is subpar
because it has a much higher overhead than an intraprocess mutex. The exact
technical details are below, but my tests have shown that for reasonably high
contention (10 threads on 4 physical cores), it has 13x higher overhead than
the Win32 CriticalSection API.

If this enhancement is accepted, I will write a patch to implement SDL mutexes
using the critical section API, which should dramatically reduce overhead and
improve scalability.


-- Tech details --
Normally, Win32 Mutexes are used across process boundaries to synchronize
separate processes. In order to lock or unlock them, a user->kernel space
transition is necessary, even in the uncontented case on a single CPU machine.
Win32 CriticalSection objects can only be used within the same process virtual
address space and thus to lock one, does not require a user->kernel space
transition for the uncontended case, and additionally may spin a short while
before going into kernel wait. This small spin allows a thread to obtain the
lock if the mutex is released shortly after the thread starts spinning, in
effect bypassing the overhead of user->kernel space transition which has higher
overhead than the spinning itself.

Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share.

I think this also fixes the bug relating to non-latin characters in filenames, since UNICODE wasn't defined in SDL_rwops.c

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rename : src/SDL_android.cpp => src/core/android/SDL_android.cpp
rename : src/SDL_android.h => src/core/android/SDL_android.h

Changed "win32" to "windows"

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rename : include/SDL_config_win32.h => include/SDL_config_windows.h
rename : src/events/scancodes_win32.h => src/events/scancodes_windows.h
rename : src/haptic/win32/SDL_syshaptic.c => src/haptic/windows/SDL_syshaptic.c
rename : src/joystick/win32/SDL_dxjoystick.c => src/joystick/windows/SDL_dxjoystick.c
rename : src/joystick/win32/SDL_dxjoystick_c.h => src/joystick/windows/SDL_dxjoystick_c.h
rename : src/joystick/win32/SDL_mmjoystick.c => src/joystick/windows/SDL_mmjoystick.c
rename : src/loadso/win32/SDL_sysloadso.c => src/loadso/windows/SDL_sysloadso.c
rename : src/main/win32/SDL_win32_main.c => src/main/windows/SDL_windows_main.c
rename : src/main/win32/version.rc => src/main/windows/version.rc
rename : src/thread/win32/SDL_sysmutex.c => src/thread/windows/SDL_sysmutex.c
rename : src/thread/win32/SDL_syssem.c => src/thread/windows/SDL_syssem.c
rename : src/thread/win32/SDL_systhread.c => src/thread/windows/SDL_systhread.c
rename : src/thread/win32/SDL_systhread_c.h => src/thread/windows/SDL_systhread_c.h
rename : src/thread/win32/win_ce_semaphore.c => src/thread/windows/win_ce_semaphore.c
rename : src/thread/win32/win_ce_semaphore.h => src/thread/windows/win_ce_semaphore.h
rename : src/timer/win32/SDL_systimer.c => src/timer/windows/SDL_systimer.c
rename : src/video/win32/SDL_ceddrawrender.c => src/video/windows/SDL_ceddrawrender.c
rename : src/video/win32/SDL_ceddrawrender.h => src/video/windows/SDL_ceddrawrender.h
rename : src/video/win32/SDL_d3drender.c => src/video/windows/SDL_d3drender.c
rename : src/video/win32/SDL_d3drender.h => src/video/windows/SDL_d3drender.h
rename : src/video/win32/SDL_gapirender.c => src/video/windows/SDL_gapirender.c
rename : src/video/win32/SDL_gapirender.h => src/video/windows/SDL_gapirender.h
rename : src/video/win32/SDL_gapirender_c.h => src/video/windows/SDL_gapirender_c.h
rename : src/video/win32/SDL_gdirender.c => src/video/windows/SDL_gdirender.c
rename : src/video/win32/SDL_gdirender.h => src/video/windows/SDL_gdirender.h
rename : src/video/win32/SDL_msctf.h => src/video/windows/SDL_msctf.h
rename : src/video/win32/SDL_vkeys.h => src/video/windows/SDL_vkeys.h
rename : src/video/win32/SDL_win32clipboard.c => src/video/windows/SDL_windowsclipboard.c
rename : src/video/win32/SDL_win32clipboard.h => src/video/windows/SDL_windowsclipboard.h
rename : src/video/win32/SDL_win32events.c => src/video/windows/SDL_windowsevents.c
rename : src/video/win32/SDL_win32events.h => src/video/windows/SDL_windowsevents.h
rename : src/video/win32/SDL_win32gamma.c => src/video/windows/SDL_windowsgamma.c
rename : src/video/win32/SDL_win32gamma.h => src/video/windows/SDL_windowsgamma.h
rename : src/video/win32/SDL_win32keyboard.c => src/video/windows/SDL_windowskeyboard.c
rename : src/video/win32/SDL_win32keyboard.h => src/video/windows/SDL_windowskeyboard.h
rename : src/video/win32/SDL_win32modes.c => src/video/windows/SDL_windowsmodes.c
rename : src/video/win32/SDL_win32modes.h => src/video/windows/SDL_windowsmodes.h
rename : src/video/win32/SDL_win32mouse.c => src/video/windows/SDL_windowsmouse.c
rename : src/video/win32/SDL_win32mouse.h => src/video/windows/SDL_windowsmouse.h
rename : src/video/win32/SDL_win32opengl.c => src/video/windows/SDL_windowsopengl.c
rename : src/video/win32/SDL_win32opengl.h => src/video/windows/SDL_windowsopengl.h
rename : src/video/win32/SDL_win32shape.c => src/video/windows/SDL_windowsshape.c
rename : src/video/win32/SDL_win32shape.h => src/video/windows/SDL_windowsshape.h
rename : src/video/win32/SDL_win32video.c => src/video/windows/SDL_windowsvideo.c
rename : src/video/win32/SDL_win32video.h => src/video/windows/SDL_windowsvideo.h
rename : src/video/win32/SDL_win32window.c => src/video/windows/SDL_windowswindow.c
rename : src/video/win32/SDL_win32window.h => src/video/windows/SDL_windowswindow.h
rename : src/video/win32/wmmsg.h => src/video/windows/wmmsg.h

Updated copyright to LGPL version 2.1 and year 2010

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Make sure every source file includes SDL_config.h, so the proper system
headers are chosen.

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FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...

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using Visual C++ 2005

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I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.

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