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The previous algorithm had a race because of the way we were using __sync_fetch_and_add for everything. In particular, the concept of "returning" over-allocated states in the "next > end" case was completely bogus. If too many threads were hitting the state pool at the same time, it was possible to have the following sequence: A: Get an offset (next == end) B: Get an offset (next > end) A: Resize the pool (now next < end by a lot) C: Get an offset (next < end) B: Return the over-allocated offset D: Get an offset in which case D will get the same offset as C. The solution to this race is to get rid of the concept of "returning" over-allocated states. Instead, the thread that gets a new block simply sets the next and end offsets directly and threads that over-allocate don't return anything and just futex-wait. Since you can only ever hit the over-allocate case if someone else hit the "next == end" case and hasn't resized yet, you're guaranteed that the end value will get updated and the futex won't block forever. |
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| .dir-locals.el | ||
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| Android.common.mk | ||
| Android.mk | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| SConstruct | ||
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File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see http://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.