Daniel Vetter
a99a4979fd
In theory gcc is free to re-load them, and if a concurrent execbuf races and updates bo->offset64 then we have a problem: execbuffer api requires that the ->presumed_offset and the one we used for the reloc matches. It does not require that the value is sensible, which means no locks needed, just a consistent load. Ken said his next series will nuke this, so just hand-roll the kernel's READ_ONCE idea inline. FIXME: Most callers of brw_emit_reloc recompute the relocation themselves, which means this doesn't really fix the race. But the long term plan is to move to per-context relocation handling, which will fix this all properly. So leave this for now as just a reminder. Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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 https://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.