kc3-lang/angle

2021-03-31T12:52:00

Fix multithreaded crash on draw commands on D3D11 backend. A crash can occur if thread A is executing eglDestroyContext while thread B issues a draw call, if the threads are interleaved in such a manner that a makeCurrent occurs without triggering a change to the global context and a dirtyAllState call. We handle that case by explicitly making current the proper contexts in the eglDestroyContext call. A test has been added that triggers a crash without this fix when running on the D3D11 backend. In addition, all of MultithreadingTest is enabled for the D3D11 backend. Test: Ran MultithreadingTest. Test exhibits a crash before this change, and does not after this change. Also ran: dEQP-EGL.functional.sharing.gles2.multithread.* dEQP-EGL.functional.multithread.* Bug: b/183756357 Change-Id: Ic6f76a062868b2f3b4e60d29dc087ec180bfb7cd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2798591 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Doug Horn <doughorn@google.com>