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Hash : e5619a5c
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Date : 2024-10-15T18:27:00

Use EGL sync global lock for all EGL*sync entrypoint calls

To free EGL sync operations from waiting for other EGL calls
to finish, we use a separate global lock for EGL*sync entrypoints.
Below angle::SimpleMutex are added to protect resources that may
have race condition due to being accessed by EGL*sync calls
and non EGL*sync calls at the same time:

1. Display::mContextMapMutex that protects Display::mState.contextMap

2. static angle::base::NoDestructor<angle::SimpleMutex>
anglePlatformDisplayMapMutex that protects static
angle::base::NoDestructor<ANGLEPlatformDisplayMap> displays

3. static angle::base::NoDestructor<angle::SimpleMutex>
devicePlatformDisplayMapMutex that protects static
angle::base::NoDestructor<DevicePlatformDisplayMap> displays

EGL_Terminate() entry point takes both global lock and
global egl sync lock. This is to protect Display::mSyncMap,
Display::mSyncPools, and Display::mSyncHandleAllocator being
get cleared by thread 1 calling eglTerminate, while they are
still accessed by thread 2 through a call such as eglCreateSync.
So that we won't have thread 2 finish validating the sync object with
syncID exists in Display::mSyncMap, but then find the
mSyncMap.find(syncID) returns a nullptr due to the mSyncMap
is cleared by thread 1. Same applies to EGL_LabelObjectKHR(),
EGL_ReleaseThread(), ThreadCleanupCallback().

EGL_Initialize() writes to Display::mInitialized. This is read
by EGL Sync API validation functions. EGL_Initialize() also takes
both global lock and global sync lock to prevent race conditions
between EGL_Initialize() and EGL Sync APIs.

When ANGLE_CAPTURE_ENABLED is enabled, fall back to global lock,
as the CaptureEGLCallToFrameCapture() touches many resources
(e.g. mMaxAccessedResourceIDs, mFrameCalls)
that could lead to race conditions without a global lock.

Bug: b/362604439
Change-Id: Ic0d54a4cd66743bcd0f48f41f247dd223cff2f5e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5933570
Reviewed-by: Roman Lavrov <romanl@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Igor Nazarov <i.nazarov@samsung.com>
Commit-Queue: Yuxin Hu <yuxinhu@google.com>

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