kc3-lang/angle/src/libANGLE/GlobalMutex.h

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• Hash : 8b97c8d3
  Author :
  Date : 2023-03-31T15:54:40
  

  Implement build option for load-time GlobalMutex allocation.
  
  Performance difference on S906B for 1000'000 `eglGetError()` calls.
  Before: 26.5 ms
  After:  23.8 ms
  (Assuming `angle::FastMutex2` is used).
  
  Potentially can be enabled for other platforms.
  
  Bug: angleproject:8101
  Change-Id: Ic2037edaae6da82dbded71288bae250d7981e7d3
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4386408
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Igor Nazarov <i.nazarov@samsung.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/libANGLE/GlobalMutex.h

• //
  // Copyright 2023 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // GlobalMutex.h: Defines Global Mutex and utilities.
  
  #ifndef LIBANGLE_GLOBAL_MUTEX_H_
  #define LIBANGLE_GLOBAL_MUTEX_H_
  
  #include "common/angleutils.h"
  
  namespace egl
  {
  namespace priv
  {
  class GlobalMutex;
  }  // namespace priv
  
  class [[nodiscard]] ScopedGlobalMutexLock final : angle::NonCopyable
  {
    public:
      ScopedGlobalMutexLock();
      ~ScopedGlobalMutexLock();
  
  #if !defined(ANGLE_ENABLE_GLOBAL_MUTEX_LOAD_TIME_ALLOCATE)
    private:
      priv::GlobalMutex &mMutex;
  #endif
  };
  
  // For Context protection where lock is optional. Works slower than ScopedGlobalMutexLock.
  class [[nodiscard]] ScopedOptionalGlobalMutexLock final : angle::NonCopyable
  {
    public:
      explicit ScopedOptionalGlobalMutexLock(bool enabled);
      ~ScopedOptionalGlobalMutexLock();
  
    private:
      priv::GlobalMutex *mMutex;
  };
  
  #if defined(ANGLE_PLATFORM_WINDOWS) && !defined(ANGLE_STATIC)
  void AllocateGlobalMutex();
  void DeallocateGlobalMutex();
  #endif
  
  }  // namespace egl
  
  #endif  // LIBANGLE_GLOBAL_MUTEX_H_
  

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