write-barrier.h

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// Copyright 2021 the V8 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.
 
#ifndef V8_HEAP_CPPGC_WRITE_BARRIER_H_
#define V8_HEAP_CPPGC_WRITE_BARRIER_H_
 
#include "include/cppgc/internal/write-barrier.h"
#include "src/base/lazy-instance.h"
#include "src/base/platform/mutex.h"
 
namespace cppgc {
namespace internal {
 
class WriteBarrier::FlagUpdater final {
 public:
  static void Enter() { write_barrier_enabled_.Enter(); }
  static void Exit() { write_barrier_enabled_.Exit(); }
 
 private:
  FlagUpdater() = delete;
};
 
#if defined(CPPGC_YOUNG_GENERATION)
class V8_EXPORT_PRIVATE YoungGenerationEnabler final {
 public:
  static void Enable();
  static void Disable();
 
  static bool IsEnabled();
 
 private:
  template <typename T>
  friend class v8::base::LeakyObject;
 
  static YoungGenerationEnabler& Instance();
 
  YoungGenerationEnabler() = default;
 
  size_t is_enabled_;
  v8::base::Mutex mutex_;
};
#endif  // defined(CPPGC_YOUNG_GENERATION)
 
}  // namespace internal
}  // namespace cppgc
 
#endif  // V8_HEAP_CPPGC_WRITE_BARRIER_H_