Update mojo sdk to rev c02a28868825edfa57ab77947b8cb15e741c5598

third_party/mojo/src/mojo/edk/system/mutex.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// A mutex class, with support for thread annotations.
+//
+// TODO(vtl): Currently, this is a fork of Chromium's
+// base/synchronization/lock.h (with names changed and minor modifications; it
+// still cheats and uses Chromium's lock_impl.*), but eventually we'll want our
+// own and, e.g., add support for non-exclusive (reader) locks.
+
+#ifndef MOJO_EDK_SYSTEM_MUTEX_H_
+#define MOJO_EDK_SYSTEM_MUTEX_H_
+
+#include "base/synchronization/lock_impl.h"
+#include "base/threading/platform_thread.h"
+#include "mojo/edk/system/system_impl_export.h"
+#include "mojo/edk/system/thread_annotations.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+namespace system {
+
+// Mutex -----------------------------------------------------------------------
+
+class MOJO_SYSTEM_IMPL_EXPORT MOJO_LOCKABLE Mutex {
+ public:
+#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
+  Mutex() : lock_() {}
+  ~Mutex() {}
+
+  void Lock() MOJO_EXCLUSIVE_LOCK_FUNCTION() { lock_.Lock(); }
+  void Unlock() MOJO_UNLOCK_FUNCTION() { lock_.Unlock(); }
+
+  bool TryLock() MOJO_EXCLUSIVE_TRYLOCK_FUNCTION(true) { return lock_.Try(); }
+
+  void AssertHeld() const MOJO_ASSERT_EXCLUSIVE_LOCK() {}
+#else
+  Mutex();
+  ~Mutex();
+
+  void Lock() MOJO_EXCLUSIVE_LOCK_FUNCTION() {
+    lock_.Lock();
+    CheckUnheldAndMark();
+  }
+  void Unlock() MOJO_UNLOCK_FUNCTION() {
+    CheckHeldAndUnmark();
+    lock_.Unlock();
+  }
+
+  bool TryLock() MOJO_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+    bool rv = lock_.Try();
+    if (rv)
+      CheckUnheldAndMark();
+    return rv;
+  }
+
+  void AssertHeld() const MOJO_ASSERT_EXCLUSIVE_LOCK();
+#endif  // NDEBUG && !DCHECK_ALWAYS_ON
+
+ private:
+#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
+  void CheckHeldAndUnmark();
+  void CheckUnheldAndMark();
+
+  base::PlatformThreadRef owning_thread_ref_;
+#endif  // !NDEBUG || DCHECK_ALWAYS_ON
+
+  base::internal::LockImpl lock_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(Mutex);
+};
+
+// MutexLocker -----------------------------------------------------------------
+
+class MOJO_SYSTEM_IMPL_EXPORT MOJO_SCOPED_LOCKABLE MutexLocker {
+ public:
+  explicit MutexLocker(Mutex* mutex) MOJO_EXCLUSIVE_LOCK_FUNCTION(mutex)
+      : mutex_(mutex) {
+    this->mutex_->Lock();
+  }
+  ~MutexLocker() MOJO_UNLOCK_FUNCTION() { this->mutex_->Unlock(); }
+
+ private:
+  Mutex* const mutex_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(MutexLocker);
+};
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_MUTEX_H_