Import ConditionVariable class.

src/platform/mutex.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22 matching lines @@
 #include "win32-headers.h"
 #endif
 
 #if V8_OS_POSIX
 #include <pthread.h>  // NOLINT
 #endif
 
 namespace v8 {
 namespace internal {
 
+// Forward declarations.
+class ConditionVariable;

[Michael Starzinger, 2013/09/02 19:12:43]

There should be no need to forward declare this if it is only used to declare a
friend.

[Benedikt Meurer, 2013/09/03 07:27:39]

Done.

+
 // ----------------------------------------------------------------------------
 // Mutex
 //
 // This class is a synchronization primitive that can be used to protect shared
 // data from being simultaneously accessed by multiple threads. A mutex offers
 // exclusive, non-recursive ownership semantics:
 // - A calling thread owns a mutex from the time that it successfully calls
 //   either |Lock()| or |TryLock()| until it calls |Unlock()|.
 // - When a thread owns a mutex, all other threads will block (for calls to
 //   |Lock()|) or receive a |false| return value (for |TryLock()|) if they
@@ skipping 34 matching lines @@
   const NativeHandle& native_handle() const V8_WARN_UNUSED_RESULT {
     return native_handle_;
   }
 
  private:
   NativeHandle native_handle_;
 #ifdef DEBUG
   int level_;
 #endif
 
+  V8_INLINE(void CheckHeldAndUnmark()) {

[Michael Starzinger, 2013/09/02 19:12:43]

nit: s/Check/Assert/, we use "check" to describe predicates that are also
validated in release builds, this will only be validated in debug builds.

[Benedikt Meurer, 2013/09/03 07:27:39]

Done.

+#ifdef DEBUG
+    ASSERT_EQ(1, level_);
+    level_--;
+#endif
+  }
+
+  V8_INLINE(void CheckUnheldAndMark()) {

[Michael Starzinger, 2013/09/02 19:12:43]

Likewise.

[Benedikt Meurer, 2013/09/03 07:27:39]

Done.

+#ifdef DEBUG
+    ASSERT_EQ(0, level_);
+    level_++;
+#endif
+  }
+
+  friend class ConditionVariable;
+
   DISALLOW_COPY_AND_ASSIGN(Mutex);
 };
 
 
 // POD Mutex initialized lazily (i.e. the first time Pointer() is called).
 // Usage:
 //   static LazyMutex my_mutex = LAZY_MUTEX_INITIALIZER;
 //
 //   void my_function() {
 //     LockGuard<Mutex> guard(my_mutex.Pointer());
@@ skipping 107 matching lines @@
  private:
   Mutex* mutex_;
 
   LockGuard(const LockGuard<Mutex>& other) V8_DELETE;
   LockGuard<Mutex>& operator=(const LockGuard<Mutex>& other) V8_DELETE;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_MUTEX_H_