Initial source release: v2.0.8-0-679

Change-Id: Idf6316a8faf4b4fdc54265aad12084e5aa60707a

core/include/lock.h

@@ -0,0 +1,61 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Lock - Platform independent interface for a Mutex class
+//
+#ifndef WVCDM_CORE_LOCK_H_
+#define WVCDM_CORE_LOCK_H_
+
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+
+// Simple lock class. The implementation is platform dependent.
+//
+// The lock must be unlocked by the thread that locked it.
+// The lock is also not recursive (ie. cannot be taken multiple times).
+class Lock {
+ public:
+  Lock();
+  ~Lock();
+
+  void Acquire();
+  void Release();
+
+  // Acquires a lock if not held and returns true.
+  // Returns false if the lock is held by another thread.
+  bool Try();
+
+  friend class AutoLock;
+
+ private:
+  class Impl;
+  Impl *impl_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(Lock);
+};
+
+// Manages the lock automatically. It will be locked when AutoLock
+// is constructed and release when AutoLock goes out of scope.
+class AutoLock {
+ public:
+  explicit AutoLock(Lock& lock) : lock_(&lock) {
+    lock_->Acquire();
+  }
+
+  explicit AutoLock(Lock* lock) : lock_(lock) {
+    lock_->Acquire();
+  }
+
+  ~AutoLock() {
+    lock_->Release();
+  }
+
+ private:
+  Lock *lock_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(AutoLock);
+};
+
+};  // namespace wvcdm
+
+#endif  // WVCDM_CORE_LOCK_H_