nacl_init

src/untrusted/init/auto_lock.h

+// Copyright (c) 2012 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.
+
+#ifndef NATIVE_CLIENT_SRC_UNTRUSTED_INIT_AUTO_LOCK_H_
+#define NATIVE_CLIENT_SRC_UNTRUSTED_INIT_AUTO_LOCK_H_
+
+#include <pthread.h>
+#include "sdk_util/macros.h"
+#include "sdk_util/simple_lock.h"
+
+namespace nacl {
+
+// This macro is provided to allow us to quickly instrument locking for
+// debugging purposes.
+#define AUTO_LOCK(lock)                         \
+  ::nacl::AutoLock Lock##__LINE__(lock);
+
+class AutoLock {
+ public:
+  AutoLock(const SimpleLock& lock) {
+    lock_ = lock.mutex();
+    pthread_mutex_lock(lock_);
+  }
+
+  ~AutoLock() {
+    Unlock();
+  }
+
+  void Unlock() {
+    if (lock_) pthread_mutex_unlock(lock_);
+    lock_ = NULL;
+  }
+
+ private:
+  pthread_mutex_t* lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(AutoLock);
+};
+
+}  // namespace nacl
+
+#endif