1 files changed, 52 insertions, 0 deletions
diff --git a/chromium/mojo/public/cpp/utility/lib/mutex.cc b/chromium/mojo/public/cpp/utility/lib/mutex.cc
new file mode 100644
index 00000000000..23370e1c023
--- /dev/null
+++ b/chromium/mojo/public/cpp/utility/lib/mutex.cc
@@ -0,0 +1,52 @@
+// Copyright 2014 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.
+
+#include "mojo/public/cpp/utility/mutex.h"
+
+#include <assert.h>
+#include <errno.h>
+
+namespace mojo {
+
+// Release builds have inlined (non-error-checking) definitions in the header.
+#if !defined(NDEBUG)
+Mutex::Mutex() {
+  pthread_mutexattr_t mutexattr;
+  int rv = pthread_mutexattr_init(&mutexattr);
+  assert(rv == 0);
+  rv = pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_ERRORCHECK);
+  assert(rv == 0);
+  rv = pthread_mutex_init(&mutex_, &mutexattr);
+  assert(rv == 0);
+  rv = pthread_mutexattr_destroy(&mutexattr);
+  assert(rv == 0);
+}
+
+Mutex::~Mutex() {
+  int rv = pthread_mutex_destroy(&mutex_);
+  assert(rv == 0);
+}
+
+void Mutex::Lock() {
+  int rv = pthread_mutex_lock(&mutex_);
+  assert(rv == 0);
+}
+
+void Mutex::Unlock() {
+  int rv = pthread_mutex_unlock(&mutex_);
+  assert(rv == 0);
+}
+
+bool Mutex::TryLock() {
+  int rv = pthread_mutex_trylock(&mutex_);
+  assert(rv == 0 || rv == EBUSY);
+  return rv == 0;
+}
+
+void Mutex::AssertHeld() {
+  assert(pthread_mutex_lock(&mutex_) == EDEADLK);
+}
+#endif  // !defined(NDEBUG)
+
+}  // namespace mojo