1 files changed, 72 insertions, 0 deletions
diff --git a/sfntly/port/lock.cc b/sfntly/port/lock.cc
new file mode 100644
index 0000000..6c0c309
--- /dev/null
+++ b/sfntly/port/lock.cc
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2011 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "sfntly/port/lock.h"
+
+namespace sfntly {
+
+#if defined (WIN32)
+
+Lock::Lock() {
+  // The second parameter is the spin count, for short-held locks it avoid the
+  // contending thread from going to sleep which helps performance greatly.
+  ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000);
+}
+
+Lock::~Lock() {
+  ::DeleteCriticalSection(&os_lock_);
+}
+
+bool Lock::Try() {
+  if (::TryEnterCriticalSection(&os_lock_) != FALSE) {
+    return true;
+  }
+  return false;
+}
+
+void Lock::Acquire() {
+  ::EnterCriticalSection(&os_lock_);
+}
+
+void Lock::Unlock() {
+  ::LeaveCriticalSection(&os_lock_);
+}
+
+#else  // We assume it's pthread
+
+Lock::Lock() {
+  pthread_mutex_init(&os_lock_, NULL);
+}
+
+Lock::~Lock() {
+  pthread_mutex_destroy(&os_lock_);
+}
+
+bool Lock::Try() {
+  return (pthread_mutex_trylock(&os_lock_) == 0);
+}
+
+void Lock::Acquire() {
+  pthread_mutex_lock(&os_lock_);
+}
+
+void Lock::Unlock() {
+  pthread_mutex_unlock(&os_lock_);
+}
+
+#endif
+
+}  // namespace sfntly