1 files changed, 87 insertions, 0 deletions
diff --git a/base/at_exit.cc b/base/at_exit.cc
new file mode 100644
index 0000000..c43e9ac
--- /dev/null
+++ b/base/at_exit.cc
@@ -0,0 +1,87 @@
+// Copyright 2008, Google Inc.
+// 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 with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/at_exit.h"
+#include "base/logging.h"
+
+namespace {
+
+std::stack<base::AtExitCallbackType>* g_atexit_queue = NULL;
+Lock* g_atexit_lock = NULL;
+
+void ProcessCallbacks() {
+  if (!g_atexit_queue)
+    return;
+  base::AtExitCallbackType func = NULL;
+  while(!g_atexit_queue->empty()) {
+    func = g_atexit_queue->top();
+    g_atexit_queue->pop();
+    if (func)
+      func();
+  }
+}
+
+}   // namespace
+
+namespace base {
+
+AtExitManager::AtExitManager() {
+  DCHECK(NULL == g_atexit_queue);
+  DCHECK(NULL == g_atexit_lock);
+  g_atexit_lock = &lock_;
+  g_atexit_queue = &atexit_queue_;
+}
+
+AtExitManager::~AtExitManager() {
+  AutoLock lock(lock_);
+  ProcessCallbacks();
+  g_atexit_queue = NULL;
+}
+
+void AtExitManager::RegisterCallback(AtExitCallbackType func) {
+  DCHECK(NULL != g_atexit_queue);
+  DCHECK(NULL != g_atexit_lock);
+  if (!g_atexit_lock)
+    return;
+  AutoLock lock(*g_atexit_lock);
+  if (g_atexit_queue)
+    g_atexit_queue->push(func);
+}
+
+// Calls the functions registered with AtExit in LIFO order.
+void AtExitManager::ProcessCallbacksNow() {
+  DCHECK(NULL != g_atexit_lock);
+  if (!g_atexit_lock)
+    return;
+  AutoLock lock(*g_atexit_lock);
+  DCHECK(NULL != g_atexit_queue);
+  ProcessCallbacks();
+}
+
+}  // namespace base