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// 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 base {
// Keep a stack of registered AtExitManagers. We always operate on the most
// recent, and we should never have more than one outside of testing, when we
// use the shadow version of the constructor. We don't protect this for
// thread-safe access, since it will only be modified in testing.
static std::stack<AtExitManager*> g_managers;
AtExitManager::AtExitManager() {
DCHECK(g_managers.empty());
g_managers.push(this);
}
AtExitManager::AtExitManager(bool shadow) {
DCHECK(shadow || g_managers.empty());
g_managers.push(this);
}
AtExitManager::~AtExitManager() {
if (g_managers.empty()) {
NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager";
return;
}
DCHECK(g_managers.top() == this);
ProcessCallbacksNow();
g_managers.pop();
}
// static
void AtExitManager::RegisterCallback(AtExitCallbackType func) {
if (g_managers.empty()) {
NOTREACHED() << "Tried to RegisterCallback without an AtExitManager";
return;
}
AtExitManager* manager = g_managers.top();
AutoLock lock(manager->lock_);
manager->stack_.push(func);
}
// static
void AtExitManager::ProcessCallbacksNow() {
if (g_managers.empty()) {
NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";
return;
}
AtExitManager* manager = g_managers.top();
AutoLock lock(manager->lock_);
while (!manager->stack_.empty()) {
AtExitCallbackType func = manager->stack_.top();
manager->stack_.pop();
if (func)
func();
}
}
} // namespace base
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