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// Copyright (c) 2011 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 "base/at_exit.h"
#include <stddef.h>
#include <ostream>
#include "base/bind.h"
#include "base/callback.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 (for a
// statically linked version of this library). Testing may use the shadow
// version of the constructor, and if we are building a dynamic library we may
// end up with multiple AtExitManagers on the same process. We don't protect
// this for thread-safe access, since it will only be modified in testing.
static AtExitManager* g_top_manager = NULL;
AtExitManager::AtExitManager() : next_manager_(g_top_manager) {
// If multiple modules instantiate AtExitManagers they'll end up living in this
// module... they have to coexist.
#if !defined(COMPONENT_BUILD)
DCHECK(!g_top_manager);
#endif
g_top_manager = this;
}
AtExitManager::~AtExitManager() {
if (!g_top_manager) {
NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager";
return;
}
DCHECK_EQ(this, g_top_manager);
ProcessCallbacksNow();
g_top_manager = next_manager_;
}
// static
void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) {
DCHECK(func);
RegisterTask(base::Bind(func, param));
}
// static
void AtExitManager::RegisterTask(base::Closure task) {
if (!g_top_manager) {
NOTREACHED() << "Tried to RegisterCallback without an AtExitManager";
return;
}
AutoLock lock(g_top_manager->lock_);
g_top_manager->stack_.push(task);
}
// static
void AtExitManager::ProcessCallbacksNow() {
if (!g_top_manager) {
NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";
return;
}
AutoLock lock(g_top_manager->lock_);
while (!g_top_manager->stack_.empty()) {
base::Closure task = g_top_manager->stack_.top();
task.Run();
g_top_manager->stack_.pop();
}
}
AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) {
DCHECK(shadow || !g_top_manager);
g_top_manager = this;
}
} // namespace base
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