mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 06:16:30 +03:00
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
// 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 <utility>
|
|
|
|
#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;
|
|
|
|
static bool g_disable_managers = false;
|
|
|
|
AtExitManager::AtExitManager()
|
|
: processing_callbacks_(false), 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);
|
|
|
|
if (!g_disable_managers)
|
|
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_);
|
|
DCHECK(!g_top_manager->processing_callbacks_);
|
|
g_top_manager->stack_.push(std::move(task));
|
|
}
|
|
|
|
// static
|
|
void AtExitManager::ProcessCallbacksNow() {
|
|
if (!g_top_manager) {
|
|
NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";
|
|
return;
|
|
}
|
|
|
|
// Callbacks may try to add new callbacks, so run them without holding
|
|
// |lock_|. This is an error and caught by the DCHECK in RegisterTask(), but
|
|
// handle it gracefully in release builds so we don't deadlock.
|
|
base::stack<base::Closure> tasks;
|
|
{
|
|
AutoLock lock(g_top_manager->lock_);
|
|
tasks.swap(g_top_manager->stack_);
|
|
g_top_manager->processing_callbacks_ = true;
|
|
}
|
|
|
|
// Relax the cross-thread access restriction to non-thread-safe RefCount.
|
|
// It's safe since all other threads should be terminated at this point.
|
|
ScopedAllowCrossThreadRefCountAccess allow_cross_thread_ref_count_access;
|
|
|
|
while (!tasks.empty()) {
|
|
base::Closure task = tasks.top();
|
|
task.Run();
|
|
tasks.pop();
|
|
}
|
|
|
|
// Expect that all callbacks have been run.
|
|
DCHECK(g_top_manager->stack_.empty());
|
|
}
|
|
|
|
void AtExitManager::DisableAllAtExitManagers() {
|
|
AutoLock lock(g_top_manager->lock_);
|
|
g_disable_managers = true;
|
|
}
|
|
|
|
AtExitManager::AtExitManager(bool shadow)
|
|
: processing_callbacks_(false), next_manager_(g_top_manager) {
|
|
DCHECK(shadow || !g_top_manager);
|
|
g_top_manager = this;
|
|
}
|
|
|
|
} // namespace base
|