The Tor Browser: ipc/chromium/src/base/at

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/at_exit.h"

     6 #include "base/logging.h"

     8 namespace base {

    10 // Keep a stack of registered AtExitManagers.  We always operate on the most

    11 // recent, and we should never have more than one outside of testing, when we

    12 // use the shadow version of the constructor.  We don't protect this for

    13 // thread-safe access, since it will only be modified in testing.

    14 static AtExitManager* g_top_manager = NULL;

    16 AtExitManager::AtExitManager() : next_manager_(NULL) {

    17   DCHECK(!g_top_manager);

    18   g_top_manager = this;

    19 }

    21 AtExitManager::AtExitManager(bool shadow) : next_manager_(g_top_manager) {

    22   DCHECK(shadow || !g_top_manager);

    23   g_top_manager = this;

    24 }

    26 AtExitManager::~AtExitManager() {

    27   if (!g_top_manager) {

    28     NOTREACHED() << "Tried to ~AtExitManager without an AtExitManager";

    29     return;

    30   }

    31   DCHECK(g_top_manager == this);

    33   ProcessCallbacksNow();

    34   g_top_manager = next_manager_;

    35 }

    37 // static

    38 void AtExitManager::RegisterCallback(AtExitCallbackType func, void* param) {

    39   if (!g_top_manager) {

    40     NOTREACHED() << "Tried to RegisterCallback without an AtExitManager";

    41     return;

    42   }

    44   DCHECK(func);

    46   AutoLock lock(g_top_manager->lock_);

    47   g_top_manager->stack_.push(CallbackAndParam(func, param));

    48 }

    50 // static

    51 void AtExitManager::ProcessCallbacksNow() {

    52   if (!g_top_manager) {

    53     NOTREACHED() << "Tried to ProcessCallbacksNow without an AtExitManager";

    54     return;

    55   }

    57   AutoLock lock(g_top_manager->lock_);

    59   while (!g_top_manager->stack_.empty()) {

    60     CallbackAndParam callback_and_param = g_top_manager->stack_.top();

    61     g_top_manager->stack_.pop();

    63     callback_and_param.func_(callback_and_param.param_);

    64   }

    65 }

    67 // static

    68 bool AtExitManager::AlreadyRegistered() {

    69   return !!g_top_manager;

    70 }

    72 }  // namespace base

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