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

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/revocable_store.h"

     7 #include "base/logging.h"

     9 RevocableStore::Revocable::Revocable(RevocableStore* store)

    10     : store_reference_(store->owning_reference_) {

    11   // We AddRef() the owning reference.

    12   DCHECK(store_reference_->store());

    13   store_reference_->store()->Add(this);

    14 }

    16 RevocableStore::Revocable::~Revocable() {

    17   if (!revoked()) {

    18     // Notify the store of our destruction.

    19     --(store_reference_->store()->count_);

    20   }

    21 }

    23 RevocableStore::RevocableStore() : count_(0) {

    24   // Create a new owning reference.

    25   owning_reference_ = new StoreRef(this);

    26 }

    28 RevocableStore::~RevocableStore() {

    29   // Revoke all the items in the store.

    30   owning_reference_->set_store(NULL);

    31 }

    33 void RevocableStore::Add(Revocable* item) {

    34   DCHECK(!item->revoked());

    35   ++count_;

    36 }

    38 void RevocableStore::RevokeAll() {

    39   // We revoke all the existing items in the store and reset our count.

    40   owning_reference_->set_store(NULL);

    41   count_ = 0;

    43   // Then we create a new owning reference for new items that get added.

    44   // This Release()s the old owning reference, allowing it to be freed after

    45   // all the items that were in the store are eventually destroyed.

    46   owning_reference_ = new StoreRef(this);

    47 }

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