Transfer Password sync to use new sync API.
[chromium-blink-merge.git] / chrome / common / worker_thread_ticker.cc
blob1fa75e9f7daa1c191129aedee38c9803176ba7a1
1 // Copyright (c) 2012 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 "chrome/common/worker_thread_ticker.h"
7 #include <algorithm>
9 #include "base/bind.h"
10 #include "base/bind_helpers.h"
11 #include "base/logging.h"
12 #include "base/message_loop/message_loop.h"
13 #include "base/threading/thread.h"
15 WorkerThreadTicker::WorkerThreadTicker(int tick_interval)
16 : timer_thread_("worker_thread_ticker"),
17 is_running_(false),
18 tick_interval_(base::TimeDelta::FromMilliseconds(tick_interval)) {
21 WorkerThreadTicker::~WorkerThreadTicker() {
22 Stop();
25 bool WorkerThreadTicker::RegisterTickHandler(Callback *tick_handler) {
26 DCHECK(tick_handler);
27 base::AutoLock lock(lock_);
28 // You cannot change the list of handlers when the timer is running.
29 // You need to call Stop first.
30 if (IsRunning())
31 return false;
32 tick_handler_list_.push_back(tick_handler);
33 return true;
36 bool WorkerThreadTicker::UnregisterTickHandler(Callback *tick_handler) {
37 DCHECK(tick_handler);
38 base::AutoLock lock(lock_);
39 // You cannot change the list of handlers when the timer is running.
40 // You need to call Stop first.
41 if (IsRunning()) {
42 return false;
44 TickHandlerListType::iterator index = std::remove(tick_handler_list_.begin(),
45 tick_handler_list_.end(),
46 tick_handler);
47 if (index == tick_handler_list_.end()) {
48 return false;
50 tick_handler_list_.erase(index, tick_handler_list_.end());
51 return true;
54 bool WorkerThreadTicker::Start() {
55 // Do this in a lock because we don't want 2 threads to
56 // call Start at the same time
57 base::AutoLock lock(lock_);
58 if (IsRunning())
59 return false;
60 if (!timer_thread_.Start())
61 return false;
62 is_running_ = true;
63 ScheduleTimerTask();
64 return true;
67 bool WorkerThreadTicker::Stop() {
68 // Do this in a lock because we don't want 2 threads to
69 // call Stop at the same time
70 base::AutoLock lock(lock_);
71 if (!IsRunning())
72 return false;
73 is_running_ = false;
74 timer_thread_.Stop();
75 return true;
78 void WorkerThreadTicker::ScheduleTimerTask() {
79 timer_thread_.message_loop()->PostDelayedTask(
80 FROM_HERE,
81 base::Bind(&WorkerThreadTicker::TimerTask, base::Unretained(this)),
82 tick_interval_);
85 void WorkerThreadTicker::TimerTask() {
86 // When the ticker is running, the handler list CANNOT be modified.
87 // So we can do the enumeration safely without a lock
88 const TickHandlerListType& handlers = tick_handler_list_;
89 for (TickHandlerListType::const_iterator i = handlers.begin();
90 i != handlers.end(); ++i) {
91 (*i)->OnTick();
94 ScheduleTimerTask();