Torne (Richard Coles) | c2e0dbd | 2013-05-09 18:35:53 +0100 | [diff] [blame^] | 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. |
| 4 | |
| 5 | #include "base/message_loop/message_loop_proxy_impl.h" |
| 6 | |
| 7 | #include "base/location.h" |
| 8 | #include "base/threading/thread_restrictions.h" |
| 9 | |
| 10 | namespace base { |
| 11 | |
| 12 | MessageLoopProxyImpl::~MessageLoopProxyImpl() { |
| 13 | } |
| 14 | |
| 15 | bool MessageLoopProxyImpl::PostDelayedTask( |
| 16 | const tracked_objects::Location& from_here, |
| 17 | const base::Closure& task, |
| 18 | base::TimeDelta delay) { |
| 19 | return PostTaskHelper(from_here, task, delay, true); |
| 20 | } |
| 21 | |
| 22 | bool MessageLoopProxyImpl::PostNonNestableDelayedTask( |
| 23 | const tracked_objects::Location& from_here, |
| 24 | const base::Closure& task, |
| 25 | base::TimeDelta delay) { |
| 26 | return PostTaskHelper(from_here, task, delay, false); |
| 27 | } |
| 28 | |
| 29 | bool MessageLoopProxyImpl::RunsTasksOnCurrentThread() const { |
| 30 | // We shouldn't use MessageLoop::current() since it uses LazyInstance which |
| 31 | // may be deleted by ~AtExitManager when a WorkerPool thread calls this |
| 32 | // function. |
| 33 | // http://crbug.com/63678 |
| 34 | base::ThreadRestrictions::ScopedAllowSingleton allow_singleton; |
| 35 | AutoLock lock(message_loop_lock_); |
| 36 | return (target_message_loop_ && |
| 37 | (MessageLoop::current() == target_message_loop_)); |
| 38 | } |
| 39 | |
| 40 | // MessageLoop::DestructionObserver implementation |
| 41 | void MessageLoopProxyImpl::WillDestroyCurrentMessageLoop() { |
| 42 | AutoLock lock(message_loop_lock_); |
| 43 | target_message_loop_ = NULL; |
| 44 | } |
| 45 | |
| 46 | void MessageLoopProxyImpl::OnDestruct() const { |
| 47 | // We shouldn't use MessageLoop::current() since it uses LazyInstance which |
| 48 | // may be deleted by ~AtExitManager when a WorkerPool thread calls this |
| 49 | // function. |
| 50 | // http://crbug.com/63678 |
| 51 | base::ThreadRestrictions::ScopedAllowSingleton allow_singleton; |
| 52 | bool delete_later = false; |
| 53 | { |
| 54 | AutoLock lock(message_loop_lock_); |
| 55 | if (target_message_loop_ && |
| 56 | (MessageLoop::current() != target_message_loop_)) { |
| 57 | target_message_loop_->DeleteSoon(FROM_HERE, this); |
| 58 | delete_later = true; |
| 59 | } |
| 60 | } |
| 61 | if (!delete_later) |
| 62 | delete this; |
| 63 | } |
| 64 | |
| 65 | MessageLoopProxyImpl::MessageLoopProxyImpl() |
| 66 | : target_message_loop_(MessageLoop::current()) { |
| 67 | } |
| 68 | |
| 69 | bool MessageLoopProxyImpl::PostTaskHelper( |
| 70 | const tracked_objects::Location& from_here, const base::Closure& task, |
| 71 | base::TimeDelta delay, bool nestable) { |
| 72 | AutoLock lock(message_loop_lock_); |
| 73 | if (target_message_loop_) { |
| 74 | if (nestable) { |
| 75 | target_message_loop_->PostDelayedTask(from_here, task, delay); |
| 76 | } else { |
| 77 | target_message_loop_->PostNonNestableDelayedTask(from_here, task, delay); |
| 78 | } |
| 79 | return true; |
| 80 | } |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | scoped_refptr<MessageLoopProxy> |
| 85 | MessageLoopProxy::current() { |
| 86 | MessageLoop* cur_loop = MessageLoop::current(); |
| 87 | if (!cur_loop) |
| 88 | return NULL; |
| 89 | return cur_loop->message_loop_proxy(); |
| 90 | } |
| 91 | |
| 92 | } // namespace base |