1 files changed, 92 insertions, 0 deletions
diff --git a/base/message_loop/message_loop_proxy_impl.cc b/base/message_loop/message_loop_proxy_impl.cc
new file mode 100644
index 0000000..7dc8caa
--- /dev/null
+++ b/base/message_loop/message_loop_proxy_impl.cc
@@ -0,0 +1,92 @@
+// Copyright (c) 2012 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/message_loop/message_loop_proxy_impl.h"
+
+#include "base/location.h"
+#include "base/threading/thread_restrictions.h"
+
+namespace base {
+
+MessageLoopProxyImpl::~MessageLoopProxyImpl() {
+}
+
+bool MessageLoopProxyImpl::PostDelayedTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task,
+    base::TimeDelta delay) {
+  return PostTaskHelper(from_here, task, delay, true);
+}
+
+bool MessageLoopProxyImpl::PostNonNestableDelayedTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task,
+    base::TimeDelta delay) {
+  return PostTaskHelper(from_here, task, delay, false);
+}
+
+bool MessageLoopProxyImpl::RunsTasksOnCurrentThread() const {
+  // We shouldn't use MessageLoop::current() since it uses LazyInstance which
+  // may be deleted by ~AtExitManager when a WorkerPool thread calls this
+  // function.
+  // http://crbug.com/63678
+  base::ThreadRestrictions::ScopedAllowSingleton allow_singleton;
+  AutoLock lock(message_loop_lock_);
+  return (target_message_loop_ &&
+          (MessageLoop::current() == target_message_loop_));
+}
+
+// MessageLoop::DestructionObserver implementation
+void MessageLoopProxyImpl::WillDestroyCurrentMessageLoop() {
+  AutoLock lock(message_loop_lock_);
+  target_message_loop_ = NULL;
+}
+
+void MessageLoopProxyImpl::OnDestruct() const {
+  // We shouldn't use MessageLoop::current() since it uses LazyInstance which
+  // may be deleted by ~AtExitManager when a WorkerPool thread calls this
+  // function.
+  // http://crbug.com/63678
+  base::ThreadRestrictions::ScopedAllowSingleton allow_singleton;
+  bool delete_later = false;
+  {
+    AutoLock lock(message_loop_lock_);
+    if (target_message_loop_ &&
+        (MessageLoop::current() != target_message_loop_)) {
+      target_message_loop_->DeleteSoon(FROM_HERE, this);
+      delete_later = true;
+    }
+  }
+  if (!delete_later)
+    delete this;
+}
+
+MessageLoopProxyImpl::MessageLoopProxyImpl()
+    : target_message_loop_(MessageLoop::current()) {
+}
+
+bool MessageLoopProxyImpl::PostTaskHelper(
+    const tracked_objects::Location& from_here, const base::Closure& task,
+    base::TimeDelta delay, bool nestable) {
+  AutoLock lock(message_loop_lock_);
+  if (target_message_loop_) {
+    if (nestable) {
+      target_message_loop_->PostDelayedTask(from_here, task, delay);
+    } else {
+      target_message_loop_->PostNonNestableDelayedTask(from_here, task, delay);
+    }
+    return true;
+  }
+  return false;
+}
+
+scoped_refptr<MessageLoopProxy>
+MessageLoopProxy::current() {
+  MessageLoop* cur_loop = MessageLoop::current();
+  if (!cur_loop)
+    return NULL;
+  return cur_loop->message_loop_proxy();
+}
+
+}  // namespace base