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      1 // Copyright 2011 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 "cc/trees/proxy.h"
      6 
      7 #include "base/message_loop/message_loop_proxy.h"
      8 #include "base/single_thread_task_runner.h"
      9 #include "cc/trees/blocking_task_runner.h"
     10 
     11 namespace cc {
     12 
     13 base::SingleThreadTaskRunner* Proxy::MainThreadTaskRunner() const {
     14   return main_task_runner_.get();
     15 }
     16 
     17 bool Proxy::HasImplThread() const { return !!impl_task_runner_.get(); }
     18 
     19 base::SingleThreadTaskRunner* Proxy::ImplThreadTaskRunner() const {
     20   return impl_task_runner_.get();
     21 }
     22 
     23 bool Proxy::IsMainThread() const {
     24 #if DCHECK_IS_ON
     25   if (impl_thread_is_overridden_)
     26     return false;
     27 
     28   bool is_main_thread = base::PlatformThread::CurrentId() == main_thread_id_;
     29   if (is_main_thread && main_task_runner_.get()) {
     30     DCHECK(main_task_runner_->BelongsToCurrentThread());
     31   }
     32   return is_main_thread;
     33 #else
     34   return true;
     35 #endif
     36 }
     37 
     38 bool Proxy::IsImplThread() const {
     39 #if DCHECK_IS_ON
     40   if (impl_thread_is_overridden_)
     41     return true;
     42   if (!impl_task_runner_.get())
     43     return false;
     44   return impl_task_runner_->BelongsToCurrentThread();
     45 #else
     46   return true;
     47 #endif
     48 }
     49 
     50 #if DCHECK_IS_ON
     51 void Proxy::SetCurrentThreadIsImplThread(bool is_impl_thread) {
     52   impl_thread_is_overridden_ = is_impl_thread;
     53 }
     54 #endif
     55 
     56 bool Proxy::IsMainThreadBlocked() const {
     57 #if DCHECK_IS_ON
     58   return is_main_thread_blocked_;
     59 #else
     60   return true;
     61 #endif
     62 }
     63 
     64 #if DCHECK_IS_ON
     65 void Proxy::SetMainThreadBlocked(bool is_main_thread_blocked) {
     66   is_main_thread_blocked_ = is_main_thread_blocked;
     67 }
     68 #endif
     69 
     70 Proxy::Proxy(scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     71              scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
     72 #if !DCHECK_IS_ON
     73     : main_task_runner_(main_task_runner),
     74       impl_task_runner_(impl_task_runner),
     75       blocking_main_thread_task_runner_(
     76           BlockingTaskRunner::Create(main_task_runner)) {
     77 #else
     78     : main_task_runner_(main_task_runner),
     79       impl_task_runner_(impl_task_runner),
     80       blocking_main_thread_task_runner_(
     81           BlockingTaskRunner::Create(main_task_runner)),
     82       main_thread_id_(base::PlatformThread::CurrentId()),
     83       impl_thread_is_overridden_(false),
     84       is_main_thread_blocked_(false) {
     85 #endif
     86 }
     87 
     88 Proxy::~Proxy() {
     89   DCHECK(IsMainThread());
     90 }
     91 
     92 }  // namespace cc
     93