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| 1 // Copyright 2013 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/base/blocking_task_runner.h" | |
| 6 | |
| 7 #include <utility> | |
| 8 | |
| 9 #include "base/callback.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/message_loop/message_loop_proxy.h" | |
| 12 | |
| 13 namespace cc { | |
| 14 | |
| 15 // static | |
| 16 scoped_ptr<BlockingTaskRunner> BlockingTaskRunner::Create( | |
| 17 scoped_refptr<base::SingleThreadTaskRunner> task_runner) { | |
| 18 return make_scoped_ptr(new BlockingTaskRunner(task_runner)); | |
| 19 } | |
| 20 | |
| 21 BlockingTaskRunner::BlockingTaskRunner( | |
| 22 scoped_refptr<base::SingleThreadTaskRunner> task_runner) | |
| 23 : thread_id_(base::PlatformThread::CurrentId()), | |
| 24 task_runner_(task_runner), | |
| 25 capture_(0) { | |
| 26 } | |
| 27 | |
| 28 BlockingTaskRunner::~BlockingTaskRunner() { | |
| 29 } | |
| 30 | |
| 31 bool BlockingTaskRunner::BelongsToCurrentThread() { | |
| 32 return base::PlatformThread::CurrentId() == thread_id_; | |
| 33 } | |
| 34 | |
| 35 bool BlockingTaskRunner::PostTask(const tracked_objects::Location& from_here, | |
| 36 const base::Closure& task) { | |
| 37 base::AutoLock lock(lock_); | |
| 38 DCHECK(task_runner_.get() || capture_); | |
| 39 if (!capture_) | |
| 40 return task_runner_->PostTask(from_here, task); | |
| 41 captured_tasks_.push_back(task); | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 void BlockingTaskRunner::SetCapture(bool capture) { | |
| 46 DCHECK(BelongsToCurrentThread()); | |
| 47 | |
| 48 std::vector<base::Closure> tasks; | |
| 49 | |
| 50 { | |
| 51 base::AutoLock lock(lock_); | |
| 52 capture_ += capture ? 1 : -1; | |
| 53 DCHECK_GE(capture_, 0); | |
| 54 | |
| 55 if (capture_) | |
| 56 return; | |
| 57 | |
| 58 // We're done capturing, so grab all the captured tasks and run them. | |
| 59 tasks.swap(captured_tasks_); | |
| 60 } | |
| 61 for (size_t i = 0; i < tasks.size(); ++i) | |
| 62 tasks[i].Run(); | |
| 63 } | |
| 64 | |
| 65 BlockingTaskRunner::CapturePostTasks::CapturePostTasks( | |
| 66 BlockingTaskRunner* blocking_runner) | |
| 67 : blocking_runner_(blocking_runner) { | |
| 68 blocking_runner_->SetCapture(true); | |
| 69 } | |
| 70 | |
| 71 BlockingTaskRunner::CapturePostTasks::~CapturePostTasks() { | |
| 72 blocking_runner_->SetCapture(false); | |
| 73 } | |
| 74 | |
| 75 } // namespace cc | |
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