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// Copyright 2013 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 "cc/worker_pool.h"
#include <algorithm>
#include "base/bind.h"
#include "base/stl_util.h"
#include "base/stringprintf.h"
#if defined(OS_ANDROID)
// TODO(epenner): Move thread priorities to base. (crbug.com/170549)
#include <sys/resource.h>
#endif
namespace cc {
namespace {
class WorkerPoolTaskImpl : public internal::WorkerPoolTask {
public:
WorkerPoolTaskImpl(const WorkerPool::Callback& task,
const base::Closure& reply)
: internal::WorkerPoolTask(reply),
task_(task) {}
virtual void Run(RenderingStats* rendering_stats) OVERRIDE {
task_.Run(rendering_stats);
}
private:
WorkerPool::Callback task_;
};
const char* kWorkerThreadNamePrefix = "Compositor";
// Allow two pending tasks per worker. This keeps resource usage
// low while making sure workers aren't unnecessarily idle.
const int kNumPendingTasksPerWorker = 2;
} // namespace
namespace internal {
WorkerPoolTask::WorkerPoolTask(const base::Closure& reply)
: reply_(reply) {
}
WorkerPoolTask::~WorkerPoolTask() {
}
void WorkerPoolTask::Completed() {
reply_.Run();
}
} // namespace internal
WorkerPool::Worker::Worker(
WorkerPool* worker_pool,
const std::string name,
scoped_ptr<RenderingStats> rendering_stats)
: base::Thread(name.c_str()),
worker_pool_(worker_pool),
weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
rendering_stats_(rendering_stats.Pass()) {
Start();
DCHECK(IsRunning());
}
WorkerPool::Worker::~Worker() {
DCHECK(!IsRunning());
DCHECK_EQ(pending_tasks_.size(), 0);
}
void WorkerPool::Worker::StopAfterCompletingAllPendingTasks() {
// Signals the thread to exit and returns once all pending tasks have run.
Stop();
// Complete all pending tasks. The Stop() call above guarantees that
// all tasks have finished running.
while (!pending_tasks_.empty())
OnTaskCompleted();
// Cancel all pending replies.
weak_ptr_factory_.InvalidateWeakPtrs();
}
void WorkerPool::Worker::PostTask(scoped_ptr<internal::WorkerPoolTask> task) {
DCHECK_LT(num_pending_tasks(), kNumPendingTasksPerWorker);
message_loop_proxy()->PostTaskAndReply(
FROM_HERE,
base::Bind(&Worker::RunTask,
base::Unretained(task.get()),
base::Unretained(rendering_stats_.get())),
base::Bind(&Worker::OnTaskCompleted, weak_ptr_factory_.GetWeakPtr()));
pending_tasks_.push_back(task.Pass());
worker_pool_->DidNumPendingTasksChange();
}
void WorkerPool::Worker::Init() {
#if defined(OS_ANDROID)
// TODO(epenner): Move thread priorities to base. (crbug.com/170549)
int nice_value = 10; // Idle priority.
setpriority(PRIO_PROCESS, base::PlatformThread::CurrentId(), nice_value);
#endif
}
// static
void WorkerPool::Worker::RunTask(
internal::WorkerPoolTask* task, RenderingStats* rendering_stats) {
task->Run(rendering_stats);
}
void WorkerPool::Worker::OnTaskCompleted() {
CHECK(!pending_tasks_.empty());
scoped_ptr<internal::WorkerPoolTask> task = pending_tasks_.take_front();
task->Completed();
worker_pool_->DidNumPendingTasksChange();
}
WorkerPool::WorkerPool(size_t num_threads, bool record_rendering_stats)
: workers_need_sorting_(false),
shutdown_(false) {
const std::string thread_name_prefix = kWorkerThreadNamePrefix;
while (workers_.size() < num_threads) {
int thread_number = workers_.size() + 1;
scoped_ptr<RenderingStats> rendering_stats = record_rendering_stats ?
make_scoped_ptr(new RenderingStats) : scoped_ptr<RenderingStats>();
workers_.push_back(new Worker(
this,
thread_name_prefix + StringPrintf("Worker%d", thread_number).c_str(),
rendering_stats.Pass()));
}
}
WorkerPool::~WorkerPool() {
Shutdown();
STLDeleteElements(&workers_);
}
void WorkerPool::Shutdown() {
DCHECK(!shutdown_);
shutdown_ = true;
for (WorkerVector::iterator it = workers_.begin();
it != workers_.end(); it++) {
Worker* worker = *it;
worker->StopAfterCompletingAllPendingTasks();
}
}
void WorkerPool::PostTaskAndReply(
const Callback& task, const base::Closure& reply) {
Worker* worker = GetWorkerForNextTask();
worker->PostTask(
make_scoped_ptr(new WorkerPoolTaskImpl(
task,
reply)).PassAs<internal::WorkerPoolTask>());
}
bool WorkerPool::IsBusy() {
Worker* worker = GetWorkerForNextTask();
return worker->num_pending_tasks() >= kNumPendingTasksPerWorker;
}
void WorkerPool::GetRenderingStats(RenderingStats* stats) {
stats->totalRasterizeTime = base::TimeDelta();
stats->totalPixelsRasterized = 0;
stats->totalDeferredImageDecodeCount = 0;
stats->totalDeferredImageDecodeTime = base::TimeDelta();
for (WorkerVector::iterator it = workers_.begin();
it != workers_.end(); ++it) {
Worker* worker = *it;
CHECK(worker->rendering_stats());
stats->totalRasterizeTime +=
worker->rendering_stats()->totalRasterizeTime;
stats->totalPixelsRasterized +=
worker->rendering_stats()->totalPixelsRasterized;
stats->totalDeferredImageDecodeCount +=
worker->rendering_stats()->totalDeferredImageDecodeCount;
stats->totalDeferredImageDecodeTime +=
worker->rendering_stats()->totalDeferredImageDecodeTime;
}
}
WorkerPool::Worker* WorkerPool::GetWorkerForNextTask() {
CHECK(!shutdown_);
SortWorkersIfNeeded();
return workers_.front();
}
void WorkerPool::DidNumPendingTasksChange() {
workers_need_sorting_ = true;
}
void WorkerPool::SortWorkersIfNeeded() {
if (!workers_need_sorting_)
return;
std::sort(workers_.begin(), workers_.end(), NumPendingTasksComparator());
workers_need_sorting_ = false;
}
} // namespace cc
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