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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.
#ifndef CC_WORKER_POOL_H_
#define CC_WORKER_POOL_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread.h"
#include "cc/rendering_stats.h"
#include "cc/scoped_ptr_deque.h"
namespace cc {
namespace internal {
class WorkerPoolTask {
public:
virtual ~WorkerPoolTask();
virtual void Run(RenderingStats* rendering_stats) = 0;
void Completed();
protected:
WorkerPoolTask(const base::Closure& reply);
base::Closure reply_;
};
} // namespace internal
// A worker thread pool that runs rendering tasks and guarantees completion
// of all pending tasks at shutdown.
class WorkerPool {
public:
typedef base::Callback<void(RenderingStats*)> Callback;
virtual ~WorkerPool();
static scoped_ptr<WorkerPool> Create(size_t num_threads) {
return make_scoped_ptr(new WorkerPool(num_threads));
}
// Tells the worker pool to shutdown and returns once all pending tasks have
// completed.
void Shutdown();
// Posts |task| to worker pool. On completion, |reply|
// is posted to the thread that called PostTaskAndReply().
void PostTaskAndReply(const Callback& task, const base::Closure& reply);
// Returns true when worker pool has reached its internal limit for number
// of pending tasks.
bool IsBusy();
// Toggle rendering stats collection.
void SetRecordRenderingStats(bool record_rendering_stats);
// Collect rendering stats all completed tasks.
void GetRenderingStats(RenderingStats* stats);
protected:
class Worker : public base::Thread {
public:
Worker(WorkerPool* worker_pool, const std::string name);
virtual ~Worker();
// This must be called before the destructor.
void StopAfterCompletingAllPendingTasks();
// Posts a task to the worker thread.
void PostTask(scoped_ptr<internal::WorkerPoolTask> task);
int num_pending_tasks() const { return pending_tasks_.size(); }
void set_record_rendering_stats(bool record_rendering_stats) {
record_rendering_stats_ = record_rendering_stats;
}
const RenderingStats* rendering_stats() const {
return rendering_stats_.get();
}
// Overridden from base::Thread:
virtual void Init() OVERRIDE;
private:
static void RunTask(
internal::WorkerPoolTask* task, RenderingStats* rendering_stats);
void OnTaskCompleted();
WorkerPool* worker_pool_;
base::WeakPtrFactory<Worker> weak_ptr_factory_;
ScopedPtrDeque<internal::WorkerPoolTask> pending_tasks_;
scoped_ptr<RenderingStats> rendering_stats_;
bool record_rendering_stats_;
};
explicit WorkerPool(size_t num_threads);
WorkerPool::Worker* GetWorkerForNextTask();
private:
class NumPendingTasksComparator {
public:
bool operator() (const Worker* a, const Worker* b) const {
return a->num_pending_tasks() < b->num_pending_tasks();
}
};
void DidNumPendingTasksChange();
void SortWorkersIfNeeded();
typedef std::vector<Worker*> WorkerVector;
WorkerVector workers_;
bool workers_need_sorting_;
bool shutdown_;
DISALLOW_COPY_AND_ASSIGN(WorkerPool);
};
} // namespace cc
#endif // CC_WORKER_POOL_H_
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