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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_RESOURCES_RASTER_WORKER_POOL_H_
#define CC_RESOURCES_RASTER_WORKER_POOL_H_
#include "cc/base/worker_pool.h"
namespace cc {
class PicturePileImpl;
// A worker thread pool that runs raster tasks.
class CC_EXPORT RasterWorkerPool : public WorkerPool {
public:
class Task {
public:
typedef base::Callback<void(bool)> Reply;
// Highest priority task first. Order of execution is not guaranteed.
class Queue {
public:
Queue();
~Queue();
bool empty() const { return tasks_.empty(); }
// Add task to the back of the queue.
void Append(const Task& task);
private:
friend class RasterWorkerPool;
internal::WorkerPoolTask::TaskVector tasks_;
};
Task();
Task(const base::Closure& callback, const Reply& reply);
explicit Task(Queue* dependencies);
~Task();
// Returns true if Task is null (doesn't refer to anything).
bool is_null() const { return !internal_.get(); }
// Returns the Task into an uninitialized state.
void Reset();
protected:
friend class RasterWorkerPool;
explicit Task(scoped_refptr<internal::WorkerPoolTask> internal);
scoped_refptr<internal::WorkerPoolTask> internal_;
};
class PictureTask : public Task {
public:
typedef base::Callback<void(PicturePileImpl*)> Callback;
PictureTask(PicturePileImpl* picture_pile,
const Callback& callback,
const Reply& reply,
Queue* dependencies);
};
virtual ~RasterWorkerPool();
static scoped_ptr<RasterWorkerPool> Create(size_t num_threads) {
return make_scoped_ptr(new RasterWorkerPool(num_threads));
}
// Tells the worker pool to shutdown after canceling all previously
// scheduled tasks. Reply callbacks are still guaranteed to run.
virtual void Shutdown() OVERRIDE;
// Schedule running of |root| task and all its dependencies. Tasks
// previously scheduled but no longer needed to run |root| will be
// canceled unless already running. Once scheduled, reply callbacks
// are guaranteed to run for all tasks even if they later get
// canceled by another call to ScheduleTasks().
void ScheduleTasks(Task* root);
private:
explicit RasterWorkerPool(size_t num_threads);
DISALLOW_COPY_AND_ASSIGN(RasterWorkerPool);
};
} // namespace cc
#endif // CC_RESOURCES_RASTER_WORKER_POOL_H_
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