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* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkTaskGroup_DEFINED
#define SkTaskGroup_DEFINED
#include "SkExecutor.h"
#include "SkTypes.h"
#include <atomic>
#include <functional>
class SkTaskGroup : SkNoncopyable {
// Tasks added to this SkTaskGroup will run on its executor.
explicit SkTaskGroup(SkExecutor& executor = SkExecutor::GetDefault());
~SkTaskGroup() { this->wait(); }
// Add a task to this SkTaskGroup.
void add(std::function<void(void)> fn);
// Add a batch of N tasks, all calling fn with different arguments.
void batch(int N, std::function<void(int)> fn);
// Block until all Tasks previously add()ed to this SkTaskGroup have run.
// You may safely reuse this SkTaskGroup after wait() returns.
void wait();
// A convenience for testing tools.
// Creates and owns a thread pool, and passes it to SkExecutor::SetDefault().
struct Enabler {
explicit Enabler(int threads = -1); // -1 -> num_cores, 0 -> noop
std::unique_ptr<SkExecutor> fThreadPool;
std::atomic<int32_t> fPending;
SkExecutor& fExecutor;