1/*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkTaskGroup_DEFINED
9#define SkTaskGroup_DEFINED
10
11#include "include/core/SkExecutor.h"
12#include "include/core/SkTypes.h"
13#include "include/private/SkNoncopyable.h"
14#include <atomic>
15#include <functional>
16
17class SkTaskGroup : SkNoncopyable {
18public:
19 // Tasks added to this SkTaskGroup will run on its executor.
20 explicit SkTaskGroup(SkExecutor& executor = SkExecutor::GetDefault());
21 ~SkTaskGroup() { this->wait(); }
22
23 // Add a task to this SkTaskGroup.
24 void add(std::function<void(void)> fn);
25
26 // Add a batch of N tasks, all calling fn with different arguments.
27 void batch(int N, std::function<void(int)> fn);
28
29 // Returns true if all Tasks previously add()ed to this SkTaskGroup have run.
30 // It is safe to reuse this SkTaskGroup once done().
31 bool done() const;
32
33 // Block until done().
34 void wait();
35
36 // A convenience for testing tools.
37 // Creates and owns a thread pool, and passes it to SkExecutor::SetDefault().
38 struct Enabler {
39 explicit Enabler(int threads = -1); // -1 -> num_cores, 0 -> noop
40 std::unique_ptr<SkExecutor> fThreadPool;
41 };
42
43private:
44 std::atomic<int32_t> fPending;
45 SkExecutor& fExecutor;
46};
47
48#endif//SkTaskGroup_DEFINED
49