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