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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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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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#ifndef FLUTTER_FML_SHARED_THREAD_MERGER_H_
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#define FLUTTER_FML_SHARED_THREAD_MERGER_H_
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#include <condition_variable>
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#include <mutex>
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#include "flutter/fml/macros.h"
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#include "flutter/fml/memory/ref_counted.h"
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#include "flutter/fml/message_loop_task_queues.h"
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namespace fml {
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class RasterThreadMerger;
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typedef void* RasterThreadMergerId;
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/// Instance of this class is shared between multiple |RasterThreadMerger|
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/// instances, Most of the callings from |RasterThreadMerger| will be redirected
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/// to this class with one more caller parameter.
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class SharedThreadMerger
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: public fml::RefCountedThreadSafe<SharedThreadMerger> {
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public:
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SharedThreadMerger(TaskQueueId owner, TaskQueueId subsumed);
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// It's called by |RasterThreadMerger::MergeWithLease|.
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// See the doc of |RasterThreadMerger::MergeWithLease|.
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bool MergeWithLease(RasterThreadMergerId caller, size_t lease_term);
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// It's called by |RasterThreadMerger::UnMergeNowIfLastOne|.
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// See the doc of |RasterThreadMerger::UnMergeNowIfLastOne|.
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bool UnMergeNowIfLastOne(RasterThreadMergerId caller);
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// It's called by |RasterThreadMerger::ExtendLeaseTo|.
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// See the doc of |RasterThreadMerger::ExtendLeaseTo|.
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void ExtendLeaseTo(RasterThreadMergerId caller, size_t lease_term);
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// It's called by |RasterThreadMerger::IsMergedUnSafe|.
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// See the doc of |RasterThreadMerger::IsMergedUnSafe|.
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bool IsMergedUnSafe() const;
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// It's called by |RasterThreadMerger::IsEnabledUnSafe|.
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// See the doc of |RasterThreadMerger::IsEnabledUnSafe|.
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bool IsEnabledUnSafe() const;
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// It's called by |RasterThreadMerger::Enable| or
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// |RasterThreadMerger::Disable|.
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void SetEnabledUnSafe(bool enabled);
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// It's called by |RasterThreadMerger::DecrementLease|.
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// See the doc of |RasterThreadMerger::DecrementLease|.
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bool DecrementLease(RasterThreadMergerId caller);
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private:
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fml::TaskQueueId owner_;
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fml::TaskQueueId subsumed_;
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fml::MessageLoopTaskQueues* task_queues_;
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std::mutex mutex_;
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bool enabled_;
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/// The |MergeWithLease| or |ExtendLeaseTo| method will record the caller
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/// into this lease_term_by_caller_ map, |UnMergeNowIfLastOne|
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/// method will remove the caller from this lease_term_by_caller_.
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std::map<RasterThreadMergerId, std::atomic_size_t> lease_term_by_caller_;
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bool IsAllLeaseTermsZeroUnSafe() const;
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bool UnMergeNowUnSafe();
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FML_DISALLOW_COPY_AND_ASSIGN(SharedThreadMerger);
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};
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} // namespace fml
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#endif // FLUTTER_FML_SHARED_THREAD_MERGER_H_
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