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61 lines
2.4 KiB
61 lines
2.4 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _UI_INPUT_INPUTDISPATCHER_ANRTRACKER_H
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#define _UI_INPUT_INPUTDISPATCHER_ANRTRACKER_H
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#include <binder/IBinder.h>
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#include <utils/Timers.h>
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#include <set>
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namespace android::inputdispatcher {
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/**
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* Keeps track of the times when each connection is going to ANR.
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* Provides the ability to quickly find the connection that is going to cause ANR next.
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*/
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class AnrTracker {
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public:
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void insert(nsecs_t timeoutTime, sp<IBinder> token);
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void erase(nsecs_t timeoutTime, const sp<IBinder>& token);
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void eraseToken(const sp<IBinder>& token);
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void clear();
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bool empty() const;
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// If empty() is false, return the time at which the next connection should cause an ANR
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// If empty() is true, return LONG_LONG_MAX
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nsecs_t firstTimeout() const;
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// Return the token of the next connection that should cause an ANR.
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// Do not call this unless empty() is false, you will encounter undefined behaviour.
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const sp<IBinder>& firstToken() const;
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private:
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// Optimization: use a multiset to keep track of the event timeouts. When an event is sent
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// to the InputConsumer, we add an entry to this structure. We look at the smallest value to
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// determine if any of the connections is unresponsive, and to determine when we should wake
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// next for the future ANR check.
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// Using a multiset helps quickly look up the next timeout due.
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//
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// We must use a multi-set, because it is plausible (although highly unlikely) to have entries
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// from the same connection and same timestamp, but different sequence numbers.
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// We are not tracking sequence numbers, and just allow duplicates to exist.
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std::multiset<std::pair<nsecs_t /*timeoutTime*/, sp<IBinder> /*connectionToken*/>> mAnrTimeouts;
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};
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} // namespace android::inputdispatcher
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#endif // _UI_INPUT_INPUTDISPATCHER_ANRTRACKER_H
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