ad3dea12ee
* Add explicit keyword to conversion constructors. Bug: 28341362 Test: build with WITH_TIDY=1 Change-Id: Ieab4756042e77cfadda35e34f78f515058ae0bb3
92 lines
3.8 KiB
C++
92 lines
3.8 KiB
C++
/*
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* Copyright (C) 2011 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 ANDROID_COMMON_CLOCK_SERVICE_H
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#define ANDROID_COMMON_CLOCK_SERVICE_H
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#include <sys/socket.h>
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#include <common_time/ICommonClock.h>
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namespace android {
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class CommonTimeServer;
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class CommonClockService : public BnCommonClock,
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public android::IBinder::DeathRecipient {
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public:
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static sp<CommonClockService> instantiate(CommonTimeServer& timeServer);
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virtual status_t dump(int fd, const Vector<String16>& args);
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virtual status_t isCommonTimeValid(bool* valid, uint32_t *timelineID);
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virtual status_t commonTimeToLocalTime(int64_t common_time,
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int64_t* local_time);
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virtual status_t localTimeToCommonTime(int64_t local_time,
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int64_t* common_time);
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virtual status_t getCommonTime(int64_t* common_time);
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virtual status_t getCommonFreq(uint64_t* freq);
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virtual status_t getLocalTime(int64_t* local_time);
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virtual status_t getLocalFreq(uint64_t* freq);
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virtual status_t getEstimatedError(int32_t* estimate);
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virtual status_t getTimelineID(uint64_t* id);
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virtual status_t getState(ICommonClock::State* state);
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virtual status_t getMasterAddr(struct sockaddr_storage* addr);
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virtual status_t registerListener(
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const sp<ICommonClockListener>& listener);
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virtual status_t unregisterListener(
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const sp<ICommonClockListener>& listener);
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void notifyOnTimelineChanged(uint64_t timelineID);
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private:
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explicit CommonClockService(CommonTimeServer& timeServer)
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: mTimeServer(timeServer) { };
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virtual void binderDied(const wp<IBinder>& who);
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CommonTimeServer& mTimeServer;
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// locks used to synchronize access to the list of registered listeners.
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// The callback lock is held whenever the list is used to perform callbacks
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// or while the list is being modified. The registration lock used to
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// serialize access across registerListener, unregisterListener, and
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// binderDied.
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//
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// The reason for two locks is that registerListener, unregisterListener,
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// and binderDied each call into the core service and obtain the core
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// service thread lock when they call reevaluateAutoDisableState. The core
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// service thread obtains the main thread lock whenever its thread is
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// running, and sometimes needs to call notifyOnTimelineChanged which then
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// obtains the callback lock. If callers of registration functions were
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// holding the callback lock when they called into the core service, we
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// would have a classic A/B, B/A ordering deadlock. To avoid this, the
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// registration functions hold the registration lock for the duration of
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// their call, but hold the callback lock only while they mutate the list.
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// This way, the list's size cannot change (because of the registration
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// lock) during the call into reevaluateAutoDisableState, but the core work
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// thread can still safely call notifyOnTimelineChanged while holding the
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// main thread lock.
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Mutex mCallbackLock;
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Mutex mRegistrationLock;
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Vector<sp<ICommonClockListener> > mListeners;
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};
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}; // namespace android
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#endif // ANDROID_COMMON_CLOCK_SERVICE_H
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