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-rw-r--r--services/common_time/common_clock_service.h91
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diff --git a/services/common_time/common_clock_service.h b/services/common_time/common_clock_service.h
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--- a/services/common_time/common_clock_service.h
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-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_COMMON_CLOCK_SERVICE_H
-#define ANDROID_COMMON_CLOCK_SERVICE_H
-
-#include <sys/socket.h>
-#include <common_time/ICommonClock.h>
-
-namespace android {
-
-class CommonTimeServer;
-
-class CommonClockService : public BnCommonClock,
- public android::IBinder::DeathRecipient {
- public:
- static sp<CommonClockService> instantiate(CommonTimeServer& timeServer);
-
- virtual status_t dump(int fd, const Vector<String16>& args);
-
- virtual status_t isCommonTimeValid(bool* valid, uint32_t *timelineID);
- virtual status_t commonTimeToLocalTime(int64_t common_time,
- int64_t* local_time);
- virtual status_t localTimeToCommonTime(int64_t local_time,
- int64_t* common_time);
- virtual status_t getCommonTime(int64_t* common_time);
- virtual status_t getCommonFreq(uint64_t* freq);
- virtual status_t getLocalTime(int64_t* local_time);
- virtual status_t getLocalFreq(uint64_t* freq);
- virtual status_t getEstimatedError(int32_t* estimate);
- virtual status_t getTimelineID(uint64_t* id);
- virtual status_t getState(ICommonClock::State* state);
- virtual status_t getMasterAddr(struct sockaddr_storage* addr);
-
- virtual status_t registerListener(
- const sp<ICommonClockListener>& listener);
- virtual status_t unregisterListener(
- const sp<ICommonClockListener>& listener);
-
- void notifyOnTimelineChanged(uint64_t timelineID);
-
- private:
- CommonClockService(CommonTimeServer& timeServer)
- : mTimeServer(timeServer) { };
-
- virtual void binderDied(const wp<IBinder>& who);
-
- CommonTimeServer& mTimeServer;
-
- // locks used to synchronize access to the list of registered listeners.
- // The callback lock is held whenever the list is used to perform callbacks
- // or while the list is being modified. The registration lock used to
- // serialize access across registerListener, unregisterListener, and
- // binderDied.
- //
- // The reason for two locks is that registerListener, unregisterListener,
- // and binderDied each call into the core service and obtain the core
- // service thread lock when they call reevaluateAutoDisableState. The core
- // service thread obtains the main thread lock whenever its thread is
- // running, and sometimes needs to call notifyOnTimelineChanged which then
- // obtains the callback lock. If callers of registration functions were
- // holding the callback lock when they called into the core service, we
- // would have a classic A/B, B/A ordering deadlock. To avoid this, the
- // registration functions hold the registration lock for the duration of
- // their call, but hold the callback lock only while they mutate the list.
- // This way, the list's size cannot change (because of the registration
- // lock) during the call into reevaluateAutoDisableState, but the core work
- // thread can still safely call notifyOnTimelineChanged while holding the
- // main thread lock.
- Mutex mCallbackLock;
- Mutex mRegistrationLock;
-
- Vector<sp<ICommonClockListener> > mListeners;
-};
-
-}; // namespace android
-
-#endif // ANDROID_COMMON_CLOCK_SERVICE_H