| /* |
| * 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. |
| */ |
| |
| #include <stdint.h> |
| |
| #include <common_time/cc_helper.h> |
| #include <common_time/ICommonClock.h> |
| #include <utils/threads.h> |
| |
| namespace android { |
| |
| Mutex CCHelper::lock_; |
| sp<ICommonClock> CCHelper::common_clock_; |
| sp<ICommonClockListener> CCHelper::common_clock_listener_; |
| uint32_t CCHelper::ref_count_ = 0; |
| |
| bool CCHelper::verifyClock_l() { |
| bool ret = false; |
| |
| if (common_clock_ == NULL) { |
| common_clock_ = ICommonClock::getInstance(); |
| if (common_clock_ == NULL) |
| goto bailout; |
| } |
| |
| if (ref_count_ > 0) { |
| if (common_clock_listener_ == NULL) { |
| common_clock_listener_ = new CommonClockListener(); |
| if (common_clock_listener_ == NULL) |
| goto bailout; |
| |
| if (OK != common_clock_->registerListener(common_clock_listener_)) |
| goto bailout; |
| } |
| } |
| |
| ret = true; |
| |
| bailout: |
| if (!ret) { |
| common_clock_listener_ = NULL; |
| common_clock_ = NULL; |
| } |
| return ret; |
| } |
| |
| CCHelper::CCHelper() { |
| Mutex::Autolock lock(&lock_); |
| ref_count_++; |
| verifyClock_l(); |
| } |
| |
| CCHelper::~CCHelper() { |
| Mutex::Autolock lock(&lock_); |
| |
| assert(ref_count_ > 0); |
| ref_count_--; |
| |
| // If we were the last CCHelper instance in the system, and we had |
| // previously register a listener, unregister it now so that the common time |
| // service has the chance to go into auto-disabled mode. |
| if (!ref_count_ && |
| (common_clock_ != NULL) && |
| (common_clock_listener_ != NULL)) { |
| common_clock_->unregisterListener(common_clock_listener_); |
| common_clock_listener_ = NULL; |
| } |
| } |
| |
| void CCHelper::CommonClockListener::onTimelineChanged(uint64_t timelineID __unused) { |
| // do nothing; listener is only really used as a token so the server can |
| // find out when clients die. |
| } |
| |
| // Helper methods which attempts to make calls to the common time binder |
| // service. If the first attempt fails with DEAD_OBJECT, the helpers will |
| // attempt to make a connection to the service again (assuming that the process |
| // hosting the service had crashed and the client proxy we are holding is dead) |
| // If the second attempt fails, or no connection can be made, the we let the |
| // error propagate up the stack and let the caller deal with the situation as |
| // best they can. |
| #define CCHELPER_METHOD(decl, call) \ |
| status_t CCHelper::decl { \ |
| Mutex::Autolock lock(&lock_); \ |
| \ |
| if (!verifyClock_l()) \ |
| return DEAD_OBJECT; \ |
| \ |
| status_t status = common_clock_->call; \ |
| if (DEAD_OBJECT == status) { \ |
| if (!verifyClock_l()) \ |
| return DEAD_OBJECT; \ |
| status = common_clock_->call; \ |
| } \ |
| \ |
| return status; \ |
| } |
| |
| #define VERIFY_CLOCK() |
| |
| CCHELPER_METHOD(isCommonTimeValid(bool* valid, uint32_t* timelineID), |
| isCommonTimeValid(valid, timelineID)) |
| CCHELPER_METHOD(commonTimeToLocalTime(int64_t commonTime, int64_t* localTime), |
| commonTimeToLocalTime(commonTime, localTime)) |
| CCHELPER_METHOD(localTimeToCommonTime(int64_t localTime, int64_t* commonTime), |
| localTimeToCommonTime(localTime, commonTime)) |
| CCHELPER_METHOD(getCommonTime(int64_t* commonTime), |
| getCommonTime(commonTime)) |
| CCHELPER_METHOD(getCommonFreq(uint64_t* freq), |
| getCommonFreq(freq)) |
| CCHELPER_METHOD(getLocalTime(int64_t* localTime), |
| getLocalTime(localTime)) |
| CCHELPER_METHOD(getLocalFreq(uint64_t* freq), |
| getLocalFreq(freq)) |
| |
| } // namespace android |