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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.
*/
#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) {
// 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
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