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140 lines
3.5 KiB
140 lines
3.5 KiB
/*
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* Copyright (C) 2012 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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#define LOG_TAG "AudioWatchdog"
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//#define LOG_NDEBUG 0
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#include "Configuration.h"
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#include <utils/Log.h>
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#include "AudioWatchdog.h"
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#ifdef AUDIO_WATCHDOG
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namespace android {
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void AudioWatchdogDump::dump(int fd)
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{
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char buf[32];
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if (mMostRecent != 0) {
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// includes NUL terminator
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ctime_r(&mMostRecent, buf);
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} else {
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strcpy(buf, "N/A\n");
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}
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dprintf(fd, "Watchdog: underruns=%u, logs=%u, most recent underrun log at %s",
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mUnderruns, mLogs, buf);
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}
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bool AudioWatchdog::threadLoop()
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{
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{
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AutoMutex _l(mMyLock);
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if (mPaused) {
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mMyCond.wait(mMyLock);
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// ignore previous timestamp after resume()
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mOldTsValid = false;
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// force an immediate log on first underrun after resume()
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mLogTs.tv_sec = MIN_TIME_BETWEEN_LOGS_SEC;
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mLogTs.tv_nsec = 0;
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// caller will check for exitPending()
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return true;
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}
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}
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struct timespec newTs;
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int rc = clock_gettime(CLOCK_MONOTONIC, &newTs);
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if (rc != 0) {
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pause();
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return false;
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}
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if (!mOldTsValid) {
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mOldTs = newTs;
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mOldTsValid = true;
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return true;
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}
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time_t sec = newTs.tv_sec - mOldTs.tv_sec;
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long nsec = newTs.tv_nsec - mOldTs.tv_nsec;
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if (nsec < 0) {
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--sec;
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nsec += 1000000000;
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}
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mOldTs = newTs;
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// cycleNs is same as sec*1e9 + nsec, but limited to about 4 seconds
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uint32_t cycleNs = nsec;
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if (sec > 0) {
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if (sec < 4) {
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cycleNs += sec * 1000000000;
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} else {
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cycleNs = 4000000000u;
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}
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}
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mLogTs.tv_sec += sec;
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if ((mLogTs.tv_nsec += nsec) >= 1000000000) {
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mLogTs.tv_sec++;
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mLogTs.tv_nsec -= 1000000000;
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}
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if (cycleNs > mMaxCycleNs) {
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mDump->mUnderruns = ++mUnderruns;
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if (mLogTs.tv_sec >= MIN_TIME_BETWEEN_LOGS_SEC) {
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mDump->mLogs = ++mLogs;
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mDump->mMostRecent = time(NULL);
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ALOGW("Insufficient CPU for load: expected=%.1f actual=%.1f ms; underruns=%u logs=%u",
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mPeriodNs * 1e-6, cycleNs * 1e-6, mUnderruns, mLogs);
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mLogTs.tv_sec = 0;
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mLogTs.tv_nsec = 0;
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}
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}
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struct timespec req;
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req.tv_sec = 0;
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req.tv_nsec = mPeriodNs;
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rc = nanosleep(&req, NULL);
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if (!((rc == 0) || (rc == -1 && errno == EINTR))) {
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pause();
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return false;
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}
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return true;
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}
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void AudioWatchdog::requestExit()
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{
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// must be in this order to avoid a race condition
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Thread::requestExit();
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resume();
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}
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void AudioWatchdog::pause()
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{
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AutoMutex _l(mMyLock);
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mPaused = true;
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}
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void AudioWatchdog::resume()
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{
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AutoMutex _l(mMyLock);
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if (mPaused) {
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mPaused = false;
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mMyCond.signal();
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}
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}
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void AudioWatchdog::setDump(AudioWatchdogDump *dump)
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{
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mDump = dump != NULL ? dump : &mDummyDump;
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}
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} // namespace android
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#endif // AUDIO_WATCHDOG
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