Add audio watchdog thread
Change-Id: I4ed62087bd6554179abb8258d2da606050e762c0
diff --git a/services/audioflinger/AudioWatchdog.cpp b/services/audioflinger/AudioWatchdog.cpp
new file mode 100644
index 0000000..8f328ee
--- /dev/null
+++ b/services/audioflinger/AudioWatchdog.cpp
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+#define LOG_TAG "AudioWatchdog"
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include "AudioWatchdog.h"
+
+namespace android {
+
+void AudioWatchdogDump::dump(int fd)
+{
+ char buf[32];
+ if (mMostRecent != 0) {
+ // includes NUL terminator
+ ctime_r(&mMostRecent, buf);
+ } else {
+ strcpy(buf, "N/A\n");
+ }
+ fdprintf(fd, "Watchdog: underruns=%u, logs=%u, most recent underrun log at %s",
+ mUnderruns, mLogs, buf);
+}
+
+bool AudioWatchdog::threadLoop()
+{
+ {
+ AutoMutex _l(mMyLock);
+ if (mPaused) {
+ mMyCond.wait(mMyLock);
+ // ignore previous timestamp after resume()
+ mOldTsValid = false;
+ // force an immediate log on first underrun after resume()
+ mLogTs.tv_sec = MIN_TIME_BETWEEN_LOGS_SEC;
+ mLogTs.tv_nsec = 0;
+ // caller will check for exitPending()
+ return true;
+ }
+ }
+ struct timespec newTs;
+ int rc = clock_gettime(CLOCK_MONOTONIC, &newTs);
+ if (rc != 0) {
+ pause();
+ return false;
+ }
+ if (!mOldTsValid) {
+ mOldTs = newTs;
+ mOldTsValid = true;
+ return true;
+ }
+ time_t sec = newTs.tv_sec - mOldTs.tv_sec;
+ long nsec = newTs.tv_nsec - mOldTs.tv_nsec;
+ if (nsec < 0) {
+ --sec;
+ nsec += 1000000000;
+ }
+ mOldTs = newTs;
+ // cycleNs is same as sec*1e9 + nsec, but limited to about 4 seconds
+ uint32_t cycleNs = nsec;
+ if (sec > 0) {
+ if (sec < 4) {
+ cycleNs += sec * 1000000000;
+ } else {
+ cycleNs = 4000000000u;
+ }
+ }
+ mLogTs.tv_sec += sec;
+ if ((mLogTs.tv_nsec += nsec) >= 1000000000) {
+ mLogTs.tv_sec++;
+ mLogTs.tv_nsec -= 1000000000;
+ }
+ if (cycleNs > mMaxCycleNs) {
+ mDump->mUnderruns = ++mUnderruns;
+ if (mLogTs.tv_sec >= MIN_TIME_BETWEEN_LOGS_SEC) {
+ mDump->mLogs = ++mLogs;
+ mDump->mMostRecent = time(NULL);
+ ALOGW("Insufficient CPU for load: expected=%.1f actual=%.1f ms; underruns=%u logs=%u",
+ mPeriodNs * 1e-6, cycleNs * 1e-6, mUnderruns, mLogs);
+ mLogTs.tv_sec = 0;
+ mLogTs.tv_nsec = 0;
+ }
+ }
+ struct timespec req;
+ req.tv_sec = 0;
+ req.tv_nsec = mPeriodNs;
+ rc = nanosleep(&req, NULL);
+ if (!((rc == 0) || (rc == -1 && errno == EINTR))) {
+ pause();
+ return false;
+ }
+ return true;
+}
+
+void AudioWatchdog::requestExit()
+{
+ // must be in this order to avoid a race condition
+ Thread::requestExit();
+ resume();
+}
+
+void AudioWatchdog::pause()
+{
+ AutoMutex _l(mMyLock);
+ mPaused = true;
+}
+
+void AudioWatchdog::resume()
+{
+ AutoMutex _l(mMyLock);
+ if (mPaused) {
+ mPaused = false;
+ mMyCond.signal();
+ }
+}
+
+void AudioWatchdog::setDump(AudioWatchdogDump *dump)
+{
+ mDump = dump != NULL ? dump : &mDummyDump;
+}
+
+} // namespace android