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142 lines
4.5 KiB
142 lines
4.5 KiB
/*
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* Copyright (C) 2018 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 "TimeCheck"
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#include <utils/Log.h>
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#include <mediautils/TimeCheck.h>
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#include <mediautils/EventLog.h>
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#include "debuggerd/handler.h"
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namespace android {
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// Audio HAL server pids vector used to generate audio HAL processes tombstone
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// when audioserver watchdog triggers.
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// We use a lockless storage to avoid potential deadlocks in the context of watchdog
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// trigger.
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// Protection again simultaneous writes is not needed given one update takes place
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// during AudioFlinger construction and other comes necessarily later once the IAudioFlinger
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// interface is available.
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// The use of an atomic index just guaranties that current vector is fully initialized
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// when read.
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/* static */
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void TimeCheck::accessAudioHalPids(std::vector<pid_t>* pids, bool update) {
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static constexpr int kNumAudioHalPidsVectors = 3;
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static std::vector<pid_t> audioHalPids[kNumAudioHalPidsVectors];
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static std::atomic<int> curAudioHalPids = 0;
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if (update) {
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audioHalPids[(curAudioHalPids++ + 1) % kNumAudioHalPidsVectors] = *pids;
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} else {
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*pids = audioHalPids[curAudioHalPids % kNumAudioHalPidsVectors];
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}
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}
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/* static */
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void TimeCheck::setAudioHalPids(const std::vector<pid_t>& pids) {
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accessAudioHalPids(&(const_cast<std::vector<pid_t>&>(pids)), true);
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}
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/* static */
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std::vector<pid_t> TimeCheck::getAudioHalPids() {
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std::vector<pid_t> pids;
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accessAudioHalPids(&pids, false);
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return pids;
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}
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/* static */
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sp<TimeCheck::TimeCheckThread> TimeCheck::getTimeCheckThread()
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{
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static sp<TimeCheck::TimeCheckThread> sTimeCheckThread = new TimeCheck::TimeCheckThread();
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return sTimeCheckThread;
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}
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TimeCheck::TimeCheck(const char *tag, uint32_t timeoutMs)
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: mEndTimeNs(getTimeCheckThread()->startMonitoring(tag, timeoutMs))
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{
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}
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TimeCheck::~TimeCheck() {
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getTimeCheckThread()->stopMonitoring(mEndTimeNs);
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}
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TimeCheck::TimeCheckThread::~TimeCheckThread()
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{
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AutoMutex _l(mMutex);
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requestExit();
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mMonitorRequests.clear();
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mCond.signal();
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}
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nsecs_t TimeCheck::TimeCheckThread::startMonitoring(const char *tag, uint32_t timeoutMs) {
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Mutex::Autolock _l(mMutex);
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nsecs_t endTimeNs = systemTime() + milliseconds(timeoutMs);
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for (; mMonitorRequests.indexOfKey(endTimeNs) >= 0; ++endTimeNs);
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mMonitorRequests.add(endTimeNs, tag);
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mCond.signal();
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return endTimeNs;
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}
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void TimeCheck::TimeCheckThread::stopMonitoring(nsecs_t endTimeNs) {
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Mutex::Autolock _l(mMutex);
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mMonitorRequests.removeItem(endTimeNs);
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mCond.signal();
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}
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bool TimeCheck::TimeCheckThread::threadLoop()
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{
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status_t status = TIMED_OUT;
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{
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AutoMutex _l(mMutex);
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if (exitPending()) {
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return false;
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}
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nsecs_t endTimeNs = INT64_MAX;
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const char *tag = "<unspecified>";
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// KeyedVector mMonitorRequests is ordered so take first entry as next timeout
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if (mMonitorRequests.size() != 0) {
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endTimeNs = mMonitorRequests.keyAt(0);
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tag = mMonitorRequests.valueAt(0);
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}
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const nsecs_t waitTimeNs = endTimeNs - systemTime();
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if (waitTimeNs > 0) {
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status = mCond.waitRelative(mMutex, waitTimeNs);
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}
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if (status != NO_ERROR) {
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// Generate audio HAL processes tombstones and allow time to complete
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// before forcing restart
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std::vector<pid_t> pids = getAudioHalPids();
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if (pids.size() != 0) {
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for (const auto& pid : pids) {
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ALOGI("requesting tombstone for pid: %d", pid);
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sigqueue(pid, DEBUGGER_SIGNAL, {.sival_int = 0});
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}
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sleep(1);
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} else {
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ALOGI("No HAL process pid available, skipping tombstones");
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}
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LOG_EVENT_STRING(LOGTAG_AUDIO_BINDER_TIMEOUT, tag);
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LOG_ALWAYS_FATAL("TimeCheck timeout for %s", tag);
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}
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}
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return true;
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}
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}; // namespace android
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