1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 #ifndef ANDROID_TIME_CHECK_H 19 #define ANDROID_TIME_CHECK_H 20 21 #include <utils/KeyedVector.h> 22 #include <utils/Thread.h> 23 24 25 namespace android { 26 27 // A class monitoring execution time for a code block (scoped variable) and causing an assert 28 // if it exceeds a certain time 29 30 class TimeCheck { 31 public: 32 33 // The default timeout is chosen to be less than system server watchdog timeout 34 static constexpr uint32_t kDefaultTimeOutMs = 5000; 35 36 TimeCheck(const char *tag, uint32_t timeoutMs = kDefaultTimeOutMs); 37 ~TimeCheck(); 38 39 private: 40 41 class TimeCheckThread : public Thread { 42 public: 43 TimeCheckThread()44 TimeCheckThread() {} 45 virtual ~TimeCheckThread() override; 46 47 nsecs_t startMonitoring(const char *tag, uint32_t timeoutMs); 48 void stopMonitoring(nsecs_t endTimeNs); 49 50 private: 51 52 // RefBase onFirstRef()53 virtual void onFirstRef() override { run("TimeCheckThread", PRIORITY_URGENT_AUDIO); } 54 55 // Thread 56 virtual bool threadLoop() override; 57 58 Condition mCond; 59 Mutex mMutex; 60 // using the end time in ns as key is OK given the risk is low that two entries 61 // are added in such a way that <add time> + <timeout> are the same for both. 62 KeyedVector< nsecs_t, const char*> mMonitorRequests; 63 }; 64 65 static sp<TimeCheckThread> getTimeCheckThread(); 66 67 const nsecs_t mEndTimeNs; 68 }; 69 70 }; // namespace android 71 72 #endif // ANDROID_TIME_CHECK_H 73