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      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 
     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
     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