1 /* 2 * Copyright (C) 2014 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 #ifndef ANDROID_AUDIO_FAST_THREAD_H 18 #define ANDROID_AUDIO_FAST_THREAD_H 19 20 #include "Configuration.h" 21 #ifdef CPU_FREQUENCY_STATISTICS 22 #include <cpustats/ThreadCpuUsage.h> 23 #endif 24 #include <utils/Thread.h> 25 #include "FastThreadState.h" 26 27 namespace android { 28 29 // FastThread is the common abstract base class of FastMixer and FastCapture 30 class FastThread : public Thread { 31 32 public: 33 FastThread(); 34 virtual ~FastThread(); 35 36 private: 37 // implement Thread::threadLoop() 38 virtual bool threadLoop(); 39 40 protected: 41 // callouts to subclass in same lexical order as they were in original FastMixer.cpp 42 // FIXME need comments 43 virtual const FastThreadState *poll() = 0; 44 virtual void setLog(NBLog::Writer *logWriter __unused) { } 45 virtual void onIdle() = 0; 46 virtual void onExit() = 0; 47 virtual bool isSubClassCommand(FastThreadState::Command command) = 0; 48 virtual void onStateChange() = 0; 49 virtual void onWork() = 0; 50 51 // FIXME these former local variables need comments and to be renamed to have an "m" prefix 52 const FastThreadState *previous; 53 const FastThreadState *current; 54 struct timespec oldTs; 55 bool oldTsValid; 56 long sleepNs; // -1: busy wait, 0: sched_yield, > 0: nanosleep 57 long periodNs; // expected period; the time required to render one mix buffer 58 long underrunNs; // underrun likely when write cycle is greater than this value 59 long overrunNs; // overrun likely when write cycle is less than this value 60 long forceNs; // if overrun detected, force the write cycle to take this much time 61 long warmupNs; // warmup complete when write cycle is greater than to this value 62 FastThreadDumpState *mDummyDumpState; 63 FastThreadDumpState *dumpState; 64 bool ignoreNextOverrun; // used to ignore initial overrun and first after an underrun 65 #ifdef FAST_MIXER_STATISTICS 66 struct timespec oldLoad; // previous value of clock_gettime(CLOCK_THREAD_CPUTIME_ID) 67 bool oldLoadValid; // whether oldLoad is valid 68 uint32_t bounds; 69 bool full; // whether we have collected at least mSamplingN samples 70 #ifdef CPU_FREQUENCY_STATISTICS 71 ThreadCpuUsage tcu; // for reading the current CPU clock frequency in kHz 72 #endif 73 #endif 74 unsigned coldGen; // last observed mColdGen 75 bool isWarm; // true means ready to mix, false means wait for warmup before mixing 76 struct timespec measuredWarmupTs; // how long did it take for warmup to complete 77 uint32_t warmupCycles; // counter of number of loop cycles required to warmup 78 NBLog::Writer dummyLogWriter; 79 NBLog::Writer *logWriter; 80 status_t timestampStatus; 81 82 FastThreadState::Command command; 83 #if 0 84 size_t frameCount; 85 #endif 86 bool attemptedWrite; 87 88 }; // class FastThread 89 90 } // android 91 92 #endif // ANDROID_AUDIO_FAST_THREAD_H 93
