FastThread.h revision 2234002b0710c8db73f82d397cb945cd541c6bbb 
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
27namespace android {
28
29// FastThread is the common abstract base class of FastMixer and FastCapture
30class FastThread : public Thread {
31
32public:
33            FastThread();
34    virtual ~FastThread();
35
36private:
37    // implement Thread::threadLoop()
38    virtual bool threadLoop();
39
40protected:
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