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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_AUDIO_FAST_THREAD_STATE_H
#define ANDROID_AUDIO_FAST_THREAD_STATE_H
#include "Configuration.h"
#include <stdint.h>
#include <media/nbaio/NBLog.h>
namespace android {
struct FastThreadDumpState;
// Represents a single state of a FastThread
struct FastThreadState {
FastThreadState();
/*virtual*/ ~FastThreadState();
typedef uint32_t Command;
static const Command
INITIAL = 0, // used only for the initial state
HOT_IDLE = 1, // do nothing
COLD_IDLE = 2, // wait for the futex
IDLE = 3, // either HOT_IDLE or COLD_IDLE
EXIT = 4; // exit from thread
// additional values defined per subclass
Command mCommand; // current command
int32_t* mColdFutexAddr; // for COLD_IDLE only, pointer to the associated futex
unsigned mColdGen; // increment when COLD_IDLE is requested so it's only performed once
// This might be a one-time configuration rather than per-state
FastThreadDumpState* mDumpState; // if non-NULL, then update dump state periodically
NBLog::Writer* mNBLogWriter; // non-blocking logger
}; // struct FastThreadState
// FIXME extract common part of comment at FastMixerDumpState
struct FastThreadDumpState {
FastThreadDumpState();
/*virtual*/ ~FastThreadDumpState();
FastThreadState::Command mCommand; // current command
uint32_t mUnderruns; // total number of underruns
uint32_t mOverruns; // total number of overruns
struct timespec mMeasuredWarmupTs; // measured warmup time
uint32_t mWarmupCycles; // number of loop cycles required to warmup
#ifdef FAST_MIXER_STATISTICS
// Recently collected samples of per-cycle monotonic time, thread CPU time, and CPU frequency.
// kSamplingN is max size of sampling frame (statistics), and must be a power of 2 <= 0x8000.
// The sample arrays are virtually allocated based on this compile-time constant,
// but are only initialized and used based on the runtime parameter mSamplingN.
static const uint32_t kSamplingN = 0x8000;
// Corresponding runtime maximum size of sample arrays, must be a power of 2 <= kSamplingN.
uint32_t mSamplingN;
// The bounds define the interval of valid samples, and are represented as follows:
// newest open (excluded) endpoint = lower 16 bits of bounds, modulo N
// oldest closed (included) endpoint = upper 16 bits of bounds, modulo N
// Number of valid samples is newest - oldest.
uint32_t mBounds; // bounds for mMonotonicNs, mThreadCpuNs, and mCpukHz
// The elements in the *Ns arrays are in units of nanoseconds <= 3999999999.
uint32_t mMonotonicNs[kSamplingN]; // delta monotonic (wall clock) time
uint32_t mLoadNs[kSamplingN]; // delta CPU load in time
#ifdef CPU_FREQUENCY_STATISTICS
uint32_t mCpukHz[kSamplingN]; // absolute CPU clock frequency in kHz, bits 0-3 are CPU#
#endif
#endif
}; // struct FastThreadDumpState
} // android
#endif // ANDROID_AUDIO_FAST_THREAD_STATE_H
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