Method start

libapp2sys/src/main/cpp/procutil.h:202–230

public:
    int start(uint32_t linuxTid, uint64_t sampleRateMS = 15) {
        m_startUnixTime = getMillisecond();
        m_sumCpuLoad = 0;
        m_linuxTid = linuxTid;
        m_sampleRateUS = sampleRateMS * 1000;

        if (CPU_COUNT <= 0 || m_linuxTid <= 0) {
            return -1;
        }

        char buf[64];
        m_ppCpuFfreqReader = new ProcFileReader *[CPU_COUNT];
        for (int i = 0; i < CPU_COUNT; i++) {
            sprintf(buf, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_cur_freq", i);
            m_ppCpuFfreqReader[i] = new ProcFileReader(buf);
        }
        sprintf(buf, "/proc/self/task/%d/stat", m_linuxTid);
        m_pStatReader = new ProcFileReader(buf);
        m_pStatReader->update();
        m_lastJiffies = m_pStatReader->getValue(STAT_USER_JIFFIES_INDEX) + m_pStatReader->getValue(STAT_SYS_JIFFIES_INDEX);

        if (m_lastJiffies < 0) {
            return -2;
        }

        m_running = 1;
        pthread_create(&m_thr, NULL, monitorThread, this);
        return 0;
    }

    int stop(uint64_t &runUnixTime, uint64_t &cpuLoad) {
        runUnixTime = getMillisecond() - m_startUnixTime;