Method createForThread

src/ctimer_linux.cpp:31–63

int* CTimer::_timers = NULL;

int CTimer::createForThread(int tid) {
    if (tid >= _max_timers) {
        Log::warn("tid[%d] > pid_max[%d]. Restart profiler after changing pid_max", tid, _max_timers);
        return -1;
    }

    struct sigevent sev;
    sev.sigev_value.sival_ptr = NULL;
    sev.sigev_signo = _signal;
    sev.sigev_notify = SIGEV_THREAD_ID;
    (&sev.sigev_notify)[1] = tid;

    // Use raw syscalls, since libc wrapper allows only predefined clocks
    clockid_t clock = thread_cpu_clock(tid);
    int timer;
    if (syscall(__NR_timer_create, clock, &sev, &timer) < 0) {
        return -1;
    }

    // Kernel timer ID may start with zero, but we use zero as an empty slot
    if (!__sync_bool_compare_and_swap(&_timers[tid], 0, timer + 1)) {
        // Lost race
        syscall(__NR_timer_delete, timer);
        return -1;
    }

    struct itimerspec ts;
    ts.it_interval.tv_sec = (time_t)(_interval / 1000000000);
    ts.it_interval.tv_nsec = _interval % 1000000000;
    ts.it_value = ts.it_interval;
    syscall(__NR_timer_settime, timer, 0, &ts, NULL);
    return 0;
}

void CTimer::destroyForThread(int tid) {
    if (tid >= _max_timers) {