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편집 파일: timer.c
/* -*- linux-c -*- * Dyninst Timer Functions * Copyright (C) 2012 Red Hat Inc. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _STAPDYN_TIMER_C_ #define _STAPDYN_TIMER_C_ #include <signal.h> #include <time.h> #ifndef NSEC_PER_SEC #define NSEC_PER_SEC 1000000000L #endif struct stap_hrtimer_probe { struct sigevent sigev; timer_t timer_id; struct itimerspec its; const struct stap_probe * const probe; int64_t intrv; int64_t rnd; }; static void _stp_hrtimer_init(void) { return; } static int _stp_hrtimer_start(struct stap_hrtimer_probe *shp) { /* Specify a timer with the correct initial value (possibly * randomized a bit). * * If this isn't a randomized timer probe, go ahead and set * up the repeating interval values. * * The probe's interval is in nanoseconds, * but in a int64_t. So, break it down into seconds and * (leftover) nanoseconds so it will fit in a 'struct * timespec'. */ if (shp->rnd == 0) { shp->its.it_value.tv_sec = (shp->its.it_interval.tv_sec \ = shp->intrv / NSEC_PER_SEC); shp->its.it_value.tv_nsec = (shp->its.it_interval.tv_nsec \ = shp->intrv % NSEC_PER_SEC); } else { int64_t i = shp->intrv + _stp_random_u(shp->rnd); shp->its.it_value.tv_sec = i / NSEC_PER_SEC; shp->its.it_value.tv_nsec = i % NSEC_PER_SEC; } return timer_settime(shp->timer_id, 0, &shp->its, NULL); } static int _stp_hrtimer_create(struct stap_hrtimer_probe *shp, void (*function)(sigval_t)) { int rc; /* Create the timer. */ shp->sigev.sigev_notify = SIGEV_THREAD; shp->sigev.sigev_value.sival_ptr = shp; shp->sigev.sigev_notify_function = function; shp->sigev.sigev_notify_attributes = NULL; return timer_create(CLOCK_MONOTONIC, &shp->sigev, &shp->timer_id); } static void _stp_hrtimer_update(struct stap_hrtimer_probe *shp) { int64_t i = shp->intrv; /* The timer only needs updating if this is a randomized timer * probe */ if (shp->rnd == 0) return; /* The probe's interval is in nanoseconds, but in a * int64_t. So, break it down into seconds and (leftover) * nanoseconds. */ i += _stp_random_u(shp->rnd); shp->its.it_value.tv_sec = i / NSEC_PER_SEC; shp->its.it_value.tv_nsec = i % NSEC_PER_SEC; timer_settime(shp->timer_id, 0, &shp->its, NULL); } static void _stp_hrtimer_cancel(struct stap_hrtimer_probe *shp) { shp->its.it_value.tv_sec = 0; shp->its.it_value.tv_nsec = 0; timer_settime(shp->timer_id, 0, &shp->its, NULL); } static void _stp_hrtimer_delete(struct stap_hrtimer_probe *shp) { (void) timer_delete(shp->timer_id); } #endif /* _STAPDYN_TIMER_C_ */