116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
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* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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* Copyright (C) 2012-2014 Cisco Systems
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include <kern_util.h>
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#include <os.h>
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#include <string.h>
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static timer_t event_high_res_timer = 0;
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static inline long long timespec_to_ns(const struct timespec *ts)
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{
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return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec;
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}
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long long os_persistent_clock_emulation(void)
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{
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struct timespec realtime_tp;
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clock_gettime(CLOCK_REALTIME, &realtime_tp);
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return timespec_to_ns(&realtime_tp);
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}
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/**
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* os_timer_create() - create an new posix (interval) timer
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*/
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int os_timer_create(void)
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{
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timer_t *t = &event_high_res_timer;
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if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1)
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return -1;
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return 0;
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}
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int os_timer_set_interval(unsigned long long nsecs)
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{
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struct itimerspec its;
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its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC;
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its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC;
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its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC;
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its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC;
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if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1)
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return -errno;
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return 0;
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}
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int os_timer_one_shot(unsigned long long nsecs)
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{
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struct itimerspec its = {
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.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC,
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.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC,
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.it_interval.tv_sec = 0,
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.it_interval.tv_nsec = 0, // we cheat here
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};
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timer_settime(event_high_res_timer, 0, &its, NULL);
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return 0;
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}
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/**
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* os_timer_disable() - disable the posix (interval) timer
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*/
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void os_timer_disable(void)
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{
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struct itimerspec its;
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memset(&its, 0, sizeof(struct itimerspec));
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timer_settime(event_high_res_timer, 0, &its, NULL);
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}
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long long os_nsecs(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC,&ts);
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return timespec_to_ns(&ts);
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}
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/**
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* os_idle_sleep() - sleep until interrupted
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*/
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void os_idle_sleep(void)
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{
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struct itimerspec its;
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sigset_t set, old;
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/* block SIGALRM while we analyze the timer state */
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sigemptyset(&set);
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sigaddset(&set, SIGALRM);
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sigprocmask(SIG_BLOCK, &set, &old);
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/* check the timer, and if it'll fire then wait for it */
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timer_gettime(event_high_res_timer, &its);
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if (its.it_value.tv_sec || its.it_value.tv_nsec)
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sigsuspend(&old);
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/* either way, restore the signal mask */
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sigprocmask(SIG_UNBLOCK, &set, NULL);
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}
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