2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with PulseAudio; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
32 #ifdef HAVE_SYS_PRCTL_H
33 #include <sys/prctl.h>
36 #include <pulse/timeval.h>
37 #include <pulsecore/macro.h>
38 #include <pulsecore/core-error.h>
40 #include "core-rtclock.h"
42 pa_usec_t pa_rtclock_age(const struct timeval *tv) {
46 return pa_timeval_diff(pa_rtclock_get(&now), tv);
49 struct timeval *pa_rtclock_get(struct timeval *tv) {
50 #ifdef HAVE_CLOCK_GETTIME
53 #ifdef CLOCK_MONOTONIC
54 /* No locking or atomic ops for no_monotonic here */
55 static pa_bool_t no_monotonic = FALSE;
58 if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
63 pa_assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
67 tv->tv_sec = ts.tv_sec;
68 tv->tv_usec = ts.tv_nsec / PA_NSEC_PER_USEC;
72 #else /* HAVE_CLOCK_GETTIME */
74 return pa_gettimeofday(tv);
79 pa_bool_t pa_rtclock_hrtimer(void) {
80 #ifdef HAVE_CLOCK_GETTIME
83 #ifdef CLOCK_MONOTONIC
84 if (clock_getres(CLOCK_MONOTONIC, &ts) >= 0)
85 return ts.tv_sec == 0 && ts.tv_nsec <= (long) (PA_HRTIMER_THRESHOLD_USEC*PA_NSEC_PER_USEC);
88 pa_assert_se(clock_getres(CLOCK_REALTIME, &ts) == 0);
89 return ts.tv_sec == 0 && ts.tv_nsec <= (long) (PA_HRTIMER_THRESHOLD_USEC*PA_NSEC_PER_USEC);
91 #else /* HAVE_CLOCK_GETTIME */
98 #define TIMER_SLACK_NS (int) ((500 * PA_NSEC_PER_USEC))
100 void pa_rtclock_hrtimer_enable(void) {
101 #ifdef PR_SET_TIMERSLACK
104 if ((slack_ns = prctl(PR_GET_TIMERSLACK, 0, 0, 0, 0)) < 0) {
105 pa_log_info("PR_GET_TIMERSLACK/PR_SET_TIMERSLACK not supported.");
109 pa_log_debug("Timer slack is set to %i us.", (int) (slack_ns/PA_NSEC_PER_USEC));
111 if (slack_ns > TIMER_SLACK_NS) {
112 slack_ns = TIMER_SLACK_NS;
114 pa_log_debug("Setting timer slack to %i us.", (int) (slack_ns/PA_NSEC_PER_USEC));
116 if (prctl(PR_SET_TIMERSLACK, slack_ns, 0, 0, 0) < 0) {
117 pa_log_warn("PR_SET_TIMERSLACK failed: %s", pa_cstrerror(errno));
125 struct timeval* pa_rtclock_from_wallclock(struct timeval *tv) {
127 #ifdef HAVE_CLOCK_GETTIME
128 struct timeval wc_now, rt_now;
130 pa_gettimeofday(&wc_now);
131 pa_rtclock_get(&rt_now);
135 if (pa_timeval_cmp(&wc_now, tv) < 0)
136 pa_timeval_add(&rt_now, pa_timeval_diff(tv, &wc_now));
138 pa_timeval_sub(&rt_now, pa_timeval_diff(&wc_now, tv));
146 pa_usec_t pa_timespec_load(const struct timespec *ts) {
150 (pa_usec_t) ts->tv_sec * PA_USEC_PER_SEC +
151 (pa_usec_t) ts->tv_nsec / PA_NSEC_PER_USEC;
155 static struct timeval* wallclock_from_rtclock(struct timeval *tv) {
157 #ifdef HAVE_CLOCK_GETTIME
158 struct timeval wc_now, rt_now;
160 pa_gettimeofday(&wc_now);
161 pa_rtclock_get(&rt_now);
165 if (pa_timeval_cmp(&rt_now, tv) < 0)
166 pa_timeval_add(&wc_now, pa_timeval_diff(tv, &rt_now));
168 pa_timeval_sub(&wc_now, pa_timeval_diff(&rt_now, tv));
176 struct timeval* pa_timeval_rtstore(struct timeval *tv, pa_usec_t v, pa_bool_t rtclock) {
179 if (v == PA_USEC_INVALID)
182 pa_timeval_store(tv, v);
185 tv->tv_usec |= PA_TIMEVAL_RTCLOCK;
187 wallclock_from_rtclock(tv);