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>
37 #include <CoreServices/CoreServices.h>
38 #include <mach/mach.h>
39 #include <mach/mach_time.h>
47 #include <pulse/timeval.h>
48 #include <pulsecore/macro.h>
49 #include <pulsecore/core-error.h>
51 #include "core-rtclock.h"
54 static int64_t counter_freq
= 0;
57 pa_usec_t
pa_rtclock_age(const struct timeval
*tv
) {
61 return pa_timeval_diff(pa_rtclock_get(&now
), tv
);
64 struct timeval
*pa_rtclock_get(struct timeval
*tv
) {
66 #if defined(OS_IS_DARWIN)
67 uint64_t val
, abs_time
= mach_absolute_time();
70 nanos
= AbsoluteToNanoseconds(*(AbsoluteTime
*) &abs_time
);
71 val
= *(uint64_t *) &nanos
;
73 tv
->tv_sec
= val
/ PA_NSEC_PER_SEC
;
74 tv
->tv_usec
= (val
% PA_NSEC_PER_SEC
) / PA_NSEC_PER_USEC
;
78 #elif defined(HAVE_CLOCK_GETTIME)
81 #ifdef CLOCK_MONOTONIC
82 /* No locking or atomic ops for no_monotonic here */
83 static pa_bool_t no_monotonic
= FALSE
;
86 if (clock_gettime(CLOCK_MONOTONIC
, &ts
) < 0)
90 #endif /* CLOCK_MONOTONIC */
91 pa_assert_se(clock_gettime(CLOCK_REALTIME
, &ts
) == 0);
95 tv
->tv_sec
= ts
.tv_sec
;
96 tv
->tv_usec
= ts
.tv_nsec
/ PA_NSEC_PER_USEC
;
99 #elif defined(OS_IS_WIN32)
100 if (counter_freq
> 0) {
103 pa_assert_se(QueryPerformanceCounter(&count
));
105 tv
->tv_sec
= count
.QuadPart
/ counter_freq
;
106 tv
->tv_usec
= (count
.QuadPart
% counter_freq
) * PA_USEC_PER_SEC
/ counter_freq
;
110 #endif /* HAVE_CLOCK_GETTIME */
112 return pa_gettimeofday(tv
);
115 pa_bool_t
pa_rtclock_hrtimer(void) {
117 #if defined (OS_IS_DARWIN)
118 mach_timebase_info_data_t tbi
;
121 mach_timebase_info(&tbi
);
123 /* nsec = nticks * (N/D) - we want 1 tick == resolution !? */
124 time_nsec
= tbi
.numer
/ tbi
.denom
;
125 return time_nsec
<= (long) (PA_HRTIMER_THRESHOLD_USEC
*PA_NSEC_PER_USEC
);
127 #elif defined(HAVE_CLOCK_GETTIME)
130 #ifdef CLOCK_MONOTONIC
132 if (clock_getres(CLOCK_MONOTONIC
, &ts
) >= 0)
133 return ts
.tv_sec
== 0 && ts
.tv_nsec
<= (long) (PA_HRTIMER_THRESHOLD_USEC
*PA_NSEC_PER_USEC
);
135 #endif /* CLOCK_MONOTONIC */
137 pa_assert_se(clock_getres(CLOCK_REALTIME
, &ts
) == 0);
138 return ts
.tv_sec
== 0 && ts
.tv_nsec
<= (long) (PA_HRTIMER_THRESHOLD_USEC
*PA_NSEC_PER_USEC
);
140 #elif defined(OS_IS_WIN32)
142 if (counter_freq
> 0)
143 return counter_freq
>= (int64_t) (PA_USEC_PER_SEC
/PA_HRTIMER_THRESHOLD_USEC
);
145 #endif /* HAVE_CLOCK_GETTIME */
150 #define TIMER_SLACK_NS (int) ((500 * PA_NSEC_PER_USEC))
152 void pa_rtclock_hrtimer_enable(void) {
154 #ifdef PR_SET_TIMERSLACK
157 if ((slack_ns
= prctl(PR_GET_TIMERSLACK
, 0, 0, 0, 0)) < 0) {
158 pa_log_info("PR_GET_TIMERSLACK/PR_SET_TIMERSLACK not supported.");
162 pa_log_debug("Timer slack is set to %i us.", (int) (slack_ns
/PA_NSEC_PER_USEC
));
164 if (slack_ns
> TIMER_SLACK_NS
) {
165 slack_ns
= TIMER_SLACK_NS
;
167 pa_log_debug("Setting timer slack to %i us.", (int) (slack_ns
/PA_NSEC_PER_USEC
));
169 if (prctl(PR_SET_TIMERSLACK
, slack_ns
, 0, 0, 0) < 0) {
170 pa_log_warn("PR_SET_TIMERSLACK failed: %s", pa_cstrerror(errno
));
175 #elif defined(OS_IS_WIN32)
178 pa_assert_se(QueryPerformanceFrequency(&freq
));
179 counter_freq
= freq
.QuadPart
;
184 struct timeval
* pa_rtclock_from_wallclock(struct timeval
*tv
) {
185 struct timeval wc_now
, rt_now
;
189 pa_gettimeofday(&wc_now
);
190 pa_rtclock_get(&rt_now
);
192 /* pa_timeval_sub() saturates on underflow! */
194 if (pa_timeval_cmp(&wc_now
, tv
) < 0)
195 pa_timeval_add(&rt_now
, pa_timeval_diff(tv
, &wc_now
));
197 pa_timeval_sub(&rt_now
, pa_timeval_diff(&wc_now
, tv
));
204 #ifdef HAVE_CLOCK_GETTIME
205 pa_usec_t
pa_timespec_load(const struct timespec
*ts
) {
207 if (PA_UNLIKELY(!ts
))
208 return PA_USEC_INVALID
;
211 (pa_usec_t
) ts
->tv_sec
* PA_USEC_PER_SEC
+
212 (pa_usec_t
) ts
->tv_nsec
/ PA_NSEC_PER_USEC
;
215 struct timespec
* pa_timespec_store(struct timespec
*ts
, pa_usec_t v
) {
218 if (PA_UNLIKELY(v
== PA_USEC_INVALID
)) {
219 ts
->tv_sec
= PA_INT_TYPE_MAX(time_t);
220 ts
->tv_nsec
= (long) (PA_NSEC_PER_SEC
-1);
224 ts
->tv_sec
= (time_t) (v
/ PA_USEC_PER_SEC
);
225 ts
->tv_nsec
= (long) ((v
% PA_USEC_PER_SEC
) * PA_NSEC_PER_USEC
);
231 static struct timeval
* wallclock_from_rtclock(struct timeval
*tv
) {
232 struct timeval wc_now
, rt_now
;
236 pa_gettimeofday(&wc_now
);
237 pa_rtclock_get(&rt_now
);
239 /* pa_timeval_sub() saturates on underflow! */
241 if (pa_timeval_cmp(&rt_now
, tv
) < 0)
242 pa_timeval_add(&wc_now
, pa_timeval_diff(tv
, &rt_now
));
244 pa_timeval_sub(&wc_now
, pa_timeval_diff(&rt_now
, tv
));
251 struct timeval
* pa_timeval_rtstore(struct timeval
*tv
, pa_usec_t v
, pa_bool_t rtclock
) {
254 if (v
== PA_USEC_INVALID
)
257 pa_timeval_store(tv
, v
);
260 tv
->tv_usec
|= PA_TIMEVAL_RTCLOCK
;
262 wallclock_from_rtclock(tv
);