code.delx.au - pulseaudio/blob - src/pulsecore/rtclock.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as
  11   published by the Free Software Foundation; either version 2.1 of the
  12   License, or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public
  20   License along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <stddef.h>
  30 #include <time.h>
  31 #include <sys/time.h>
  32
  33 #include <pulse/timeval.h>
  34 #include <pulsecore/macro.h>
  35
  36 #include "rtclock.h"
  37
  38 pa_usec_t pa_rtclock_age(const struct timeval *tv) {
  39     struct timeval now;
  40     pa_assert(tv);
  41
  42     return pa_timeval_diff(pa_rtclock_get(&now), tv);
  43 }
  44
  45 struct timeval *pa_rtclock_get(struct timeval *tv) {
  46 #ifdef HAVE_CLOCK_GETTIME
  47     struct timespec ts;
  48
  49 #ifdef CLOCK_MONOTONIC
  50     /* No locking or atomic ops for no_monotonic here */
  51     static pa_bool_t no_monotonic = FALSE;
  52
  53     if (!no_monotonic)
  54         if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
  55             no_monotonic = TRUE;
  56
  57     if (no_monotonic)
  58 #endif
  59         pa_assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
  60
  61     pa_assert(tv);
  62
  63     tv->tv_sec = ts.tv_sec;
  64     tv->tv_usec = ts.tv_nsec / 1000;
  65
  66     return tv;
  67
  68 #else /* HAVE_CLOCK_GETTIME */
  69
  70     return pa_gettimeofday(tv);
  71
  72 #endif
  73 }
  74
  75 pa_bool_t pa_rtclock_hrtimer(void) {
  76 #ifdef HAVE_CLOCK_GETTIME
  77     struct timespec ts;
  78
  79 #ifdef CLOCK_MONOTONIC
  80     if (clock_getres(CLOCK_MONOTONIC, &ts) >= 0)
  81         return ts.tv_sec == 0 && ts.tv_nsec <= PA_HRTIMER_THRESHOLD_USEC*1000;
  82 #endif
  83
  84     pa_assert_se(clock_getres(CLOCK_REALTIME, &ts) == 0);
  85     return ts.tv_sec == 0 && ts.tv_nsec <= PA_HRTIMER_THRESHOLD_USEC*1000;
  86
  87 #else /* HAVE_CLOCK_GETTIME */
  88
  89     return FALSE;
  90
  91 #endif
  92 }
  93
  94 pa_usec_t pa_rtclock_usec(void) {
  95     struct timeval tv;
  96
  97     return pa_timeval_load(pa_rtclock_get(&tv));
  98 }