1 files changed, 117 insertions, 0 deletions
diff --git a/src/pulsecore/rtclock.c b/src/pulsecore/rtclock.c
new file mode 100644
index 00000000..f33de830
--- /dev/null
+++ b/src/pulsecore/rtclock.c
@@ -0,0 +1,117 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stddef.h>
+#include <time.h>
+#include <sys/time.h>
+
+#include <pulse/timeval.h>
+#include <pulsecore/macro.h>
+
+#include "rtclock.h"
+
+pa_usec_t pa_rtclock_age(const struct timeval *tv) {
+    struct timeval now;
+    pa_assert(tv);
+
+    return pa_timeval_diff(pa_rtclock_get(&now), tv);
+}
+
+struct timeval *pa_rtclock_get(struct timeval *tv) {
+#ifdef HAVE_CLOCK_GETTIME
+    struct timespec ts;
+
+#ifdef CLOCK_MONOTONIC
+    /* No locking or atomic ops for no_monotonic here */
+    static pa_bool_t no_monotonic = FALSE;
+
+    if (!no_monotonic)
+        if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
+            no_monotonic = TRUE;
+
+    if (no_monotonic)
+#endif
+        pa_assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
+
+    pa_assert(tv);
+
+    tv->tv_sec = ts.tv_sec;
+    tv->tv_usec = ts.tv_nsec / 1000;
+
+    return tv;
+
+#else /* HAVE_CLOCK_GETTIME */
+
+    return pa_gettimeofday(tv);
+
+#endif
+}
+
+pa_bool_t pa_rtclock_hrtimer(void) {
+#ifdef HAVE_CLOCK_GETTIME
+    struct timespec ts;
+
+#ifdef CLOCK_MONOTONIC
+    if (clock_getres(CLOCK_MONOTONIC, &ts) >= 0)
+        return ts.tv_sec == 0 && ts.tv_nsec <= PA_HRTIMER_THRESHOLD_USEC*1000;
+#endif
+
+    pa_assert_se(clock_getres(CLOCK_REALTIME, &ts) == 0);
+    return ts.tv_sec == 0 && ts.tv_nsec <= PA_HRTIMER_THRESHOLD_USEC*1000;
+
+#else /* HAVE_CLOCK_GETTIME */
+
+    return FALSE;
+
+#endif
+}
+
+pa_usec_t pa_rtclock_usec(void) {
+    struct timeval tv;
+
+    return pa_timeval_load(pa_rtclock_get(&tv));
+}
+
+struct timeval* pa_rtclock_from_wallclock(struct timeval *tv) {
+
+#ifdef HAVE_CLOCK_GETTIME
+    struct timeval wc_now, rt_now;
+
+    pa_gettimeofday(&wc_now);
+    pa_rtclock_get(&rt_now);
+
+    pa_assert(tv);
+
+    if (pa_timeval_cmp(&wc_now, tv) < 0)
+        pa_timeval_add(&rt_now, pa_timeval_diff(tv, &wc_now));
+    else
+        pa_timeval_sub(&rt_now, pa_timeval_diff(&wc_now, tv));
+
+    *tv = rt_now;
+#endif
+
+    return tv;
+}