add monotonic clock abstraction pa_rtclock

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1687 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/rtclock.h

@@ -0,0 +1,48 @@
+#ifndef foopulsertclockhfoo
+#define foopulsertclockhfoo
+
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  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.
+***/
+
+#include <sys/types.h>
+#include <time.h>
+
+#include <pulse/sample.h>
+
+/* Something like pulse/timeval.h but based on CLOCK_MONOTONIC and
+ * timespec instead of timeval */
+
+struct timespec *pa_rtclock_get(struct timespec *ts);
+pa_usec_t pa_rtclock_age(const struct timespec *tv);
+int pa_rtclock_hrtimer(void);
+
+struct timespec *pa_timespec_store(struct timespec *a, pa_usec_t u);
+pa_usec_t pa_timespec_load(struct timespec *tv);
+struct timespec *pa_timespec_add(struct timespec *tv, pa_usec_t t);
+pa_usec_t pa_timespec_diff(const struct timespec *a, const struct timespec *b);
+int pa_timespec_cmp(const struct timespec *a, const struct timespec *b);
+
+/* timer with a resolution better than this are considered high-resolution */
+#define PA_HRTIMER_THRESHOLD_USEC 10
+
+#endif