diff --git a/Makefile.am b/Makefile.am
index 332b51d9e..0077eaf59 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -227,6 +227,7 @@ src_mpd_SOURCES = \
$(OUTPUT_API_SRC) \
$(MIXER_API_SRC) \
src/glib_socket.h \
+ src/clock.c src/clock.h \
src/notify.c \
src/audio_config.c src/audio_config.h \
src/audio_check.c \
@@ -1069,7 +1070,7 @@ test_dump_playlist_SOURCES = test/dump_playlist.c \
src/audio_check.c src/pcm_buffer.c \
src/text_input_stream.c src/fifo_buffer.c \
src/cue/cue_parser.c src/cue/cue_parser.h \
- src/timer.c \
+ src/timer.c src/clock.c \
src/fd_util.c
if HAVE_FLAC
@@ -1096,7 +1097,7 @@ test_run_decoder_SOURCES = test/run_decoder.c \
src/fd_util.c \
src/audio_check.c \
src/audio_format.c \
- src/timer.c \
+ src/timer.c src/clock.c \
$(ARCHIVE_SRC) \
$(INPUT_SRC) \
$(TAG_SRC) \
@@ -1118,7 +1119,7 @@ test_read_tags_SOURCES = test/read_tags.c \
src/uri.c \
src/fd_util.c \
src/audio_check.c \
- src/timer.c \
+ src/timer.c src/clock.c \
$(DECODER_SRC)
if HAVE_ID3TAG
@@ -1240,7 +1241,7 @@ test_run_output_SOURCES = test/run_output.c \
src/audio_check.c \
src/audio_format.c \
src/audio_parser.c \
- src/timer.c \
+ src/timer.c src/clock.c \
src/tag.c src/tag_pool.c \
src/fifo_buffer.c src/growing_fifo.c \
src/page.c \
diff --git a/NEWS b/NEWS
index 812d03908..9b72f6ba0 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,8 @@
ver 0.17.2 (2012/??/??)
* protocol:
- fix crash in local file check
+* output:
+ - httpd: use monotonic clock, avoid hiccups after system clock adjustment
* mapper: fix non-UTF8 music directory name
diff --git a/src/clock.c b/src/clock.c
new file mode 100644
index 000000000..4100fa2d8
--- /dev/null
+++ b/src/clock.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "clock.h"
+
+#ifdef WIN32
+#include <windows.h>
+#elif defined(__APPLE__)
+#include <mach/mach_time.h>
+#else
+#include <time.h>
+#endif
+
+unsigned
+monotonic_clock_ms(void)
+{
+#ifdef WIN32
+ return GetTickCount();
+#elif defined(__APPLE__) /* OS X does not define CLOCK_MONOTONIC */
+ static mach_timebase_info_data_t base;
+ if (base.denom == 0)
+ (void)mach_timebase_info(&base);
+
+ return (unsigned)((mach_absolute_time() * base.numer)
+ / (1000000 * base.denom));
+#elif defined(CLOCK_MONOTONIC)
+ struct timespec ts;
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+#else
+ /* we have no monotonic clock, fall back to gettimeofday() */
+ struct timeval tv;
+ gettimeofday(&tv, 0);
+ return tv.tv_sec * 1000 + tv.tv_usec / 1000;
+#endif
+}
+
+uint64_t
+monotonic_clock_us(void)
+{
+#ifdef WIN32
+ LARGE_INTEGER l_value, l_frequency;
+
+ if (!QueryPerformanceCounter(&l_value) ||
+ !QueryPerformanceFrequency(&l_frequency))
+ return 0;
+
+ uint64_t value = l_value.QuadPart;
+ uint64_t frequency = l_frequency.QuadPart;
+
+ if (frequency > 1000000) {
+ value *= 10000;
+ value /= frequency / 100;
+ } else if (frequency < 1000000) {
+ value *= 10000;
+ value /= frequency;
+ value *= 100;
+ }
+
+ return value;
+#elif defined(__APPLE__) /* OS X does not define CLOCK_MONOTONIC */
+ static mach_timebase_info_data_t base;
+ if (base.denom == 0)
+ (void)mach_timebase_info(&base);
+
+ return ((uint64_t)mach_absolute_time() * (uint64_t)base.numer)
+ / (1000 * (uint64_t)base.denom);
+#elif defined(CLOCK_MONOTONIC)
+ struct timespec ts;
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ return (uint64_t)ts.tv_sec * 1000000 + (uint64_t)(ts.tv_nsec / 1000);
+#else
+ /* we have no monotonic clock, fall back to gettimeofday() */
+ struct timeval tv;
+ gettimeofday(&tv, 0);
+ return (uint64_t)tv.tv_sec * 1000 + (uint64_t)(tv.tv_usec) / 1000(;
+#endif
+}
+
diff --git a/src/clock.h b/src/clock.h
new file mode 100644
index 000000000..4ece35ab1
--- /dev/null
+++ b/src/clock.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_CLOCK_H
+#define MPD_CLOCK_H
+
+#include <glib.h>
+
+#include <stdint.h>
+
+/**
+ * Returns the value of a monotonic clock in milliseconds.
+ */
+G_GNUC_PURE
+unsigned
+monotonic_clock_ms(void);
+
+/**
+ * Returns the value of a monotonic clock in microseconds.
+ */
+G_GNUC_PURE
+uint64_t
+monotonic_clock_us(void);
+
+#endif
diff --git a/src/timer.c b/src/timer.c
index 691ab76be..2d9550706 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -20,23 +20,14 @@
#include "config.h"
#include "timer.h"
#include "audio_format.h"
+#include "clock.h"
#include <glib.h>
#include <assert.h>
#include <limits.h>
-#include <sys/time.h>
#include <stddef.h>
-static uint64_t now(void)
-{
- struct timeval tv;
-
- gettimeofday(&tv, NULL);
-
- return ((uint64_t)tv.tv_sec * 1000000) + tv.tv_usec;
-}
-
struct timer *timer_new(const struct audio_format *af)
{
struct timer *timer = g_new(struct timer, 1);
@@ -54,7 +45,7 @@ void timer_free(struct timer *timer)
void timer_start(struct timer *timer)
{
- timer->time = now();
+ timer->time = monotonic_clock_us();
timer->started = 1;
}
@@ -74,7 +65,7 @@ void timer_add(struct timer *timer, int size)
unsigned
timer_delay(const struct timer *timer)
{
- int64_t delay = (int64_t)(timer->time - now()) / 1000;
+ int64_t delay = (int64_t)(timer->time - monotonic_clock_us()) / 1000;
if (delay < 0)
return 0;
@@ -90,7 +81,7 @@ void timer_sync(struct timer *timer)
assert(timer->started);
- sleep_duration = timer->time - now();
+ sleep_duration = timer->time - monotonic_clock_us();
if (sleep_duration > 0)
g_usleep(sleep_duration);
}