timer: use monotonic clock if available

1 files changed, 95 insertions, 0 deletions

diff --git a/src/clock.c b/src/clock.c
new file mode 100644
index 00000000..4100fa2d
--- /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
+}
+