lib: Implement monotonically increasing clock for Darwin.
There is no Posix CLOCK_MONOTONIC in Darwin, but monotonically
increasing clock can be implemented using mach_absolute_time().
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/thread.c b/lib/thread.c
index 6341dfd..16c92c2 100644
--- a/lib/thread.c
+++ b/lib/thread.c
@@ -39,6 +39,11 @@
extern int agentx_enabled;
#endif
+#if defined(__APPLE__)
+#include <mach/mach.h>
+#include <mach/mach_time.h>
+#endif
+
/* Recent absolute time of day */
struct timeval recent_time;
@@ -103,7 +108,7 @@
+ (a.tv_usec - b.tv_usec));
}
-#ifndef HAVE_CLOCK_MONOTONIC
+#if !defined(HAVE_CLOCK_MONOTONIC) && !defined(__APPLE__)
static void
quagga_gettimeofday_relative_adjust (void)
{
@@ -122,7 +127,7 @@
}
last_recent_time = recent_time;
}
-#endif /* !HAVE_CLOCK_MONOTONIC */
+#endif /* !HAVE_CLOCK_MONOTONIC && !__APPLE__ */
/* gettimeofday wrapper, to keep recent_time updated */
static int
@@ -162,7 +167,23 @@
relative_time.tv_usec = tp.tv_nsec / 1000;
}
}
-#else /* !HAVE_CLOCK_MONOTONIC */
+#elif defined(__APPLE__)
+ {
+ uint64_t ticks;
+ uint64_t useconds;
+ static mach_timebase_info_data_t timebase_info;
+
+ ticks = mach_absolute_time();
+ if (timebase_info.denom == 0)
+ mach_timebase_info(&timebase_info);
+
+ useconds = ticks * timebase_info.numer / timebase_info.denom / 1000;
+ relative_time.tv_sec = useconds / 1000000;
+ relative_time.tv_usec = useconds % 1000000;
+
+ return 0;
+ }
+#else /* !HAVE_CLOCK_MONOTONIC && !__APPLE__ */
if (!(ret = quagga_gettimeofday (&recent_time)))
quagga_gettimeofday_relative_adjust();
#endif /* HAVE_CLOCK_MONOTONIC */