..

src/manifest.m

@@ -21,6 +21,7 @@
 #include <semaphore.h>
 #include <pthread.h>
 
+#include "misc/timing.h"
 #include "misc/macros.h"
 #include "misc/notify.h"
 #include "misc/log.h"

src/misc/timing.h

@@ -0,0 +1,29 @@
+#include <CoreServices/CoreServices.h>
+#include <mach/mach_time.h>
+
+static inline uint64_t time_clock(void)
+{
+    return mach_absolute_time();
+}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+static inline uint64_t time_elapsed_ns(uint64_t begin, uint64_t end)
+{
+    uint64_t elapsed = end - begin;
+    Nanoseconds nano = AbsoluteToNanoseconds(*(AbsoluteTime *) &elapsed);
+    return *(uint64_t *) &nano;
+}
+#pragma clang diagnostic pop
+
+static inline double time_elapsed_ms(uint64_t begin, uint64_t end)
+{
+    uint64_t ns = time_elapsed_ns(begin, end);
+    return (double)(ns / 1000000.0);
+}
+
+static inline double time_elapsed_s(uint64_t begin, uint64_t end)
+{
+    uint64_t ns = time_elapsed_ns(begin, end);
+    return (double)(ns / 1000000000.0);
+}