--wip-- [skip ci]

Author: GuillaumeLagrange

dist/core.c

@@ -11,7 +11,19 @@
 #include "core.h"
 
 #if defined(__APPLE__)
-#include <time.h>
+#include <mach/mach_time.h>
+
+static uint64_t get_timebase_numer(void) {
+  mach_timebase_info_data_t info;
+  mach_timebase_info(&info);
+  return info.numer;
+}
+
+static uint64_t get_timebase_denom(void) {
+  mach_timebase_info_data_t info;
+  mach_timebase_info(&info);
+  return info.denom;
+}
 #endif
 
 struct InstrumentHooks {
@@ -72,9 +84,7 @@ void instrument_hooks_set_feature(uint64_t feature, bool enabled) {
 
 uint64_t instrument_hooks_current_timestamp(void) {
 #if defined(__APPLE__)
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (uint64_t)ts.tv_sec * 1000000000ULL + (uint64_t)ts.tv_nsec;
+  return mach_absolute_time() * get_timebase_numer() / get_timebase_denom();
 #else
   return 0;
 #endif

scripts/stub.c

@@ -4,7 +4,19 @@
 #include "core.h"
 
 #if defined(__APPLE__)
-#include <time.h>
+#include <mach/mach_time.h>
+
+static uint64_t get_timebase_numer(void) {
+  mach_timebase_info_data_t info;
+  mach_timebase_info(&info);
+  return info.numer;
+}
+
+static uint64_t get_timebase_denom(void) {
+  mach_timebase_info_data_t info;
+  mach_timebase_info(&info);
+  return info.denom;
+}
 #endif
 
 struct InstrumentHooks {
@@ -65,9 +77,7 @@ void instrument_hooks_set_feature(uint64_t feature, bool enabled) {
 
 uint64_t instrument_hooks_current_timestamp(void) {
 #if defined(__APPLE__)
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (uint64_t)ts.tv_sec * 1000000000ULL + (uint64_t)ts.tv_nsec;
+  return mach_absolute_time() * get_timebase_numer() / get_timebase_denom();
 #else
   return 0;
 #endif