Fix macOS time benchmark

#31 Fix macOS time benchmark

Author: longxinH

extension/php_xhprof.h

@@ -224,6 +224,8 @@ static inline void hp_array_del(char **name_array);
 char *hp_get_trace_callback(char *symbol, zend_execute_data *data);
 void hp_init_trace_callbacks();
 
+double get_timebase_conversion();
+
 hp_ignored_functions *hp_ignored_functions_init(char **names);
 
 /* Struct to hold the various callbacks for a single xhprof mode */
@@ -286,6 +288,8 @@ ZEND_BEGIN_MODULE_GLOBALS(xhprof)
     /* Table of ignored function names and their filter */
     hp_ignored_functions *ignored_functions;
 
+    double timebase_conversion;
+
 ZEND_END_MODULE_GLOBALS(xhprof)
 
 PHP_MINIT_FUNCTION(xhprof);

extension/xhprof.c

@@ -299,6 +299,8 @@ PHP_RINIT_FUNCTION(xhprof)
     ZEND_TSRMLS_CACHE_UPDATE();
 #endif
 
+    XHPROF_G(timebase_conversion) = get_timebase_conversion();
+
     return SUCCESS;
 }
 
@@ -401,6 +403,18 @@ void hp_ignored_functions_clear(hp_ignored_functions *functions)
     efree(functions);
 }
 
+double get_timebase_conversion()
+{
+#if defined(__APPLE__)
+    mach_timebase_info_data_t info;
+    (void) mach_timebase_info(&info);
+
+    return (info.numer / info.denom) * 1000 * 1000;
+#endif
+
+    return 1.0;
+}
+
 hp_ignored_functions *hp_ignored_functions_init(char **names)
 {
     /* Delete the array storing ignored function names */
@@ -838,7 +852,7 @@ void hp_sample_check(hp_entry_t **entries)
 static inline uint64 cycle_timer()
 {
 #if defined(__APPLE__) && defined(__MACH__)
-    return mach_absolute_time();
+    return mach_absolute_time() / XHPROF_G(timebase_conversion);
 #else
     struct timespec s;
     clock_gettime(CLOCK_MONOTONIC, &s);