timer.c

@@ -1,6 +1,37 @@
-#include <time.h>
 #include "timer.h"
 
+#if __APPLE__
+#include <sys/time.h>
+static struct timespec start = {0, 0};
+
+// Starts the timer.
+void startTimer()
+{
+    clock_gettime(CLOCK_MONOTONIC, &start);
+}
+
+// Returns the time in seconds since startTimer() was called.
+double stopTimer()
+{
+    struct timespec end;
+    
+    clock_gettime(CLOCK_MONOTONIC, &end);
+
+    unsigned long long delta_us = (end.tv_sec - start.tv_sec) * 1000000 + (end.tv_nsec - start.tv_nsec) / 1000;
+
+    double measuredSeconds = (double)delta_us / 1000000.;
+
+    if(start.tv_nsec > 0) {
+        start.tv_nsec = 0;
+        start.tv_sec = 0;
+    }
+    else
+        measuredSeconds = -1;
+
+    return measuredSeconds;
+}
+#else
+#include <time.h>
 static clock_t startClocks = 0;
 
 // Starts the timer.
@@ -21,3 +52,4 @@ double stopTimer()
 
     return measuredSeconds;
 }
+#endif