Add util.c

diff --git a/util.c b/util.c
new file mode 100644 (file)
index 0000000..ff2b191
--- /dev/null
+++ b/util.c
@@ -0,0 +1,36 @@
+#include <time.h>
+
+#ifdef NMRPFLASH_OSX
+#include <mach/mach_time.h>
+#endif
+
+time_t time_monotonic()
+{
+#ifndef NMRPFLASH_WINDOWS
+#ifndef NMRPFLASH_OSX
+       struct timespec ts;
+       clock_gettime(CLOCK_MONOTONIC, &ts);
+       return ts.ts_sec;
+#else
+       static double factor = 0.0;
+       mach_timebase_info_data_t timebase;
+       if (factor == 0.0) {
+               mach_timebase_info(&timebase);
+               factor = (double)timebase.numer / timebase.denom;
+       }
+
+       return round(mach_absolute_time() * factor / 1e9);
+#endif
+#else
+       return round(GetTickCount() / 1000.0);
+#endif
+}
+
+int main()
+{
+       time_t beg = time_monotonic();
+       printf("now: %ld\n", beg);
+       sleep(2);
+       printf("+2s: %ld\n", time_monotonic());
+       return 0;
+}