Security-57031.1.35.tar.gz

[apple/security.git] / SecurityTests / cspxutils / cputimeCal / cputimeCal.cpp

diff --git a/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp b/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp
new file mode 100644 (file)
index 0000000..d35d3bd
--- /dev/null
+++ b/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp
@@ -0,0 +1,36 @@
+/* compare CPUTimeRead() vs CFAbsoluteTimeGetCurrent() */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "cputime.h"
+#include <CoreFoundation/CoreFoundation.h>
+
+#define WAIT_TIME_SEC  1.0
+
+int main()
+{
+       CPUTime cputimeStart, cputimeEnd;
+       CFAbsoluteTime start;
+
+       printf("Resolution on this machine: %f nanoseconds\n",
+               CPUTimeDeltaUs(0ULL, 1ULL) * 1000.0);
+
+       start = CFAbsoluteTimeGetCurrent();
+       cputimeStart = CPUTimeRead();
+       while((CFAbsoluteTimeGetCurrent() - start) < WAIT_TIME_SEC) {
+               ;
+       }
+       cputimeEnd = CPUTimeRead();
+       
+       printf("Waited %f sec; elapsed CPUTime %f s\n",
+               WAIT_TIME_SEC, CPUTimeDeltaSec(cputimeStart, cputimeEnd));
+       printf("cputimeStart %08X:%08X   cputimeEnd %08X:%08X\n",
+               (unsigned)(cputimeStart >> 32),
+               (unsigned)(cputimeStart & 0xffffffffULL),
+               (unsigned)(cputimeEnd >> 32),
+               (unsigned)(cputimeEnd & 0xffffffffULL));
+       printf("cputime raw delta %lu\n", 
+               (unsigned long)(cputimeEnd - cputimeStart));
+
+       return 0;
+}