X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp

diff --git a/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp b/SecurityTests/cspxutils/cputimeCal/cputimeCal.cpp
new file mode 100644
index 00000000..d35d3bd9
--- /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;
+}