[LTP] [PATCH] open_posix/conformance/clock/1.1: Deterministic timing

[Joerg Vehlow <lkml@jv-coder.de>]

From: Joerg Vehlow <joerg.vehlow@aox-tech.de>

On some systems the loop with 8 million iterations takes a very long time.
This patches changes it to busy loop for five seconds.

Signed-off-by: Joerg Vehlow <joerg.vehlow@aox-tech.de>
---
 .../conformance/interfaces/clock/1-1.c                 | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/testcases/open_posix_testsuite/conformance/interfaces/clock/1-1.c b/testcases/open_posix_testsuite/conformance/interfaces/clock/1-1.c
index 9c48cd979..cce5beea9 100644
--- a/testcases/open_posix_testsuite/conformance/interfaces/clock/1-1.c
+++ b/testcases/open_posix_testsuite/conformance/interfaces/clock/1-1.c
@@ -17,20 +17,22 @@
 #include <time.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <time.h>
 #include "posixtest.h"
 
-#define LARGENUMBER 8000000
+#define BUSY_LOOP_SECONDS 5
 int main(void)
 {
 	clock_t c1, c2;
 	double sec1, sec2;
-	int i;
+	time_t end;
 
 	c1 = clock();
 	sec1 = c1 / CLOCKS_PER_SEC;
 
-	for (i = 0; i < LARGENUMBER; i++) {
-		// keep busy so CPU time increases
+	end = time(NULL) + BUSY_LOOP_SECONDS;
+
+	while (end >= time(NULL)) {
 		clock();
 	}
 
-- 
2.20.1