From: Ben Gras <ben@minix3.org>
Date: Fri, 27 Sep 2013 14:29:08 +0000 (+0000)
Subject: test75: force child to use a minimum of cpu time
X-Git-Tag: v3.3.0~764
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/syslog.conf.5.html?a=commitdiff_plain;h=b2dcc910d4fd2a2acce66c128c59d345392f6b2a;p=minix.git

test75: force child to use a minimum of cpu time

test75 sometimes false-fails if something else is going on
at the same time, presumably because the child doesn't spin
enough to register a nonzero getrusage() cpu time value, as
spin() uses the real time to limit the spinning.

this change forces spin() to do a minimum amount of spinning
before exiting, regardless of scheduling.

Change-Id: I57c63d22969bba418f36bcc8c5ace2b6fb445968
---

diff --git a/test/test75.c b/test/test75.c
index 288d2a98d..88c4c6d72 100644
--- a/test/test75.c
+++ b/test/test75.c
@@ -28,20 +28,20 @@ static void spin()
 {
 	struct timeval start_time;
 	struct timeval end_time;
-	int loop = 0;
+	unsigned int loop = 0;
 	if (gettimeofday(&start_time, NULL) == -1) {
 		e(1);
 		exit(1);
 	}
 	memset(&end_time, 0, sizeof(end_time));
-	while (start_time.tv_sec + 10 > end_time.tv_sec) {
-		if ((++loop % 10000) == 0) {
+	do {
+		if ((++loop % 3000000000) == 0) {
 			if (gettimeofday(&end_time, NULL) == -1) {
 				e(1);
 				exit(1);
 			}
 		}
-	}
+	} while (start_time.tv_sec + 10 > end_time.tv_sec);
 }
 
 int