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test75: force child to use a minimum of cpu time

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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
This commit is contained in:
Ben Gras 2013-09-27 14:29:08 +00:00 committed by Gerrit Code Review
parent b50dbb4d24
commit b2dcc910d4
1 changed files with 4 additions and 4 deletions
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8
test/test75.c
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@ -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