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Date: Thu, 25 Oct 2001 23:49:55 -0700 (PDT)
From: Vladimir Birjukov <prg51@morics.riga.post.lv>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: i386/31504: nanosleep() strange behavior
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>Number:         31504
>Category:       i386
>Synopsis:       nanosleep() strange behavior
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 25 23:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir Birjukov
>Release:        4.4-STABLE
>Organization:
at Home
>Environment:
FreeBSD aizk02.aizk.post.lv 4.4-STABLE FreeBSD 4.4-STABLE #14: Tue Oct 23 12:59:46 EEST 2001     wl@aizk02.aizk.post.lv:/usr/src/sys/compile/PRG51  i386


>Description:
In picprog program (ports/devel/picprog), which work nice in FreeBSD 4.3-RELEASE
after become STABLE lost functioning. Because such fragment
  ioctl (fd, TIOCMBIS, &picport::rts_bit); // clock up
  delay_100 ();
  ioctl (fd, TIOCMBIC, &picport::rts_bit); // clock down
where delay_100 is:
  static const struct timespec ns100 = { 0, 100 };                              
  nanosleep (&ns100, 0);                                                        
Makes 10 milliseconds pulse instead 0.1 mikrosecond

And I Think some strange behavior in console application may have the same source,
as this described.


>How-To-Repeat:
This code should not work one second.

#include <time.h>
int main() {
	int i;
	static const struct timespec ns100 = { 0, 100 };
	for (i=0; i<100; i++)
		nanosleep (&ns100, 0);
	return 0;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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