Date: Wed, 20 Sep 2006 14:55:12 GMT From: Mike Tisdell <mike@netronix.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/103430: sleep() in a pthread returns prematurely when a signal is recv. Message-ID: <200609201455.k8KEtCRl017847@www.freebsd.org> Resent-Message-ID: <200609201500.k8KF0jIa049696@freefall.freebsd.org>
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>Number: 103430
>Category: misc
>Synopsis: sleep() in a pthread returns prematurely when a signal is recv.
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Sep 20 15:00:45 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Mike Tisdell
>Release: 5.5.x
>Organization:
Netronix
>Environment:
FreeBSD shuttle.netronix.com 5.5-PRERELEASE FreeBSD 5.5-PRERELEASE #5: Wed May 17 05:19:04 PDT 2006 root@shuttle.netronix.com:/usr/src/sys/i386/compile/SHUTTLE i386
FreeBSD ns4.keypointcu.com 5.5-STABLE FreeBSD 5.5-STABLE #5: Mon Aug 21 15:04:27 PDT 2006 mike@ns4.keypointcu.com:/usr/src/sys/i386/compile/NS4 i386
>Description:
sleep() in a pthreaded function will return immediately if the program receives a signal.
>How-To-Repeat:
Run the following program and then SIGHUP the process. Each SIGHUP will produce the output of both sighup() and pthread1(), but not main() i.e. the sleep timer in the main thread is working properly.
/*********************************************************************************************************
*** pthread.c ***
*** Pthread sleep bug demonstration ***
**********************************************************************************************************/
#include<stdio.h>
#include<pthread.h>
#include<stdlib.h>
void *pthread1()
{
while(1)
{
printf("pthread1\n");
sleep(3600);
}
}
void sighup()
{
printf("Received SIGHUP\n");
}
void quit()
{
printf("Received signal, quiting!\n");
exit(0);
}
int main()
{
int rc;
pthread_t thread1;
pthread_attr_t thread1_attr;
signal(SIGHUP, &sighup);
signal(SIGQUIT, &quit);
signal(SIGKILL, &quit);
signal(SIGTERM, &quit);
pthread_attr_init(&thread1_attr);
rc = pthread_create(&thread1, NULL, pthread1, NULL);
while(1)
{
printf("main\n");
sleep(3600);
}
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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