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Message-Id: <199906020057.RAA22111@iss-p1.lbl.gov>
Date: Tue, 1 Jun 1999 17:57:18 -0700 (PDT)
From: Jin Guojun (FTG staff) <jin@iss-p1.lbl.gov>
Reply-To: jin@iss-p1.lbl.gov
To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/11984: pthread_kill cannot kill select() threads, etc.
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         11984
>Category:       kern
>Synopsis:       pthread_kill cannot kill select() threads, etc.
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun  1 18:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Jin Guojun (FTG staff)
>Release:        FreeBSD 3.2-RELEASE i386
>Organization:
>Environment:

	All released version with libc_r

>Description:

	(1)	missing pthread_setcanceltype() and pthread_cancel()
	(2)	pthread_kill does not function correctly on a select()
		thread. See the small program in How-To-Repeat .
	The u_thread_* need to be replaced by simple thread/pthread calls.
	This version is for a universal thread programming.  You may get
	stdef.h and <uthread.h> from CCS library at
		ftp://george.lbl.gov/pub/ccs/ccs-2.1.tgz

	When you run the a.out, you will see all print-out.
	under Solaris/Linux, you will see the program terminated, but under
	FreeBSD, you will see a.out hanging. Use ktrace, you will see it
	hangs on select; however, we saw the "stest finished" which means
	the select() has been killed, but where is the other one from?

>How-To-Repeat:

	
/*	cc -DUSE_PTHREAD pselect.c -l[c_r/pthread/etc.]
*/

#ifdef	CCS_ECL2
#include <stdef.h>
#include <uthread.h>
#else
#include <pthread.h>
#endif

#include <sys/types.h>
#include <fcntl.h>
#ifdef	linux
#include <signal.h>
#endif

test(void * np)
{
int	fd = (int) np;
fd_set	rfds;
	FD_ZERO(&rfds);
	FD_SET(fd, &rfds);
	printf("stest started\n");
	select(2, &rfds, NULL, NULL,	NULL);
	printf("stest finished\n");
u_thread_exit(0);
}

main()
{
char	*fn="/tmp/stest", *fmt="can't open file %s\n";
u_thread_t	tid;
int	fd = open(fn, O_RDONLY | O_CREAT, 0660);
	if (fd < 0)	{
#ifdef	_FreeBSD_
		errx(fd, fmt, fn);
#else
		printf(fmt, fn);
		exit(fd);
#endif
	}

	u_thread_create(&tid, 0, test, fd);
	sleep(2);
	printf("main kill %d\n", tid);
	u_thread_kill(tid, /* SIGKILL | SIGINT */ SIGTERM);
	printf("main quit\n");
u_thread_exit(0);
}


>Fix:
	
	Not known yet.

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


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