From owner-freebsd-bugs  Fri Aug  6 22:20:32 1999
Delivered-To: freebsd-bugs@freebsd.org
Received: from freefall.freebsd.org (freefall.FreeBSD.ORG [204.216.27.21])
	by hub.freebsd.org (Postfix) with ESMTP id A481A14E9F
	for <freebsd-bugs@FreeBSD.org>; Fri,  6 Aug 1999 22:20:30 -0700 (PDT)
	(envelope-from gnats@FreeBSD.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.9.3/8.9.2) id WAA58666;
	Fri, 6 Aug 1999 22:20:02 -0700 (PDT)
	(envelope-from gnats@FreeBSD.org)
Received: from moose.tgsoft.com (cx20270-a.pwy1.sdca.home.com [24.0.169.3])
	by hub.freebsd.org (Postfix) with SMTP id 3029814CE5
	for <FreeBSD-gnats-submit@freebsd.org>; Fri,  6 Aug 1999 22:11:51 -0700 (PDT)
	(envelope-from mark@tgsoft.com)
Received: (qmail 91864 invoked by uid 128); 7 Aug 1999 05:10:42 -0000
Message-Id: <19990807051041.91863.qmail@moose.tgsoft.com>
Date: 7 Aug 1999 05:10:41 -0000
From: mark@tgsoft.com
Reply-To: mark@tgsoft.com
To: FreeBSD-gnats-submit@freebsd.org
X-Send-Pr-Version: 3.2
Subject: bin/13008: kill fails in libc_r
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


>Number:         13008
>Category:       bin
>Synopsis:       pthread_kill does not always work
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug  6 22:20:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     mark thompson
>Release:        FreeBSD 3.2-STABLE i386
>Organization:
tgsoft
>Environment:

3.2 stable pthread library

>Description:

I wrote an application that worked basically like this:

main:
   create a socket
   create 10 threads
   run for a while, then:

       send each thread a signal with pthread_kill and wait for it in
	   pthread_join.
       when one thread has been waited for, go back and kill the next one
   exit

Each thread (in a loop):
	does an accept on the socket
	copies some data
	closes the data socket
	repeats

The problem:

   Waiting in pthread_join was not fruitful. Examination shows that
   *most* of the threads that are in 'accept' were waiting for 
   the a lock on the socket (state: PS_FDLR_WAIT) and pthread_kill 
   does not do anything to them. One lucky thread would be in PS_FDR_WAIT, 
   and it could be killed... but it is hard for my application to know
   which thread that is.

>How-To-Repeat:

   Sorry, no sample code. I have hacked up the application to the
   point that it is no longer recognizeable.

>Fix:
	
   pthread_kill probably needs to know how to kill processes that
   are waiting for file locks.



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


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message