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<H1>[MUD-Dev] Re: LinuxThreads and SIGUSR1 (Ref: [MUD-Dev])</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: LinuxThreads and SIGUSR1 (Ref: [MUD-Dev])</LI>
<LI><em>From</em>: "Adam J. Thornton" <<A HREF="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</A>></LI>
<LI><em>Date</em>: Wed, 12 Aug 1998 19:09:05 -0400</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
On Wed, Aug 12, 1998 at 03:18:53PM -0600, Lucas Thompson wrote:
> At 12:35 PM -0600 8/12/1998, Adam J. Thornton wrote:
> > An unrelated problem, but a very annoying one. I'm new to Linux threads
> > programming. I'm using RH5.1. When I call pthread_create() I get the new
> > thread, but also a SIGUSR1. If I don't SIG_IGN it, the program exits (this
> > is default behavior for SIGUSR1). But if I *do* ignore it, then the
> > process never returns from the thread creation. Did I miss something
> > really obvious here?
> Odd, I do SIG_IGN our USR1/USR2 signals, but back when I was first adding
> our threaded I/O and dns code I don't remember the process exiting when it
> got USR1 (back before we added signal handling to our mud). I may be wrong,
> it's been a year or so. Are you compiling with -D_REENTRANT? Linking with
> pthreads without defining _REENTRANT is a Bad Thing(tm) because your IO
> calls will lose their 'errno' and frequently exit falsely even when nothing
> went wrong.
Ah. A little more digging with a thread-enabled debugger helped.
SIGUSR1 and SIGUSR2 are indeed used by Linuxthreads, but what was actually
killing me was a SIGSEGV. And that...was because I was passing a NULL
pointer to pthread_create as its first argument. Why, you might ask, was I
doing that? Well, because that's what Stevens did. But it's wrong.
Allocate some space for the pthread_t pointer and pass it, and it works
fine.
I'll send him a bug report.
Adam
--
adam#princeton,edu
"There's a border to somewhere waiting, and a tank full of time." - J. Steinman
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<UL><LI><STRONG>References</STRONG>:
<UL>
<LI><STRONG><A NAME="00690" HREF="msg00690.html">[MUD-Dev] Re: clients anyone?...</A></STRONG>
<UL><LI><EM>From:</EM> Hans-Henrik Staerfeldt <hhs#cbs,dtu.dk></LI></UL></LI>
<LI><STRONG><A NAME="00663" HREF="msg00663.html">[MUD-Dev] Re: clients anyone?...</A></STRONG>
<UL><LI><EM>From:</EM> "Adam J. Thornton" <adam#phoenix,Princeton.EDU></LI></UL></LI>
<LI><STRONG><A NAME="00692" HREF="msg00692.html">[MUD-Dev] Re: clients anyone?...</A></STRONG>
<UL><LI><EM>From:</EM> "Adam J. Thornton" <adam#phoenix,Princeton.EDU></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: clients anyone?...</STRONG>, <EM>(continued)</EM>
<ul compact>
<ul compact>
<LI><strong><A NAME="00665" HREF="msg00665.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Andrew Wilson <a href="mailto:andrew#aaaaaaaa,demon.co.uk">andrew#aaaaaaaa,demon.co.uk</a>, Tue 11 Aug 1998, 21:56 GMT
</LI>
<LI><strong><A NAME="00689" HREF="msg00689.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Andrew Wilson <a href="mailto:andrew#aaaaaaaa,demon.co.uk">andrew#aaaaaaaa,demon.co.uk</a>, Wed 12 Aug 1998, 17:41 GMT
</LI>
<LI><strong><A NAME="00690" HREF="msg00690.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Hans-Henrik Staerfeldt <a href="mailto:hhs#cbs,dtu.dk">hhs#cbs,dtu.dk</a>, Wed 12 Aug 1998, 18:08 GMT
<UL>
<LI><strong><A NAME="00692" HREF="msg00692.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Wed 12 Aug 1998, 18:37 GMT
<UL>
<LI><EM>Message not available</EM><UL>
<LI><strong><A NAME="00697" HREF="msg00697.html">[MUD-Dev] Re: LinuxThreads and SIGUSR1 (Ref: [MUD-Dev])</A></strong>,
Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Wed 12 Aug 1998, 23:09 GMT
</LI>
</UL>
</LI>
</UL>
</LI>
<LI><strong><A NAME="00790" HREF="msg00790.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Adam Wiggins <a href="mailto:adam#angel,com">adam#angel,com</a>, Thu 20 Aug 1998, 18:25 GMT
</LI>
</UL>
</LI>
</ul>
<LI><strong><A NAME="01064" HREF="msg01064.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Fri 18 Sep 1998, 20:51 GMT
<UL>
<LI><strong><A NAME="01081" HREF="msg01081.html">[MUD-Dev] Re: clients anyone?...</A></strong>,
Andrew Wilson <a href="mailto:andrew#aaaaaaaa,demon.co.uk">andrew#aaaaaaaa,demon.co.uk</a>, Sun 20 Sep 1998, 00:58 GMT
</LI>
</UL>
</LI>
</ul>
</LI>
<LI><strong><A NAME="00651" HREF="msg00651.html">[MUD-Dev] Re: async i/o and threads (was: Re: lurker emerges</A></strong>,
James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Tue 11 Aug 1998, 04:20 GMT
</LI>
</UL></BLOCKQUOTE>
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