[222] in Pthreads mailing list archive
Re: BUG IN PTHREADS 1_60BETA4
daemon@ATHENA.MIT.EDU (Christopher Provenzano)
Fri Dec 1 05:59:37 1995
To: "SethMeister G." <consp05@bingsuns.cc.binghamton.edu>
Cc: pthreads@MIT.EDU
In-Reply-To: Your message of "Tue, 28 Nov 1995 17:48:43 EST."
<199511282248.RAA06886@bingsun2-gw>
Date: Fri, 01 Dec 1995 05:08:42 EST
From: Christopher Provenzano <proven@MIT.EDU>
> Hi there,
>
> I just wanted to report 2 bugs in the pthreads library:
>
> (1) In the scanf stdio library function, the mutex held while input
> was performed was locked TWICE once before the stream manip, and once
> after (it should be unlocked after, but it is NOT ).
>
> (2) This one is NASTY - On Solaris 2.4, fork() does not work properly
> 100% of the time. eg: if one tries the following code:
>
> for ( int i = 0; i < 100; i++ )
> if ( fork() == 0 ) exit(0);
>
> Sometimes, the process LOCKS UP totally.
>
>
> Please send me an acknowledgement once you receive this. Thank you.
OK, I got them and have fixed 1 and will try and fix 2. Number 2 is not a
lockup but a bug in Solaris where if the parent gets a SIGCHLD and tries to
reinstall the signal handler and does not do a wait() in the signal handler
then the kernel will never mark the signal as handled and will reissue the
signal when the handler returns.
CAP
