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daemon@ATHENA.MIT.EDU (HBEDI.US.ORACLE.COM)
Mon May 4 19:33:41 1998
Date: 04 May 98 14:07:47 -0700
From: "HBEDI.US.ORACLE.COM" <HBEDI@us.oracle.com>
To: pthreads@MIT.EDU
Cc: HBEDI@us.oracle.com
Hi ,
I am Harmeek , I am working with Oracle Development on Sequent DYNIX/PTX OS
.
Sequent does not have either Kernel threads nor any user level
implementation
.
It does not have thread safe or Reenterant libraries .
To make some of the products work we need to have a user level
implementation
on Sequent . I was looking thru the MIT implementation to have a fair idea
of the Code .
I did have a couple of questions in this regard . I would appreciate if you
could help me .
a) File fd_kern.c . Why is the function fd_kern_exec called to make
fd == fd[fd]->fd.i ? Why is this nesessary during the exec call ?
b) After the fork if the parent closes it's descriptor's
the child should still be able to still see it . I looked at the
wrappers for exec , fork and fork_kern_exec . Where exactly it is
taken care of ? .
c) Since the MIT implemenation catches SIGCHLD , SIGALRM for waking up
threads on sleep and wait calls , any redirection by the Application
would cause undefined behaviour .? Is my understanding correct .
I would appreciate if you could help me in this regard .
Thanks for your time and patience .
Regards
Harmeek
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