1999-11-18 Roland McGrath <roland@baalperazim.frob.com>

        * hurd/hurdsig.c (_hurdsig_init): If __hurd_threadvar_stack_mask is
        nonzero, use cthread_fork to create the signal thread.
        * hurd/msgportdemux.c (_hurd_msgport_receive): Initialize
        _hurd_msgport_thread here (to self).
        * sysdeps/mach/hurd/fork.c (__fork): When __hurd_sigthread_stack_end
        is zero, instead compute child signal thread's starting SP from parent
        signal thread's current SP and the threadvar_stack variables.
        * hurd/Versions (GLIBC_2.1.3): Add cthread_fork, cthread_detach.
        These are now referenced weakly by _hurdsig_init.

        * hurd/report-wait.c (_S_msg_report_wait): Fix typo:
        &_hurd_itimer_thread not &_hurd_msgport_thread.

1999-10-01  Roland McGrath  <roland@baalperazim.frob.com>

        * hurd/hurdfchdir.c (_hurd_change_directory_port_from_fd): Rewrite
        without HURD_DPORT_USE to clean up warnings.
        * hurd/dtable.c (get_dtable_port): Likewise.

        * hurd/hurdioctl.c (rectty_dtable): Renamed to install_ctty.
        (install_ctty): Do the changing of the cttyid port cell here, inside
        the critical section while we holding the dtable lock.
        (_hurd_setcttyid, tiocsctty, tiocnotty): Use that instead of changing
        the port cell and calling rectty_dtable.
        (_hurd_locked_install_cttyid): New function, split out of install_ctty.
        (install_ctty): Use it inside a critical section, with the lock held.
        * sysdeps/mach/hurd/setsid.c (__setsid): Use
        _hurd_locked_install_cttyid to effect the cttyid and dtable changes
        after proc_setsid, having held the dtable lock throughout.
        * hurd/dtable.c (ctty_new_pgrp): With the dtable lock held, check the
        cttyid port for null and bail out early if so.  The dtable lock
        serializes us after any cttyid change and its associated dtable update.

1 files changed, 7 insertions, 3 deletions

diff --git a/hurd/msgportdemux.c b/hurd/msgportdemux.c
index 4250affd0b..7f61758cc3 100644
--- a/hurd/msgportdemux.c
+++ b/hurd/msgportdemux.c
@@ -1,5 +1,5 @@
 /* Demux messages sent on the signal port.
-   Copyright (C) 1991, 1992, 1994, 1995, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1991,92,94,95,97,99 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -57,8 +57,12 @@ _hurd_msgport_receive (void)
 {
   /* Get our own sigstate cached so we never again have to take a lock to
      fetch it.  There is much code in hurdsig.c that operates with some
-     sigstate lock held, which will deadlock with _hurd_thread_sigstate.  */
-  (void) _hurd_self_sigstate ();
+     sigstate lock held, which will deadlock with _hurd_thread_sigstate.
+
+     Furthermore, in the cthreads case this is the convenient spot
+     to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init).  */
+
+  _hurd_msgport_thread = _hurd_self_sigstate ()->thread;
 
   while (1)
     (void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport);