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Roland McGrath
1995-02-18 01:27:10 +00:00
commit 28f540f45b
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hurd/msgportdemux.c Normal file
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/* Demux messages sent on the signal port.
Copyright (C) 1991, 1992, 1994, 1995 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
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <hurd/signal.h>
#include <stddef.h>
struct demux
{
struct demux *next;
boolean_t (*demux) (mach_msg_header_t *inp,
mach_msg_header_t *outp);
};
struct demux *_hurd_msgport_demuxers = NULL;
extern boolean_t __msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
static boolean_t
msgport_server (mach_msg_header_t *inp,
mach_msg_header_t *outp)
{
extern boolean_t _S_msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
extern boolean_t _S_exc_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
struct demux *d;
for (d = _hurd_msgport_demuxers; d != NULL; d = d->next)
if ((*d->demux) (inp, outp))
return 1;
return (_S_exc_server (inp, outp) ||
_S_msg_server (inp, outp));
}
/* This is the code that the signal thread runs. */
void
_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 ();
while (1)
(void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport);
}