/* Demux messages sent on the signal port.

   Copyright (C) 1991-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#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.

     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);

}