/* 
   Copyright (C) 1995 Free Software Foundation, Inc.
   Written by Michael I. Bushnell.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "ports.h"
#include <assert.h>
#include <cthreads.h>
#include <hurd/ihash.h>
#include <mach/notify.h>

void *ports_intern_external_port (struct port_bucket *bucket,
				  mach_port_t port,
				  size_t size,
				  struct port_class *class)
{
  error_t err;
  mach_port_status_t stat;
  struct port_info *pi;
  mach_port_t foo;
  
  err = mach_port_get_receive_status (mach_task_self (), port, &stat);
  assert_perror (err);

  if (size < sizeof (struct port_info))
    size = sizeof (struct port_info);
  
  pi = malloc (size);
  assert (pi);
  
  pi->class = class;
  pi->refcnt = 1 + !!stat.mps_srights;
  pi->weakrefcnt = 0;
  pi->mscount = stat.mps_mscount;
  pi->flags = stat.mps_srights ? PORT_HAS_SENDRIGHTS : 0;
  pi->port_right = port;
  pi->current_rpcs = 0;
  pi->bucket = bucket;
  
  mutex_lock (&_ports_lock);
  
 loop:
    if (class->flags & PORT_CLASS_NO_ALLOC)
   { 
     class->flags |= PORT_CLASS_ALLOC_WAIT;
     condition_wait (&_ports_block, &_ports_lock);
     goto loop;
   }
  if (bucket->flags & PORT_BUCKET_NO_ALLOC)
    {
      bucket->flags |= PORT_BUCKET_ALLOC_WAIT;
      condition_wait (&_ports_block, &_ports_lock);
      goto loop;
    }

  err = ihash_add (bucket->htable, port, pi, &pi->hentry);
  assert_perror (err);
  pi->next = class->ports;
  pi->prevp = &class->ports;
  class->ports->prevp = &pi->next;
  class->ports = pi;
  bucket->count++;
  class->count++;
  mutex_unlock (&_ports_lock);
  
  mach_port_move_member (mach_task_self (), port, bucket->portset);

  if (stat.mps_srights)
    {
      err = mach_port_request_notification (mach_task_self (), port,
					    MACH_NOTIFY_NO_SENDERS, 
					    stat.mps_mscount, 
					    port, MACH_MSG_TYPE_MAKE_SEND_ONCE,
					    &foo);
      assert_perror (err);
      if (foo != MACH_PORT_NULL)
	mach_port_deallocate (mach_task_self (), foo);
    }

  return pi;
}