/* Pager creation
   Copyright (C) 1994, 1995, 1996 Free Software Foundation

   This program 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.

   This program 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 <stdio.h>

#include "priv.h"

/* Create and return a new pager with user info UPI.  */
struct pager *
pager_create (struct user_pager_info *upi,
	      struct port_bucket *bucket,
	      boolean_t may_cache,
	      memory_object_copy_strategy_t copy_strategy,
	      boolean_t notify_on_evict)
{
  struct pager *p;

  errno = ports_create_port (_pager_class, bucket, sizeof (struct pager), &p);
  if (errno)
    return 0;

  p->upi = upi;
  p->pager_state = NOTINIT;
  pthread_mutex_init (&p->interlock, NULL);
  pthread_cond_init (&p->wakeup, NULL);
  p->lock_requests = 0;
  p->attribute_requests = 0;
  p->may_cache = may_cache;
  p->copy_strategy = copy_strategy;
  p->notify_on_evict = notify_on_evict;
  p->memobjcntl = MACH_PORT_NULL;
  p->memobjname = MACH_PORT_NULL;
  p->noterm = 0;
  p->termwaiting = 0;
  p->pagemap = 0;
  p->pagemapsize = 0;

  return p;
}

/* Provide a human-readable description of the given pager object.  */
static error_t
format_debug_info (const void *port, char *buffer, size_t size)
{
  const struct pager *pager = port;
  const struct port_info *pi = port;

  snprintf (buffer, size,
	    "bucket: %s, class: %s, may_cache: %d",
	    pi->bucket->label,
	    pi->class->label,
	    /* XXX I have no idea what might be interesting to print
	       here, but it is straight forward to add stuff.  */
	    pager->may_cache);

  return 0;
}

/* This causes the function to be run at startup by compiler magic. */
static void create_class (void) __attribute__ ((constructor));

static void
create_class ()
{
  _pager_class = ports_create_class (_pager_clean, _pager_real_dropweak);
  ports_label_class (_pager_class, "_pager_class", format_debug_info);
  (void) &create_class;		/* Avoid warning */
}