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/* map.c - Generic map implementation.
Copyright (C) 2007, 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
GNU Hurd 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 3 of the
License, or (at your option) any later version.
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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with GNU Hurd. If not, see
<http://www.gnu.org/licenses/>. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "pager.h"
extern ss_mutex_t maps_lock;
bool
pager_init (struct pager *pager)
{
assert (pager->fault);
assert (pager->length);
assert ((pager->length & (PAGESIZE - 1)) == 0);
debug (3, "Creating pager with size %x (%d pages)",
pager->length, pager->length / PAGESIZE);
pager->maps = 0;
pager->lock = 0;
return true;
}
void
pager_deinit (struct pager *pager)
{
maps_lock_lock ();
/* Destroy all but one references with MAPS_LOCK held. When we
destroy the last reference, map_destroy will call the pager's no
ref call back, which may destroy PAGER. */
ss_mutex_lock (&pager->lock);
assert (pager->maps);
for (;;)
{
struct map *map = pager->maps;
map_disconnect (map);
if (! map->map_list_next)
/* The last reference. */
{
ss_mutex_unlock (&pager->lock);
maps_lock_unlock ();
map_destroy (map);
return;
}
ss_mutex_unlock (&pager->lock);
/* It is safe to call with with MAPS_LOCK held as we know that
this is not the last refence. */
map_destroy (map);
ss_mutex_lock (&pager->lock);
}
}
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