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/* Implementation of memory_object_lock_completed for pager library
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 "priv.h"
#include "memory_object_S.h"
#include "barf.h"
/* The kernel calls this (as described in <mach/memory_object.defs>)
when a memory_object_lock_request call has completed. Read this
in combination with lock-object.c. */
kern_return_t
_pager_seqnos_memory_object_lock_completed (mach_port_t object,
mach_port_seqno_t seqno,
mach_port_t control,
vm_offset_t offset,
vm_size_t length)
{
struct pager *p;
struct lock_request *lr;
p = ports_lookup_port (0, object, _pager_class);
if (!p)
{
barf ("Bad lock completed: "
"object = %d, control = %d; offset %#x; length %#x\n",
object, control, offset, length);
return EOPNOTSUPP;
}
if (control != p->memobjcntl)
{
printf ("lock_completed: bad control port\n");
ports_port_deref (p);
return EPERM;
}
mach_port_deallocate (mach_task_self (), control);
mutex_lock (&p->interlock);
_pager_wait_for_seqno (p, seqno);
for (lr = p->lock_requests; lr; lr = lr->next)
if (lr->start == offset && lr->end == offset + length)
{
if (lr->locks_pending)
--lr->locks_pending;
if (!lr->locks_pending && !lr->pending_writes)
condition_broadcast (&p->wakeup);
break;
}
if (!lr)
barf ("orphaned lock_request: p %#x <port = %d>; offset %#x; length %#x\n",
(int) p, p->port.port_right, offset, length);
_pager_release_seqno (p, seqno);
mutex_unlock (&p->interlock);
ports_port_deref (p);
return 0;
}
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