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/* Called when a nosenders notification happens
Copyright (C) 1994 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 <stdio.h>
#include <mach/notify.h>
/* The libpager library user must call this (and do nothing else) when
a no-senders notification is received for a pager port. P is pager
on for which the notification was received; SEQNO and MSCOUNT are
from the no-senders notification as described in <mach/notify.defs>. */
void
pager_no_senders (struct pager *p,
mach_port_seqno_t seqno,
mach_port_mscount_t mscount)
{
mach_port_t old;
int dealloc;
mutex_lock (&p->interlock);
_pager_wait_for_seqno (p, seqno);
_pager_release_seqno (p);
if (mscount > p->mscount)
{
printf ("pager strange no senders\n");
dealloc = 1;
}
else if (mscount == p->mscount)
dealloc = 1;
else
{
/* Request a new notification. The sync value is because we might
have accounted for a new sender but not actually made the send right
yet. */
mach_port_request_notification (mach_task_self (), p->port.port,
MACH_NOTIFY_NO_SENDERS, p->mscount,
p->port.port,
MACH_MSG_TYPE_MAKE_SEND_ONCE, &old);
if (old)
mach_port_deallocate (mach_task_self (), old);
dealloc = 0;
}
mutex_unlock (&p->interlock);
if (dealloc)
ports_done_with_port (p);
ports_done_with_port (p); /* for previous check_port_type */
}
/* Called by port management routines when the last send-right
to a pager has gone away. This is a dual of pager_create. */
void
pager_clean (void *arg)
{
struct pager *p = arg;
if (p->pager_state != NOTINIT)
{
mutex_lock (&p->interlock);
_pager_free_structure (p);
}
pager_clear_user_data (p->upi);
}
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