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/* Handle interruping rpcs because of notification
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 "ports.h"
/* A linked list of ports for which notification has been requested. */
struct ports_notify *_ports_notifications = 0;
/* Free lists for notify structures. */
struct ports_notify *_ports_free_ports_notifies = 0;
struct rpc_notify *_ports_free_rpc_notifies = 0;
/* Interrupt any rpcs on OBJECT that have requested such. */
void
ports_interrupt_notified_rpcs (void *object,
mach_port_t port, mach_msg_id_t what)
{
struct ports_notify *np;
mutex_lock (&_ports_lock);
for (np = _ports_notifications; np; np = np->next)
if (np->port == port && np->what == what)
{
struct rpc_notify *req;
for (req = np->reqs; req; req = req->next_req)
if (req->pending)
{
req->pending--;
hurd_thread_cancel (req->rpc->thread);
}
break;
}
mutex_unlock (&_ports_lock);
}
static void
remove_req (struct rpc_notify *req)
{
struct ports_notify *np = req->notify;
/* Take REQ out of the list of notified rpcs. */
if (req->next_req)
req->next_req->prev_req_p = req->prev_req_p;
*req->prev_req_p = req->next_req;
if (np->reqs == 0)
/* Now NP has no more reqests, so we can free it too. */
{
/* Take NP out of the active list... */
if (np->next)
np->next->prevp = np->prevp;
*np->prevp = np->next;
/* And put it on the free list. */
np->next = _ports_free_ports_notifies;
_ports_free_ports_notifies = np;
if (np->pending)
/* And cancel the associated notification. */
{
mach_port_t old;
error_t err =
mach_port_request_notification (mach_task_self (), np->port,
np->what, 0, MACH_PORT_NULL,
MACH_MSG_TYPE_MAKE_SEND_ONCE,
&old);
if (! err && old != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), old);
}
}
}
/* Remove RPC from the list of notified rpcs, cancelling any pending
notifications. _PORTS_LOCK should be held. */
void
_ports_remove_notified_rpc (struct rpc_info *rpc)
{
struct rpc_notify *req = rpc->notifies;
if (req)
/* Cancel RPC's notify requests. */
{
struct rpc_notify *last = req;
while (last->next)
{
remove_req (last);
last = last->next;
}
remove_req (last);
/* Put the whole chain on the free list. */
last->next = _ports_free_rpc_notifies;
_ports_free_rpc_notifies = req;
}
}
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