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/*
Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
This file is part of the GNU Hurd.
The GNU Hurd 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.
The 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
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"
#include <hurd.h>
error_t
ports_inhibit_class_rpcs (struct port_class *class)
{
error_t err = 0;
pthread_mutex_lock (&_ports_lock);
if (class->flags & (PORT_CLASS_INHIBITED | PORT_CLASS_INHIBIT_WAIT))
err = EBUSY;
else
{
int this_one = 0;
pthread_rwlock_rdlock (&_ports_htable_lock);
HURD_IHASH_ITERATE (&_ports_htable, portstruct)
{
struct rpc_info *rpc;
struct port_info *pi = portstruct;
if (pi->class != class)
continue;
for (rpc = pi->current_rpcs; rpc; rpc = rpc->next)
{
/* Avoid cancelling the calling thread. */
if (rpc->thread == hurd_thread_self ())
this_one = 1;
else
hurd_thread_cancel (rpc->thread);
}
}
pthread_rwlock_unlock (&_ports_htable_lock);
while (class->rpcs > this_one)
{
class->flags |= PORT_CLASS_INHIBIT_WAIT;
if (pthread_hurd_cond_wait_np (&_ports_block, &_ports_lock))
/* We got cancelled. */
{
err = EINTR;
break;
}
}
class->flags &= ~PORT_CLASS_INHIBIT_WAIT;
if (! err)
class->flags |= PORT_CLASS_INHIBITED;
}
pthread_mutex_unlock (&_ports_lock);
return err;
}
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