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/*
Copyright (C) 1995 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 <cthreads.h>
error_t
ports_begin_rpc (void *portstruct, struct rpc_info *info)
{
struct port_info *pi = portstruct;
mutex_lock (&_ports_lock);
start_over:
/* If our receive right is gone, then abandon the RPC. */
if (pi->port_right == MACH_PORT_NULL)
{
mutex_unlock (&_ports_lock);
return EDIED;
}
/* Check to see if RPC's are inhibited */
while (_ports_flags & (_PORTS_INHIBITED | _PORTS_INHIBIT_WAIT))
{
_ports_flags |= _PORTS_BLOCKED;
condition_wait (&_ports_block, &_ports_lock);
}
/* Check to see if RPC's are inhibited for this port's bucket */
if (pi->bucket->flags & (PORT_BUCKET_INHIBITED | PORT_BUCKET_INHIBIT_WAIT))
{
pi->bucket->flags |= PORT_BUCKET_BLOCKED;
condition_wait (&_ports_block, &_ports_lock);
goto start_over;
}
/* Check to see if RPC's are inhibited for this port's class */
if (pi->class->flags & (PORT_CLASS_INHIBITED | PORT_CLASS_INHIBIT_WAIT))
{
pi->class->flags |= PORT_CLASS_BLOCKED;
condition_wait (&_ports_block, &_ports_lock);
goto start_over;
}
/* Check to see if RPC's are inhibited for this port itself */
if (pi->flags & (PORT_INHIBITED | PORT_INHIBIT_WAIT))
{
pi->flags |= PORT_BLOCKED;
condition_wait (&_ports_block, &_ports_lock);
goto start_over;
}
/* Record that that an RPC is in progress */
info->thread = hurd_thread_self ();
info->next = pi->current_rpcs;
info->notifies = 0;
if (pi->current_rpcs)
pi->current_rpcs->prevp = &info->next;
info->prevp = &pi->current_rpcs;
pi->current_rpcs = info;
pi->class->rpcs++;
pi->bucket->rpcs++;
_ports_total_rpcs++;
mutex_unlock (&_ports_lock);
return 0;
}
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