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/* Keeping track of thread interruption
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "ports.h"
static pthread_spinlock_t interrupted_lock = PTHREAD_SPINLOCK_INITIALIZER;
/* True if some active rpc has been interrupted. */
static struct rpc_info *interrupted = 0;
/* If the current thread's rpc has been interrupted with
ports_interrupt_rpcs, return true (and clear the interrupted flag). */
int
ports_self_interrupted ()
{
struct rpc_info **rpc_p, *rpc;
thread_t self = hurd_thread_self ();
pthread_spin_lock (&interrupted_lock);
for (rpc_p = &interrupted; *rpc_p; rpc_p = &rpc->interrupted_next)
{
rpc = *rpc_p;
if (rpc->thread == self)
{
*rpc_p = rpc->interrupted_next;
pthread_spin_unlock (&interrupted_lock);
rpc->interrupted_next = 0;
return 1;
}
}
pthread_spin_unlock (&interrupted_lock);
return 0;
}
/* Add RPC to the list of rpcs that have been interrupted. */
void
_ports_record_interruption (struct rpc_info *rpc)
{
struct rpc_info *i;
pthread_spin_lock (&interrupted_lock);
/* See if RPC is already in the interrupted list. */
for (i = interrupted; i; i = i->interrupted_next)
if (i == rpc)
/* Yup, it is, so just leave it there. */
{
pthread_spin_unlock (&interrupted_lock);
return;
}
/* Nope, put it at the beginning. */
rpc->interrupted_next = interrupted;
interrupted = rpc;
pthread_spin_unlock (&interrupted_lock);
}
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