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authorMiles Bader <miles@gnu.org>1997-08-20 20:33:03 +0000
committerMiles Bader <miles@gnu.org>1997-08-20 20:33:03 +0000
commit4709df1d86513975a004bdd58ba84158e45a650d (patch)
treeaa25c1741627e2a218d4f49d8c1c8c0d0ceba96a
parent7864068cd5e53a8fdd220927da003f803f657341 (diff)
Initial checkin.
-rw-r--r--libports/interrupted.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/libports/interrupted.c b/libports/interrupted.c
new file mode 100644
index 00000000..e4cb2fc2
--- /dev/null
+++ b/libports/interrupted.c
@@ -0,0 +1,75 @@
+/* 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 spin_lock_t interrupted_lock = SPIN_LOCK_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 ();
+
+ 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;
+ spin_unlock (&interrupted_lock);
+ rpc->interrupted_next = 0;
+ return 1;
+ }
+ }
+ 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;
+
+ 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. */
+ {
+ spin_unlock (&interrupted_lock);
+ return;
+ }
+
+ /* Nope, put it at the beginning. */
+ rpc->interrupted_next = interrupted;
+ interrupted = rpc;
+
+ spin_unlock (&interrupted_lock);
+}