Initial revision

1 files changed, 59 insertions, 0 deletions

diff --git a/libpager/lock-completed.c b/libpager/lock-completed.c
new file mode 100644
index 00000000..de99bf6f
--- /dev/null
+++ b/libpager/lock-completed.c
@@ -0,0 +1,59 @@
+/* Implementation of memory_object_lock_completed for pager library
+   Copyright (C) 1994 Free Software Foundation
+
+   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. */
+
+
+/* A lock_request has finished.  Do our part of the wakeup
+   process.  */
+seqnos_memory_object_lock_completed (mach_port_t object,
+				     mach_port_seqno_t seqno,
+				     mach_port_t control,
+				     vm_offset_t offset,
+				     vm_size_t length)
+{
+  struct controlinfo *ci;
+  struct lock_request *lr;
+  int wakeup;
+
+  if (!(ci = check_port_type (object, pager_port_type)))
+    {
+      printf ("Bad lock completed\n");
+      return EOPNOTSUPP;
+    }
+
+  if (control != ci->memobjcntl)
+    {
+      printf ("lock_completed: bad control port\n");
+      return EPERM;
+    }
+
+  mach_port_deallocate (mach_task_self (), control);
+
+  mutex_lock (&ci->interlock);
+  _pager_wait_for_seqno (ci, seqno);
+
+  wakeup = 0;
+  for (lr = ci->lock_requests; lr; lr = lr->next)
+    if (lr->start == offset && lr->end == offset + length
+	&& !--lr->locks_pending && !lr->pending_writes)
+      wakeup = 1;
+  condition_broadcast (&ci->wakeup);
+
+  _pager_release_seqno (ci);
+  mutex_unlock (&ci->interlock);
+
+  return 0;
+}