Initial revision

1 files changed, 86 insertions, 0 deletions

diff --git a/libports/begin-rpc.c b/libports/begin-rpc.c
new file mode 100644
index 00000000..e1541b1d
--- /dev/null
+++ b/libports/begin-rpc.c
@@ -0,0 +1,86 @@
+/* 
+   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;
+  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;
+}
+
+