1 files changed, 50 insertions, 0 deletions
diff --git a/libiohelp/handle_io_get_conch.c b/libiohelp/handle_io_get_conch.c
new file mode 100644
index 00000000..452b3cfb
--- /dev/null
+++ b/libiohelp/handle_io_get_conch.c
@@ -0,0 +1,50 @@
+/* 
+   Copyright (C) 19931996 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. */
+
+
+#include "iohelp.h"
+
+/* Called by an I/O server when an io_get_conch message is received.
+   The user represented by USER and USER_SH wants conch C; give it
+   to her or return an error.  */
+void
+iohelp_handle_io_get_conch (struct conch *c, void *user,
+			      struct shared_io *user_sh)
+{
+  
+  if (c->holder == user)
+    {
+      if (user_sh->conch_status != USER_HAS_NOT_CONCH)
+	iohelp_fetch_shared_data (user);
+      else
+	user_sh->accessed = user_sh->written = 0;
+      
+      iohelp_put_shared_data (user);
+      user_sh->conch_status = USER_HAS_CONCH;
+    }
+  else
+    {
+      iohelp_get_conch (c);
+
+      c->holder = user;
+      c->holder_shared_page = user_sh;
+      if (user_sh->conch_status == USER_HAS_NOT_CONCH)
+	user_sh->accessed = user_sh->written = 0;
+      user_sh->conch_status = USER_HAS_CONCH;
+      iohelp_put_shared_data (user);
+    }
+}