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-rw-r--r--source4/lib/server_mutex.c58
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diff --git a/source4/lib/server_mutex.c b/source4/lib/server_mutex.c
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+/*
+ Unix SMB/CIFS implementation.
+ Authenticate against a remote domain
+ Copyright (C) Andrew Tridgell 1992-2002
+ Copyright (C) Andrew Bartlett 2002
+
+ 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 of the License, 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 "includes.h"
+
+/* For reasons known only to MS, many of their NT/Win2k versions
+ need serialised access only. Two connections at the same time
+ may (in certain situations) cause connections to be reset,
+ or access to be denied.
+
+ This locking allows smbd's mutlithread architecture to look
+ like the single-connection that NT makes. */
+
+static char *mutex_server_name;
+/* FIXME. ref_count should be allocated per name... JRA. */
+size_t ref_count;
+
+BOOL grab_server_mutex(const char *name)
+{
+ mutex_server_name = strdup(name);
+ if (!mutex_server_name) {
+ DEBUG(0,("grab_server_mutex: malloc failed for %s\n", name));
+ return False;
+ }
+ if (!secrets_named_mutex(mutex_server_name, 10, &ref_count)) {
+ DEBUG(10,("grab_server_mutex: failed for %s\n", name));
+ SAFE_FREE(mutex_server_name);
+ return False;
+ }
+
+ return True;
+}
+
+void release_server_mutex(void)
+{
+ if (mutex_server_name) {
+ secrets_named_mutex_release(mutex_server_name, &ref_count);
+ SAFE_FREE(mutex_server_name);
+ }
+}