1 files changed, 142 insertions, 0 deletions
diff --git a/source4/lib/mutex.c b/source4/lib/mutex.c
new file mode 100644
index 0000000000..1be23a52ba
--- /dev/null
+++ b/source4/lib/mutex.c
@@ -0,0 +1,142 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba mutex/lock functions
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) James J Myers 2003
+   
+   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"
+	 
+static mutex_t mutex_list[MUTEX_MAX];
+
+/* the registered mutex handlers */
+static struct {
+	const char *name;
+	struct mutex_ops ops;
+} mutex_handlers;
+
+int mutex_lock_by_id(enum mutex_id id, const char *name)
+{
+	return mutex_lock(&mutex_list[id], name);
+}
+
+int mutex_unlock_by_id(enum mutex_id id, const char *name)
+{
+	return mutex_unlock(&mutex_list[id], name);
+}
+
+int mutex_init(mutex_t *mutex, const char *name)
+{
+	if (mutex_handlers.ops.mutex_init) {
+		return mutex_handlers.ops.mutex_init(mutex, name);
+	}
+	return 0;
+}
+
+int mutex_destroy(mutex_t *mutex, const char *name)
+{
+	if (mutex_handlers.ops.mutex_destroy) {
+		return mutex_handlers.ops.mutex_destroy(mutex, name);
+	}
+	return 0;
+}
+
+int mutex_lock(mutex_t *mutex, const char *name)
+{
+	if (mutex_handlers.ops.mutex_lock) {
+		return mutex_handlers.ops.mutex_lock(mutex, name);
+	}
+	return 0;
+}
+
+int mutex_unlock(mutex_t *mutex, const char *name)
+{
+	if (mutex_handlers.ops.mutex_unlock) {
+		return mutex_handlers.ops.mutex_unlock(mutex, name);
+	}
+	return 0;
+}
+
+/* read/write lock routines */
+
+int rwlock_init(rwlock_t *rwlock, const char *name)
+{
+	if (mutex_handlers.ops.rwlock_init) {
+		return mutex_handlers.ops.rwlock_init(rwlock, name);
+	}
+	return 0;
+}
+
+int rwlock_destroy(rwlock_t *rwlock, const char *name)
+{
+	if (mutex_handlers.ops.rwlock_destroy) {
+		return mutex_handlers.ops.rwlock_destroy(rwlock, name);
+	}
+	return 0;
+}
+
+int rwlock_lock_write(rwlock_t *rwlock, const char *name)
+{
+	if (mutex_handlers.ops.rwlock_lock_write) {
+		return mutex_handlers.ops.rwlock_lock_write(rwlock, name);
+	}
+	return 0;
+}
+
+int rwlock_lock_read(rwlock_t *rwlock, const char *name)
+{
+	if (mutex_handlers.ops.rwlock_lock_read) {
+		return mutex_handlers.ops.rwlock_lock_read(rwlock, name);
+	}
+	return 0;
+}
+
+int rwlock_unlock(rwlock_t *rwlock, const char *name)
+{
+	if (mutex_handlers.ops.rwlock_unlock) {
+		return mutex_handlers.ops.rwlock_unlock(rwlock, name);
+	}
+	return 0;
+}
+
+
+/*
+  register a set of mutex/rwlock handlers. 
+  Should only be called once in the execution of smbd.
+*/
+BOOL register_mutex_handlers(const char *name, struct mutex_ops *ops)
+{
+	if (mutex_handlers.name != NULL) {
+		/* it's already registered! */
+		DEBUG(2,("mutex handler '%s' already registered - failed '%s'\n", 
+			 mutex_handlers.name, name));
+		return False;
+	}
+
+	mutex_handlers.name = name;
+	mutex_handlers.ops = *ops;
+
+	if (mutex_handlers.ops.mutex_init) {
+		enum mutex_id id;
+		for (id=0; id < MUTEX_MAX; id++) {
+			mutex_handlers.ops.mutex_init(&mutex_list[id], "mutex_list");
+		}
+	}
+
+	DEBUG(2,("mutex handler '%s' registered\n", name));
+	return True;
+}
+