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/*
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;
}
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