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/*
* locks.c
*
* Code for abstracting locks in IPMI
*
* Author: MontaVista Software, Inc.
* Corey Minyard <minyard@mvista.com>
* source@mvista.com
*
* Copyright 2004,2005 MontaVista Software Inc.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* Lesser General Public License (GPL) Version 2 or the modified BSD
* license below. The following disclamer applies to both licenses:
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* GNU Lesser General Public Licence
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Modified BSD Licence
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*/
#include <stdlib.h>
#include <errno.h>
#include <OpenIPMI/ipmi_debug.h>
#include <OpenIPMI/internal/ipmi_malloc.h>
#include <OpenIPMI/internal/ipmi_locks.h>
struct ipmi_lock_s
{
os_hnd_lock_t *ll_lock;
os_handler_t *os_hnd;
};
int i__ipmi_debug_locks = 0;
int
ipmi_create_lock_os_hnd(os_handler_t *os_hnd, ipmi_lock_t **new_lock)
{
ipmi_lock_t *lock;
int rv;
lock = ipmi_mem_alloc(sizeof(*lock));
if (!lock)
return ENOMEM;
lock->os_hnd = os_hnd;
if (lock->os_hnd && lock->os_hnd->create_lock) {
rv = lock->os_hnd->create_lock(lock->os_hnd, &(lock->ll_lock));
if (rv) {
ipmi_mem_free(lock);
return rv;
}
} else {
lock->ll_lock = NULL;
}
*new_lock = lock;
return 0;
}
void ipmi_destroy_lock(ipmi_lock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->destroy_lock(lock->os_hnd, lock->ll_lock);
ipmi_mem_free(lock);
}
void ipmi_lock(ipmi_lock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->lock(lock->os_hnd, lock->ll_lock);
}
void ipmi_unlock(ipmi_lock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->unlock(lock->os_hnd, lock->ll_lock);
}
struct ipmi_rwlock_s
{
os_hnd_rwlock_t *ll_lock;
os_handler_t *os_hnd;
};
int
ipmi_create_rwlock_os_hnd(os_handler_t *os_hnd, ipmi_rwlock_t **new_lock)
{
ipmi_rwlock_t *lock;
int rv;
lock = ipmi_mem_alloc(sizeof(*lock));
if (!lock)
return ENOMEM;
lock->os_hnd = os_hnd;
if (lock->os_hnd && lock->os_hnd->create_lock) {
rv = lock->os_hnd->create_rwlock(lock->os_hnd, &(lock->ll_lock));
if (rv) {
ipmi_mem_free(lock);
return rv;
}
} else {
lock->ll_lock = NULL;
}
*new_lock = lock;
return 0;
}
void ipmi_destroy_rwlock(ipmi_rwlock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->destroy_rwlock(lock->os_hnd, lock->ll_lock);
ipmi_mem_free(lock);
}
void ipmi_rwlock_read_lock(ipmi_rwlock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->read_lock(lock->os_hnd, lock->ll_lock);
}
void ipmi_rwlock_read_unlock(ipmi_rwlock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->read_unlock(lock->os_hnd, lock->ll_lock);
}
void ipmi_rwlock_write_lock(ipmi_rwlock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->write_lock(lock->os_hnd, lock->ll_lock);
}
void ipmi_rwlock_write_unlock(ipmi_rwlock_t *lock)
{
if (lock->ll_lock)
lock->os_hnd->write_unlock(lock->os_hnd, lock->ll_lock);
}
#ifdef IPMI_CHECK_LOCKS
/* Set a breakpoint here to detect locking errors. */
void
ipmi_report_lock_error(os_handler_t *handler, char *str)
{
handler->log(handler, IPMI_LOG_WARNING, "%s", str);
}
void
ipmi_check_lock(ipmi_lock_t *lock, char *str)
{
if ((!DEBUG_LOCKS) || (!lock) || (!lock->ll_lock))
return;
if (! lock->os_hnd->is_locked(lock->os_hnd, lock->ll_lock))
IPMI_REPORT_LOCK_ERROR(lock->os_hnd, str);
}
#endif
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