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#include "wilc_msgqueue.h"
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/slab.h>
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
int wilc_mq_create(struct message_queue *mq)
{
spin_lock_init(&mq->lock);
sema_init(&mq->sem, 0);
INIT_LIST_HEAD(&mq->msg_list);
mq->recv_count = 0;
mq->exiting = false;
return 0;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
int wilc_mq_destroy(struct message_queue *mq)
{
struct message *msg;
mq->exiting = true;
/* Release any waiting receiver thread. */
while (mq->recv_count > 0) {
up(&mq->sem);
mq->recv_count--;
}
while (!list_empty(&mq->msg_list)) {
msg = list_first_entry(&mq->msg_list, struct message, list);
list_del(&msg->list);
kfree(msg->buf);
}
return 0;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
int wilc_mq_send(struct message_queue *mq,
const void *send_buf, u32 send_buf_size)
{
unsigned long flags;
struct message *new_msg = NULL;
if (!mq || (send_buf_size == 0) || !send_buf)
return -EINVAL;
if (mq->exiting)
return -EFAULT;
/* construct a new message */
new_msg = kmalloc(sizeof(*new_msg), GFP_ATOMIC);
if (!new_msg)
return -ENOMEM;
new_msg->len = send_buf_size;
INIT_LIST_HEAD(&new_msg->list);
new_msg->buf = kmemdup(send_buf, send_buf_size, GFP_ATOMIC);
if (!new_msg->buf) {
kfree(new_msg);
return -ENOMEM;
}
spin_lock_irqsave(&mq->lock, flags);
/* add it to the message queue */
list_add_tail(&new_msg->list, &mq->msg_list);
spin_unlock_irqrestore(&mq->lock, flags);
up(&mq->sem);
return 0;
}
/*!
* @author syounan
* @date 1 Sep 2010
* @note copied from FLO glue implementatuion
* @version 1.0
*/
int wilc_mq_recv(struct message_queue *mq,
void *recv_buf, u32 recv_buf_size, u32 *recv_len)
{
struct message *msg;
unsigned long flags;
if (!mq || (recv_buf_size == 0) || !recv_buf || !recv_len)
return -EINVAL;
if (mq->exiting)
return -EFAULT;
spin_lock_irqsave(&mq->lock, flags);
mq->recv_count++;
spin_unlock_irqrestore(&mq->lock, flags);
down(&mq->sem);
spin_lock_irqsave(&mq->lock, flags);
if (list_empty(&mq->msg_list)) {
spin_unlock_irqrestore(&mq->lock, flags);
up(&mq->sem);
return -EFAULT;
}
/* check buffer size */
msg = list_first_entry(&mq->msg_list, struct message, list);
if (recv_buf_size < msg->len) {
spin_unlock_irqrestore(&mq->lock, flags);
up(&mq->sem);
return -EOVERFLOW;
}
/* consume the message */
mq->recv_count--;
memcpy(recv_buf, msg->buf, msg->len);
*recv_len = msg->len;
list_del(&msg->list);
kfree(msg->buf);
kfree(msg);
spin_unlock_irqrestore(&mq->lock, flags);
return 0;
}
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