int mq_close_group(mqd_t mqdes, FAR struct task_group_s *group)
{
FAR struct mqueue_inode_s *msgq;
FAR struct inode *inode;
DEBUGASSERT(mqdes != NULL && group != NULL);
/* Verify the inputs */
if (mqdes)
{
sched_lock();
/* Find the message queue associated with the message descriptor */
msgq = mqdes->msgq;
DEBUGASSERT(msgq && msgq->inode);
/* Close/free the message descriptor */
mq_desclose_group(mqdes, group);
/* Get the inode from the message queue structure */
inode = msgq->inode;
DEBUGASSERT(inode->u.i_mqueue == msgq);
/* Decrement the reference count on the inode, possibly freeing it */
mq_inode_release(inode);
sched_unlock();
}
return OK;
}
int mq_unlink(FAR const char *mq_name)
{
FAR struct inode *inode;
FAR const char *relpath = NULL;
char fullpath[MAX_MQUEUE_PATH];
int errcode;
int ret;
/* Get the full path to the message queue */
snprintf(fullpath, MAX_MQUEUE_PATH, CONFIG_FS_MQUEUE_MPATH "/%s", mq_name);
/* Get the inode for this message queue. */
sched_lock();
inode = inode_find(fullpath, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
/* Verify that what we found is, indeed, a message queue */
if (!INODE_IS_MQUEUE(inode))
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
inode_semtake();
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
goto errout_with_semaphore;
}
/* Remove the old inode from the tree. Because we hold a reference count
* on the inode, it will not be deleted now. This will set the
* FSNODEFLAG_DELETED bit in the inode flags.
*/
ret = inode_remove(fullpath);
/* inode_remove() should always fail with -EBUSY because we hae a reference
* on the inode. -EBUSY means taht the inode was, indeed, unlinked but
* thatis could not be freed because there are refrences.
*/
DEBUGASSERT(ret >= 0 || ret == -EBUSY);
UNUSED(ret);
/* Now we do not release the reference count in the normal way (by calling
* inode release. Rather, we call mq_inode_release(). mq_inode_release
* will decrement the reference count on the inode. But it will also free
* the message queue if that reference count decrements to zero. Since we
* hold one reference, that can only occur if the message queue is not
* in-use.
*/
inode_semgive();
mq_inode_release(inode);
sched_unlock();
return OK;
errout_with_semaphore:
inode_semgive();
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
sched_unlock();
return ERROR;
}
