예제 #1
0
enum xp_retval
xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
	    u16 nentries, u32 assigned_limit, u32 idle_limit)
{
	struct xpc_registration *registration;

	DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
	DBUG_ON(payload_size == 0 || nentries == 0);
	DBUG_ON(func == NULL);
	DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);

	if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE)
		return xpPayloadTooBig;

	registration = &xpc_registrations[ch_number];

	if (mutex_lock_interruptible(&registration->mutex) != 0)
		return xpInterrupted;

	
	if (registration->func != NULL) {
		mutex_unlock(&registration->mutex);
		return xpAlreadyRegistered;
	}

	
	registration->entry_size = XPC_MSG_SIZE(payload_size);
	registration->nentries = nentries;
	registration->assigned_limit = assigned_limit;
	registration->idle_limit = idle_limit;
	registration->key = key;
	registration->func = func;

	mutex_unlock(&registration->mutex);

	xpc_interface.connect(ch_number);

	return xpSuccess;
}
예제 #2
0
/*
 * Register for automatic establishment of a channel connection whenever
 * a partition comes up.
 *
 * Arguments:
 *
 *	ch_number - channel # to register for connection.
 *	func - function to call for asynchronous notification of channel
 *	       state changes (i.e., connection, disconnection, error) and
 *	       the arrival of incoming messages.
 *      key - pointer to optional user-defined value that gets passed back
 *	      to the user on any callouts made to func.
 *	payload_size - size in bytes of the XPC message's payload area which
 *		       contains a user-defined message. The user should make
 *		       this large enough to hold their largest message.
 *	nentries - max #of XPC message entries a message queue can contain.
 *		   The actual number, which is determined when a connection
 * 		   is established and may be less then requested, will be
 *		   passed to the user via the xpcConnected callout.
 *	assigned_limit - max number of kthreads allowed to be processing
 * 			 messages (per connection) at any given instant.
 *	idle_limit - max number of kthreads allowed to be idle at any given
 * 		     instant.
 */
enum xpc_retval
xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
		u16 nentries, u32 assigned_limit, u32 idle_limit)
{
	struct xpc_registration *registration;


	DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
	DBUG_ON(payload_size == 0 || nentries == 0);
	DBUG_ON(func == NULL);
	DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);

	registration = &xpc_registrations[ch_number];

	if (mutex_lock_interruptible(&registration->mutex) != 0) {
		return xpcInterrupted;
	}

	/* if XPC_CHANNEL_REGISTERED(ch_number) */
	if (registration->func != NULL) {
		mutex_unlock(&registration->mutex);
		return xpcAlreadyRegistered;
	}

	/* register the channel for connection */
	registration->msg_size = XPC_MSG_SIZE(payload_size);
	registration->nentries = nentries;
	registration->assigned_limit = assigned_limit;
	registration->idle_limit = idle_limit;
	registration->key = key;
	registration->func = func;

	mutex_unlock(&registration->mutex);

	xpc_interface.connect(ch_number);

	return xpcSuccess;
}