Message port

An item through which a task receives messages.

Description

A message port is an item through which a task receives messages.

Folio

kernel

Item Type

MSGPORTNODE

Create

CreateMsgPort(), CreateItem()

Delete

DeleteMsgPort(), DeleteItem()

Query

FindMsgPort(), FindItem(), FindNamedItem(), FindVersionedItem()

Use

WaitPort(), GetMsg(), SendMsg(), SendSmallMsg(), ReplyMsg(), ReplySmallMsg()

Tags

CREATEPORT_TAG_SIGNAL: (int32) Create. Whenever a message arrives at a message port, the kernel sends a signal to the owner of the message port. This tag lets you specify which signal should be sent. If this tag is not provided, the kernel will allocate a signal for the message port itself.

CREATEPORT_TAG_USERDATA: (void *) Create. Lets you specify the 32-bit value that gets put into the mp_UserData field of the MsgPort structure. This can be anything you want, and is sometimes useful to idenify a message port.