13.4.5 Mailbox information
The number of mailbox information items that can be specified is defined as being within the range of 0 to 127.
Note The CF78V4 outputs to the system information header file the correspondence between the mailbox names and IDs, in the following format. Consequently, mailbox names can be used in the place of IDs by including the relevant system information header file using the processing program.
Specifies the attributes (task queuing method, message queuing method) of the mailbox.
The keywords that can be specified for mbxatr are TA_TFIFO, TA_MFIFO and TA_MPRI.
The keywords that can be specified for mbxatr are TA_TFIFO, TA_MFIFO and TA_MPRI.
TA_TFIFO: If the message could not be received from the mailbox (no messages were queued in the wait queue) when rcv_mbx or trcv_mbx is issued, the task is queued to the mailbox wait queue in the order of message reception request.
TA_MFIFO: If a task is not queued to the mailbox wait queue when snd_mbx is issued, the message is queued to the mailbox wait queue in the order of message transmission request.
TA_MPRI: If a task is not queued to the mailbox wait queue when snd_mbx is issued, the message is queued to the mailbox wait queue in the order of message priority.