Renesas M3T-MR100 Instrukcja Użytkownika Pobierz pdf (Strona 63)

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T_MSG

header

T_MSG

header

T_MSG

header

Message

queue

Message A Message B Message C

Figure 4.16 Message queue

There are following data queue service calls that are provided by the MR100 kernel.

• Send to Mailbox (snd_mbx, isnd_mbx)

Transmits a message. Namely, a message is dropped into the mailbox.

• Receive from Mailbox (rcv_mbx, trcv_mbx)

Receives a message. Namely, a message is retrieved from the mailbox. At this time, if the mailbox has no mes-

sages in it, the task is kept waiting until a message is sent to the mailbox.

• Receive from Mailbox (polling) (prcv_mbx, iprcv_mbx)

Receives a message. The difference from the rcv_mbx service call is that if the mailbox has no messages in it, the

task returns error code without going to a wait state.

• Reference Mailbox Status (ref_mbx, iref_mbx)

Checks to see if there are any tasks waiting for a message to be put into the target mailbox and refers to the mes-

sage present at the top of the mailbox.

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