APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY Previous Years Question Paper & Answer

Course : B.Tech

Semester : SEMESTER 6

Subject : Embedded System

Year : 2018

Term : MARCH

Scheme : 2015 Full Time

Course Code : EC 308

Page:61





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Mailbox Type
Permitted by an OS
‏ا تا صم‎ അത്ത க்‌ டு

Iti One Message Multiple
பணக்‌ Per Mailbox റില്‍
Messages with a Priority
Queueing Parameter for
Up (a) each message

OS Functions for the Mailbox
Create Write Accept Read Query
(Post) 7 (Pend)

⋅⋅∙⋅ 0
‏.م‎ 7.9 (9) Mailbox types at the different operating systems (OSes) (0) Initialization and
functions for a mailbox at an OS

3. OSMBoxWait (pend) waits for a mailbox message, which is read when received.

no wail
4. OSMBoxAccept reads the current message pointer after checking the presence yes OF 10 (
Deletes the mailbox when read.

5. OSMBoxQuery queries the mailbox when read and not needed later.
An ISR can post (but not wait) into the mailbox of a task.

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