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Anchor
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µC/OS-II ( |
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µC/OS-III ( |
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Note |
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| rowspan | 3 |
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| rowspan | 3 |
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| rowspan | 3 |
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(1) |
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| rowspan | 4 |
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| rowspan | 4 |
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| rowspan | 4 |
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(2) |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 5 |
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(3) |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 5 |
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| rowspan | 4 |
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| rowspan | 4 |
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| rowspan | 4 |
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(4) |
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| rowspan | 6 |
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| rowspan | 6 |
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| rowspan | 6 |
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(4) |
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| rowspan | 4 |
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| rowspan | 4 |
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| rowspan | 4 |
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(5) |
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Table C-9 Message Mailbox API
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TC-9(1) In µC/OS-III, there is no “accept” API since this feature is built into the OSQPend() by specifying the OS_OPT_PEND_NON_BLOCKING option.
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TC-9(2) In µC/OS-II, OSMboxCreate() returns the address of an OS_EVENT, which is used as the “handle” to the message mailbox. In µC/OS-III, the application must allocate storage for an OS_Q, which serves the same purpose as the OS_EVENT. The benefit in µC/OS-III is that it is not necessary to predetermine the number of message queues at compile time. Also, to create the equivalent of a message mailbox, you would specify 1 for the max_qty argument.
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TC-9(3) µC/OS-III returns additional information about the message received. Specifically, the sender specifies the size of the message as a snapshot of the current timestamp is taken and stored as part of the message. The receiver of the message therefore knows when the message was sent.
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TC-9(4) In µC/OS-III, OSQPost() offers a number of options that replaces the two post functions provided in µC/OS-II.
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TC-9(5) µC/OS-III does not provide query services, as they were rarely used in µC/OS-II.