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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 | 4 |
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...
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| rowspan | 4 |
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| rowspan | 4 |
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(1) |
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| rowspan | 4 |
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...
|
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| rowspan | 4 |
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...
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...
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...
| rowspan | 4 |
|---|
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(2) |
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| rowspan | 5 |
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...
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...
| rowspan | 5 |
|---|
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...
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...
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...
|
...
|
...
| rowspan | 5 |
|---|
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...
| rowspan | 7 |
|---|
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|
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...
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...
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...
...
|
...
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...
|
...
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| rowspan | 7 |
|---|
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...
| rowspan | 8 |
|---|
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...
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| rowspan | 8 |
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(3) |
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| rowspan | 12 |
|---|
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...
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...
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| rowspan | 12 |
|---|
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| rowspan | 4 |
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(4) |
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| rowspan | 5 |
|---|
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|
...
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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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(4) |
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| rowspan | 4 |
|---|
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|
...
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...
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|
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| rowspan | 4 |
|---|
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| rowspan | 4 |
|---|
...
(5) |
...
Table C-12 Message Queue Management API
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TC-12(1) In µC/OS-III, there is no “accept” API as this feature is built into the OSQPend() by specifying the OS_OPT_PEND_NON_BLOCKING option.
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TC-12(2) In µC/OS-II, OSQCreate() returns the address of an OS_EVENT, which is used as the “handle” to the message queue. In µC/OS-III, the application must allocate storage for an OS_Q object, which serves the same purpose as the OS_EVENT. The benefit in µC/OS-III is that it is not necessary to predetermine at compile time, the number of message queues.
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TC-12(3) µC/OS-III returns additional information when a message queue is posted. Specifically, the sender includes the size of the message and takes a snapshot of the current timestamp and stores it in the message. The receiver of the message therefore knows when the message was posted.
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TC-12(4) In µC/OS-III, OSQPost() offers a number of options that replaces the three post functions provided in µC/OS-II.
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TC-12(5) µC/OS-III does not provide query services as they were rarely used.