OS_UpCall 9 (changes)
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OS SWI Calls
» OS_UpCall
» OS_UpCall 9
OS_UpCall 9
(SWI &33)
| Entry | |
|---|---|
| R0 | 9 |
| R1 | Buffer handle |
| R2 | -1 |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
| R2 | Preserved |
Use
The purpose of this call is to call inform your application that a buffer’s free space has become greater than or equal to its specified threshold.
Notes
The Buffer Manager issues this call when data is removed from the specified buffer, and the free space becomes greater than or equal to its current threshold.
This call is never issued under RISC OS 2.
See also
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