OS_LeaveOS (changes)

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Programmer's OS Reference SWI Manuals Calls

» OS_LeaveOSPart 15 – SWI Calls

OS_LeaveOS

(SWI &7C)

Use

The purpose of this call is to set the processor to User mode.

Notes

Interrupt and Fast Interrupt status is unaltered.

The advantage of this call is that it will cause callbacks to occur which can massively improve applications where only a quick bit of work is required in supervisor mode, yet it may be some time before any callbacks are triggered.

This SWI was introduced with RISC OS 5.00. For older machines, the CallASWI module (version 0.10) provides an implementation of the SWI.
See also OS_EnterOS.

See also

• OS_EnterOS