Function 0901 - Get and Enable Virtual Interrupt State


7.2.35. Function 0900 - Get and Disable Virtual Interrupt State	Table of Contents	7.2.37. Function 0902 - Get Virtual Interrupt State

- 7.2.36. - Table of Contents

7. PMODE/W MSDOS Extender

7.2. PMODE/W Supported DPMI INT 31h functions

7.2.36. Function 0901 - Get and Enable Virtual Interrupt State

PMODE/W API

This function Enables the virtual interrupt flag and returns the previous state of it.

In:
   AX     = 0901h
Out:
   always successful:
     carry flag clear
     AL     = 0 if virtual interrupts were previously
                disabled
     AL     = 1 if virtual interrupts were previously
                enabled

Notes:
AH is not changed by this function. Therefore the previous state can be restored by simply executing another INT 31h.

A client that does not need to know the prior interrupt state can execute the STI instruction rather than calling this function. The instruction may be trapped by a DPMI host and should be assumed to be very slow.


7.2.35. Function 0900 - Get and Disable Virtual Interrupt State	Table of Contents	7.2.37. Function 0902 - Get Virtual Interrupt State

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