DOS/32 Advanced DOS Extender
- Programmer's Reference
2.46 - DPMI function 0901h
- Get and Enable Virtual Interrupt State
Enables the virtual interrupt
flag and returns the previous state of the virtual interrupt flag.
In: |
AX = 0901h |
Out: |
CF clear
Virtual interrupts enabled
AL = 0 if virtual interrupts were previously disabled
AL = 1 if virtual interrupts were previously enabled |
Notes:
a) AH is not changed
by this function. Therefore, the previous state can be restored by simply
executing another INT 31h. See DPMI function 0900h.
b) 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 the
host and should be assumed to be very slow.
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