Writing Interrupts (ISRs) That Call Mouse Functions (46462)
The information in this article applies to:
- Microsoft Mouse driver for MS-DOS 6.x
- Microsoft Mouse driver for MS-DOS 7.x
- Microsoft Mouse driver for MS-DOS 8.x
- Microsoft Mouse driver for MS-DOS 9.0
This article was previously published under Q46462 SUMMARY
The mouse driver protects itself from reentrancy from other mouse
function calls but not from interrupt service routines (ISRs) with
higher priority.
It is recommended that you do not write an ISR with a higher priority
than the mouse hardware interrupt (for example, for the timer
interrupt) that calls mouse functions. The result may be undesirable
and erroneous. If your ISR is performing a mouse function call, your
interrupt may occur during the execution of the mouse function call
and start running your ISR again, that is, the original mouse function
call may never be finished.
The appropriate routine is to use the mouse function 12/20 to set the
mouse user-defined subroutine.
| Modification Type: | Major | Last Reviewed: | 9/23/2003 |
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| Keywords: | KB46462 |
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