DevHelp ResetTimer: Difference between revisions
Created page with "This service removes a timer handler for the physical device driver. ==Syntax== ===C=== USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler ); ===Assembler=== <PRE> MOV ..." |
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This service removes a timer handler for the physical device driver. | {{DISPLAYTITLE:DevHelp_ResetTimer}} | ||
This service removes a timer handler for the physical device driver. | |||
==Syntax== | ==Syntax== | ||
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==Parameters== | ==Parameters== | ||
===C=== | ===C=== | ||
; TimerHandler (NPFN) | ;TimerHandler (NPFN): Offset to timer handler | ||
===Assembler=== | ===Assembler=== | ||
MOV AX,Offset cs:timer_handler ; Offset to timer handler | MOV AX,Offset cs:timer_handler ; Offset to timer handler | ||
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Possible errors: Invalid handler if carry flag is set. | Possible errors: Invalid handler if carry flag is set. | ||
===Assembler=== | ===Assembler=== | ||
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ResetTimer removes a timer handler from the list of timer handlers. Timer handlers are analogous to the user timer interrupt (INT 1Ch). Refer to TickCount for a discussion of timer handlers. | ResetTimer removes a timer handler from the list of timer handlers. Timer handlers are analogous to the user timer interrupt (INT 1Ch). Refer to TickCount for a discussion of timer handlers. | ||
DS should be set to the data segment of the physical device driver. If the physical device driver issued a call to PhysToVirt referencing the DS register, the physical device driver will restore DS to the original value. | DS should be set to the data segment of the physical device driver. If the physical device driver issued a call to PhysToVirt referencing the DS register, the physical device driver will restore DS to the original value. | ||
==Example Code== | ==Example Code== | ||
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USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler ); | USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler ); | ||
</PRE> | </PRE> | ||
[[Category:DevHlps]] | [[Category:DevHlps]] | ||
Latest revision as of 14:26, 2 January 2020
This service removes a timer handler for the physical device driver.
Syntax
C
USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler );
Assembler
MOV AX,Offset cs:timer_handler ; Offset to timer handler MOV DL,DevHlp_ResetTimer CALL [Device_Help]
Parameters
C
- TimerHandler (NPFN)
- Offset to timer handler
Assembler
MOV AX,Offset cs:timer_handler ; Offset to timer handler
Return Code
Success Indicator: Clear if successful.
Possible errors: Invalid handler if carry flag is set.
Assembler
'C' Clear if successful.
'C' Set if error.
AX = Error code.
Possible errors:
Invalid handler if carry flag is set.
Remarks
ResetTimer removes a timer handler from the list of timer handlers. Timer handlers are analogous to the user timer interrupt (INT 1Ch). Refer to TickCount for a discussion of timer handlers.
DS should be set to the data segment of the physical device driver. If the physical device driver issued a call to PhysToVirt referencing the DS register, the physical device driver will restore DS to the original value.
Example Code
C
#include "dhcalls.h" USHORT APIENTRY DevHelp_ResetTimer( NPFN TimerHandler );