DevHlp AcquireSpinLock: Difference between revisions
Created page with "{{DISPLAYTITLE:DevHlp_AcquireSpinLock}} Acquire a subsystem spinlock. This function obtains ownership of a subsystem spinlock. ==Parameters== Spinlock handle. ==Return code== Exit ==Example Code== ;Assembly language ; dh_AcquireSpinLock - Acquire a subsystem spinlock ; ; Obtains ownership of a subsystem spinlock. Used by device drivers. ; ; ENTRY: AX:BX = spinlock handle ; ; EXIT: None ; ; USES..." |
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This function obtains ownership of a subsystem spinlock. | This function obtains ownership of a subsystem spinlock. | ||
==Syntax== | |||
DevHlp_AcquireSpinLock(spl) | |||
==Parameters== | ==Parameters== | ||
Spinlock handle. | ;spl (HSpinLock) - input: Spinlock handle. | ||
==Return code== | ==Return code== | ||
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MOV AX,hSpinLockHighWord ; high word of handle | MOV AX,hSpinLockHighWord ; high word of handle | ||
MOV BX,hSpinLockLowWord ; low word of handle | MOV BX,hSpinLockLowWord ; low word of handle | ||
MOV DL,DevHlp_AcquireSpinLock ; | MOV DL,DevHlp_AcquireSpinLock ; 71h | ||
CALL DevHlp | CALL DevHlp | ||
JC Error | JC Error | ||
Latest revision as of 04:10, 28 May 2025
Acquire a subsystem spinlock.
This function obtains ownership of a subsystem spinlock.
Syntax
DevHlp_AcquireSpinLock(spl)
Parameters
- spl (HSpinLock) - input
- Spinlock handle.
Return code
Exit
Example Code
- Assembly language
; dh_AcquireSpinLock - Acquire a subsystem spinlock ;
; Obtains ownership of a subsystem spinlock. Used by device drivers.
;
; ENTRY: AX:BX = spinlock handle
;
; EXIT: None
;
; USES: Flags
;
hSpinLock dd ? ; 16:16
MOV AX,hSpinLockHighWord ; high word of handle
MOV BX,hSpinLockLowWord ; low word of handle
MOV DL,DevHlp_AcquireSpinLock ; 71h
CALL DevHlp
JC Error