DevHlp_AcquireSpinLock

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