SwCallbackInfoRec

Offset Size Contents

+0       4  pfrNext      address of next SwCallbackInfoRec in the

notification chain (or 0000:0000 if last entry)

+4       4  pfHandler    addr of notification-function handler

+8       4  res          (reserved)

+0c       4  pfarAPIs     address of list of SwApiInfoRec structures.

16               size of an SwCallbackInfoRec structure

pfrNext  this is the address of the next SwCallbackInfoRec in the

chain; it is stored by programs which intercept INT 2fH 4b01H

(build notification chain).

pfHandler  the FAR address of the code that will be called for various

notification functions.

pfarAPIs  the FAR address of the first of a series of SwApiInfoRec

structures that identify how much support this program

provides for various asynchronous request APIs.  The list ends

when the first field of that structure is 0000H.

This structure is used in SwSrvcFn 0004H (hook notification chain) and in

INT 2fH 4b01H (build notification chain).  It is part of the system that

allows programs to be notified when they are about to be switched out or

that they can resume operation, etc.

See Also: Switcher Services and Notifications

INT 2fH 4bxxH (switcher functions)

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