From: Rob Green [robg@cdp.com]
Sent: Friday, March 02, 2001 7:48 PM
To: NT Developers Interest List
Subject: [ntdev] RE: How to initialize a KWAIT_BLOCK array

NTSTATUS Status;
PKWAIT_BLOCK WaitBlock;
PVOID        *ObjectTable;
KSEMAPHORE aSemaphore;
KEVENT aEvent;
ULONG Count=2;

KeInitializeSemaphore(&aSemaphore,0,MAXLONG);
KeInitializeEvent (&aEvent,SynchronizationEvent,FALSE);

WaitBlock = ExAllocatePool( NonPagedPool,
MAXIMUM_WAIT_OBJECTS*sizeof(KWAIT_BLOCK));
if ( WaitBlock ) {
    RtlZeroMemory( WaitBlock, MAXIMUM_WAIT_OBJECTS*sizeof(KWAIT_BLOCK));
    ObjectTable = ExAllocatePool( NonPagedPool,
MAXIMUM_WAIT_OBJECTS*sizeof(PVOID));
    if ( ObjectTable ) {
        RtlZeroMemory( ObjectTable, MAXIMUM_WAIT_OBJECTS*sizeof(PVOID));

        ObjectTable[0] = &aSemaphore;
        ObjectTable[1] = &aEvent;

        // we will wait in kernel mode since the objects are on the stack
        ASSERT(Count<MAXIMUM_WAIT_OBJECTS);
        Status = KeWaitForMultipleObjects(
            Count, //IN ULONG Count,
            ObjectTable, //IN PVOID Object[],
            WaitAny, //IN WAIT_TYPE WaitType,
            Executive,	//IN KWAIT_REASON WaitReason,
            (KPROCESSOR_MODE)KernelMode, //IN KPROCESSOR_MODE WaitMode,
            FALSE,	//IN BOOLEAN Alertable,
            NULL, //IN PLARGE_INTEGER Timeout OPTIONAL,
            WaitBlock //IN PKWAIT_BLOCK WaitBlockArray OPTIONAL
        );
        ExFreePool(ObjectTable);
    }
    ExFreePool(WaitBlock);
}


rob

> -----Original Message-----
> From: bounce-ntdev-137@lists.osr.com
> [mailto:bounce-ntdev-137@lists.osr.com]On Behalf Of
> jsylvia@pinnaclesys.com
> Sent: Friday, March 02, 2001 3:46 PM
> To: NT Developers Interest List
> Subject: [ntdev] How to initialize a KWAIT_BLOCK array
>
>
> I need to use KeWaitForMultipleObjects to wait on more than
> THREAD_WAIT_OBJECTS (i.e. 3). Can someone explain how to setup and use
> WAIT_BLOCKs in the call?
>
> Thanks
> Jeff
>
> ---
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