74 lines
1.3 KiB
C
74 lines
1.3 KiB
C
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/*++
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Copyright (C) Microsoft Corporation, 1991 - 1999
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Module Name:
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clntirp.c
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Abstract:
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Client IRP queuing routines for CLASSPNP
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Environment:
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kernel mode only
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Notes:
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Revision History:
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--*/
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#include "classp.h"
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#include "debug.h"
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/*
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* EnqueueDeferredClientIrp
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*
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* Note: we currently do not support Cancel for storage irps.
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*/
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VOID EnqueueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData, PIRP Irp)
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{
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KIRQL oldIrql;
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KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
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InsertTailList(&FdoData->DeferredClientIrpList, &Irp->Tail.Overlay.ListEntry);
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KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
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}
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/*
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* DequeueDeferredClientIrp
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*
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*/
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PIRP DequeueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData)
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{
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KIRQL oldIrql;
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PLIST_ENTRY listEntry;
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PIRP irp;
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KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
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if (IsListEmpty(&FdoData->DeferredClientIrpList)){
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listEntry = NULL;
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}
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else {
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listEntry = RemoveHeadList(&FdoData->DeferredClientIrpList);
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}
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KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
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if (listEntry == NULL) {
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irp = NULL;
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} else {
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irp = CONTAINING_RECORD(listEntry, IRP, Tail.Overlay.ListEntry);
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ASSERT(irp->Type == IO_TYPE_IRP);
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InitializeListHead(&irp->Tail.Overlay.ListEntry);
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}
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return irp;
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}
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