92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
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/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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fdoext.c
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Abstract
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Author:
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Ervin P.
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Environment:
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Kernel mode only
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Revision History:
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--*/
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#include "pch.h"
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FDO_EXTENSION *allFdoExtensions = NULL;
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KSPIN_LOCK allFdoExtensionsSpinLock;
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/*
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********************************************************************************
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* EnqueueFdoExt
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********************************************************************************
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*
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* Note: this function cannot be pageable because it
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* acquires a spinlock.
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*/
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VOID EnqueueFdoExt(FDO_EXTENSION *fdoExt)
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{
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KIRQL oldIrql;
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static BOOLEAN firstCall = TRUE;
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if (firstCall){
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KeInitializeSpinLock(&allFdoExtensionsSpinLock);
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firstCall = FALSE;
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}
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KeAcquireSpinLock(&allFdoExtensionsSpinLock, &oldIrql);
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ASSERT(!fdoExt->nextFdoExt);
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fdoExt->nextFdoExt = allFdoExtensions;
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allFdoExtensions = fdoExt;
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KeReleaseSpinLock(&allFdoExtensionsSpinLock, oldIrql);
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}
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/*
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********************************************************************************
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* DequeueFdoExt
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********************************************************************************
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*
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* Note: this function cannot be pageable because it
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* acquires a spinlock.
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*
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*/
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VOID DequeueFdoExt(FDO_EXTENSION *fdoExt)
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{
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FDO_EXTENSION *thisFdoExt;
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KIRQL oldIrql;
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KeAcquireSpinLock(&allFdoExtensionsSpinLock, &oldIrql);
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if (fdoExt == allFdoExtensions){
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allFdoExtensions = fdoExt->nextFdoExt;
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}
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else {
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for (thisFdoExt = allFdoExtensions; thisFdoExt; thisFdoExt = thisFdoExt->nextFdoExt){
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if (thisFdoExt->nextFdoExt == fdoExt){
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thisFdoExt->nextFdoExt = fdoExt->nextFdoExt;
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break;
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}
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}
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}
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fdoExt->nextFdoExt = NULL;
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KeReleaseSpinLock(&allFdoExtensionsSpinLock, oldIrql);
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}
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