158 lines
2.7 KiB
C
158 lines
2.7 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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resource.c
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Abstract:
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Generic resource management routines for the Cluster Network driver.
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Author:
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Mike Massa (mikemas) February 12, 1997
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Revision History:
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Who When What
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-------- -------- ----------------------------------------------
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mikemas 02-12-97 created
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Notes:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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PCN_RESOURCE
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CnAllocateResource(
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IN PCN_RESOURCE_POOL Pool
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)
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/*++
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Routine Description:
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Allocates a resource from a resource pool.
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Arguments:
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Pool - A pointer to the pool from which to allocate a resource.
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Return Value:
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A pointer to the allocated resource if successful.
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NULL if unsuccessful.
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--*/
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{
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PCN_RESOURCE resource;
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PSINGLE_LIST_ENTRY entry = ExInterlockedPopEntrySList(
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&(Pool->ResourceList),
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&(Pool->ResourceListLock)
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);
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if (entry != NULL) {
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resource = CONTAINING_RECORD(entry, CN_RESOURCE, Linkage);
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}
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else {
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resource = (*(Pool->CreateRoutine))(Pool->CreateContext);
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if (resource != NULL) {
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CN_INIT_SIGNATURE(resource, CN_RESOURCE_SIG);
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resource->Pool = Pool;
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}
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}
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return(resource);
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} // CnAllocateResource
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VOID
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CnFreeResource(
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PCN_RESOURCE Resource
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)
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/*++
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Routine Description:
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Frees a resource back to a resource pool.
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Arguments:
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Resource - A pointer to the resource to free.
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Return Value:
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None.
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--*/
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{
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PCN_RESOURCE_POOL pool = Resource->Pool;
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if (ExQueryDepthSList(&(pool->ResourceList)) < pool->Depth) {
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ExInterlockedPushEntrySList(
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&(pool->ResourceList),
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&(Resource->Linkage),
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&(pool->ResourceListLock)
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);
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}
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else {
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(*(pool->DeleteRoutine))(Resource);
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}
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return;
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} // CnpFreeResource
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VOID
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CnDrainResourcePool(
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PCN_RESOURCE_POOL Pool
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)
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/*++
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Routine Description:
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Frees all cached resources in a resource pool in preparation for the
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pool to be destroyed. This routine does not free the memory containing
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the pool.
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Arguments:
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Pool - A pointer to the pool to drain.
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Return Value:
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None.
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--*/
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{
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PSINGLE_LIST_ENTRY entry;
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PCN_RESOURCE resource;
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while ( (entry = ExInterlockedPopEntrySList(
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&(Pool->ResourceList),
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&(Pool->ResourceListLock)
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)
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) != NULL
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)
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{
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resource = CONTAINING_RECORD(entry, CN_RESOURCE, Linkage);
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(*(Pool->DeleteRoutine))(resource);
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}
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return;
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} // CnDrainResourcePool
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