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