132 lines
2.6 KiB
C
132 lines
2.6 KiB
C
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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Abstract:
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File contains the following functions
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ActionCache
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CacheToA
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Revision History:
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Amritansh Raghav 6/8/95 Created
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--*/
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//
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// Include files
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//
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#include "allinc.h"
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DWORD
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UpdateCache(
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DWORD dwCache,
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BOOL *fUpdate
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)
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/*++
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Routine Description
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Function used to update a cache. It checks to see if the last time
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the cache was updated is greater than the time out (A value of 0
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for the last time of update means the cache is invalid), calls the
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function that loads the cache and then sets the last update time
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Locks
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Arguments
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dwCache This is one of the Cache Ids defined in rtrmgr/defs.h. It
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is used to index into the table of locks protecting the caches,
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the table of function pointers that holds a pointer to a
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function that loads the cache andthe table of last update times
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fUpdate Is Set to true if the cache is updated
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Return Value
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None
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--*/
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{
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DWORD dwResult = NO_ERROR;
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LONG dwNeed;
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LONG dwSpace;
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//
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// BUG put in a bounds check here otherwise effects can be disastrous
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//
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// Trace1(MIB,"Trying to update %s cache", CacheToA(dwCache));
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__try
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{
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ENTER_READER(dwCache);
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if((g_LastUpdateTable[dwCache] isnot 0) and
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((GetCurrentTime() - g_LastUpdateTable[dwCache]) < g_TimeoutTable[dwCache]))
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{
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*fUpdate = FALSE;
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dwResult = NO_ERROR;
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__leave;
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}
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READER_TO_WRITER(dwCache);
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// Trace0(MIB,"Cache out of date");
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dwResult = (*g_LoadFunctionTable[dwCache])();
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if(dwResult isnot NO_ERROR)
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{
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Trace2(ERR,"Error %d loading %s cache",
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dwResult,
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CacheToA(dwCache));
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g_LastUpdateTable[dwCache] = 0;
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__leave;
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}
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g_LastUpdateTable[dwCache] = GetCurrentTime();
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dwResult = NO_ERROR;
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}
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__finally
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{
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EXIT_LOCK(dwCache);
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}
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return dwResult; //to keep compiler happy
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}
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PSZ
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CacheToA(
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DWORD dwCache
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)
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{
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static PSZ cacheName[] = {"Ip Address Table",
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"Ip Forward Table",
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"Ip Net To Media table",
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"Tcp Table",
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"Udp Table",
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"Arp Entity Table",
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"Illegal Cache Number - ABORT!!!!"};
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return( (dwCache >= NUM_CACHE - 1)?
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cacheName[NUM_CACHE-1] : cacheName[dwCache]);
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}
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