FilePageMgrLru.mesa
Copyright © 1985 by Xerox Corporation. All rights reserved.
Last edited by:
Kolling on January 24, 1984 12:58:35 pm PST
Hauser, March 7, 1985 5:18:42 pm PST
DIRECTORY
AlpineEnvironment
USING[PageNumber],
FileMap
USING[Handle],
FilePageMgrPrivateChunk
USING[Chunk, ChunkType, ListChunkType, RefChunk],
FilePageMgrPrivateFile
USING[FPMFileHandle];
FilePageMgrLru: CEDAR DEFINITIONS =
BEGIN
See FilePageMgrPrivateFile for implementation details. Things of especial note are: Mapping and unmapping do not go on while a chunk is on an lru list; therefore, the lru procedures can read Chunk.fileHandle and Chunk.startFilePageNumber. The FPMFileObject monitor must not be entered by a process holding the FilePageMgrLruImpl monitor.
PutMappedChunkOnLruList: PROCEDURE[refChunk: FilePageMgrPrivateChunk.RefChunk,
lruListPlace: LruListPlace];
non system-fatal errors: none.
LruListPlace: TYPE = {mru, lru};
PutUnmappedChunkOnLruList: PROCEDURE[refChunk: FilePageMgrPrivateChunk.RefChunk];
non system-fatal errors: none.
GetOurChunkFromLruList: PROCEDURE [refChunk: FilePageMgrPrivateChunk.RefChunk,
tellSweeperToHurry: BOOLEAN];
non system-fatal errors: none.
GetOtherChunkFromLruList: PROCEDURE [chunkType:
FilePageMgrPrivateChunk.ListChunkType] RETURNS[mapped: BOOLEAN, refChunk:
FilePageMgrPrivateChunk.RefChunk, fileHandle: FileMap.Handle, startFilePageNumber:
AlpineEnvironment.PageNumber];
non system-fatal errors: none.
if unmapped, we really got it; if mapped, just returns a hint but has also moved the chunk to the mru end of the list.
RelinkChunkAsLruOnLruList: PROCEDURE[refChunk: FilePageMgrPrivateChunk.RefChunk];
non system-fatal errors: none.
UsingTooMuchOfCache: PROCEDURE[fPMFileHandle: FilePageMgrPrivateFile.FPMFileHandle]
RETURNS [yes: BOOLEAN];
non system-fatal errors: none.
only called for normal type chunks.
WaitToSweep: PROCEDURE [oldNeedToHurry: BOOLEAN, chunkType:
FilePageMgrPrivateChunk.ListChunkType] RETURNS[needToHurry: BOOLEAN,
sweepList: LIST OF SweepItem];
non system-fatal errors: none.
SweepItem: TYPE = RECORD[fileHandle: FileMap.Handle, startFilePageNumber:
AlpineEnvironment.PageNumber];
InitializeLruLists: PROCEDURE[nChunks: ARRAY FilePageMgrPrivateChunk.ListChunkType OF
NAT];
non system-fatal errors: none.
CheckCacheInCleanState: PROCEDURE RETURNS [clean: BOOLEAN];
non system-fatal errors: none.
END.
Edit Log
Initial: Kolling: 23-Feb-82 17:21:13: private defs file for the lru lists manager part of File Page Manager.
Nodified: Hauser: February 20, 1985 3:10:03 pm PST
Hauser, March 7, 1985 3:07:51 pm PST
Added copyright