DIRECTORY
BasicTime,
Camelot,
CamelotRecoverable,
CountedVM,
File,
FileStream,
FS,
FSBackdoor,
IO,
Mach,
PBasics,
Process,
RedBlackTree,
Rope,
YggBuffMan,
YggDID,
YggDIDPrivate,
YggDIDMap,
YggDIDMapPrivate,
YggdrasilInit,
YggLock,
YggLog,
YggLogBasic,
YggLogControl,
YggLogRep,
YggFixedNames,
YggEnvironment,
YggFile,
YggFileStream,
YggIndexMaint,
YggInternal,
YggMonitoringLog,
YggSunOS,
YggRep,
YggRestartFile,
YggTransaction,
VM;
MachCamelotEmulationForSunOSImpl: CEDAR MONITOR
IMPORTS BasicTime, CamelotRecoverable, CountedVM, FS, IO, PBasics, Process, RedBlackTree, YggBuffMan, YggLog, YggLogBasic, YggLogControl, YggdrasilInit, YggRestartFile, YggTransaction, VM
EXPORTS Camelot, Mach, CamelotRecoverable, YggdrasilInit, YggMonitoringLog, YggTransaction

= BEGIN 
OPEN Camelot, Mach;
ROPE: TYPE = Rope.ROPE;


notice: PUBLIC YggMonitoringLog.ProcsRecord _ [];

DID: PUBLIC TYPE ~ REF DIDRep;
DIDRep: PUBLIC TYPE ~ YggDIDPrivate.DIDRep;

Document: TYPE = REF DocumentRep;
DocumentRep: PUBLIC TYPE = YggDIDMapPrivate.DocumentRep;

TraceLogWriting: BOOL _ TRUE;
TraceFileStream: IO.STREAM _ NIL;

WordsINWORDS: CARD = WORDS[CARD32];



GoAway: BOOL _ FALSE;

NextTransCount: CARD _ 10001;

CheckPointEphocNumber: CARD _ 1;
MachCall: PUBLIC SIGNAL [errorCode: msgReturnT, explanation: Rope.ROPE] = CODE;
MachAnomaly: PUBLIC SIGNAL [explanation: Rope.ROPE] = CODE; 

taskSelf: PUBLIC PROC RETURNS [targetTask: taskT] ~ {
targetTask _ [1];
};

taskNotify: PUBLIC PROC RETURNS [notifyPort: portT] ~ {
notifyPort _ [2];
};
vmAllocate: PUBLIC PROC [targetTask: vmTaskT, address: vmAddressT, size: vmSizeT, anywhere: BOOL,raiseSignal: BOOL] RETURNS [mappedAddress: vmAddressT _ 0, kernCode: kernReturnT _ -1] ~ TRUSTED {
interval: VM.Interval;
interval _ VM.Allocate[count: VM.PagesForBytes[size]];
mappedAddress _ LOOPHOLE[VM.AddressForPageNumber[interval.page]];
kernCode _ KernSuccess;
};
VMAllocList: LIST OF AllocItem _ NIL;
AllocItem: TYPE = RECORD [
pagingObject: pagingObjectT,
offset: vmOffsetT,
size: vmSizeT,
mappedAddress: vmAddressT,
cvmHandle: CountedVM.Handle,
allocated: BOOL _ TRUE,
dirtied: BOOL _ FALSE,
timeOfLastDirty: BasicTime.GMT _ BasicTime.earliestGMT,
timeOfLastWrite: BasicTime.GMT _ BasicTime.earliestGMT,
dirtiedDuringEphoc: CARD _ 0,
ephocOfLastWrite: CARD _ 0,
ownedByCheckpointProcess: BOOL _ FALSE
];

vmAllocateWithPager: PUBLIC PROC [targetTask: vmTaskT, address: vmAddressT, size: vmSizeT, anywhere: BOOL, pagingObject: pagingObjectT, offset: vmOffsetT, raiseSignal: BOOL] RETURNS [mappedAddress: vmAddressT _ 0, kernCode: kernReturnT _ -1] ~ TRUSTED {
[mappedAddress, kernCode] _ vmAllocateWithPagerInner[size, pagingObject, offset, FALSE];
};
vmAllocateWithPagerInner: ENTRY PROC [size: vmSizeT, pagingObject: pagingObjectT, offset: vmOffsetT, zeroFillOnly: BOOL] RETURNS [mappedAddress: vmAddressT _ 0, kernCode: kernReturnT _ -1] ~ TRUSTED {
loai: LIST OF AllocItem;
cvmHandle: CountedVM.Handle;
pages: INT _ -1;
firstPage: INT _ -1;
FOR loai _ VMAllocList, loai.rest UNTIL loai = NIL DO
IF loai.first.pagingObject # pagingObject THEN LOOP;
IF loai.first.offset > offset+size THEN LOOP;
IF offset > loai.first.offset+loai.first.size THEN LOOP;
IF loai.first.offset = offset AND loai.first.size = size THEN {
IF loai.first.allocated THEN ERROR;
EXIT;
};
ENDLOOP;
IF loai = NIL THEN cvmHandle _ CountedVM.Allocate[words:size/BYTES[WORD]]
 ELSE {
IF loai.first.cvmHandle = NIL THEN cvmHandle _ CountedVM.Allocate[words:size/BYTES[WORD]]
 ELSE cvmHandle _ loai.first.cvmHandle;
};
mappedAddress _ LOOPHOLE[cvmHandle.pointer];
pages _ FS.PagesForBytes[size];
IF INT[size] # FS.BytesForPages[pages] THEN ERROR;
firstPage _ FS.PagesForBytes[offset];
IF INT[offset] # FS.BytesForPages[firstPage] THEN ERROR;
IF loai = NIL THEN {
loai _ VMAllocList _ CONS[[pagingObject: pagingObject, offset: offset, size: size, mappedAddress: mappedAddress, cvmHandle: NIL], VMAllocList];
};
IF zeroFillOnly THEN {
where: LONG POINTER _ LOOPHOLE[mappedAddress];
nWordsLeft: CARD32 _ size/PBasics.bytesPerWord;
WHILE nWordsLeft > 0 DO
fillThisTime: CARD32 _ MIN[nWordsLeft, 10000];
PBasics.Fill[where: where, nWords: fillThisTime, value: 0];
where _ where + fillThisTime * UNITS[PBasics.Word];
nWordsLeft _ nWordsLeft - fillThisTime;
ENDLOOP;
loai.first.allocated _ FALSE;
loai.first.mappedAddress _ mappedAddress;
loai.first.cvmHandle _ cvmHandle;
}
 ELSE {
IF loai.first.cvmHandle = NIL THEN {
FS.Read[file: FileForPagingObject[loai.first.pagingObject], from: firstPage, nPages: pages, to: LOOPHOLE[mappedAddress]];
loai.first.mappedAddress _ mappedAddress;
loai.first.cvmHandle _ cvmHandle;
};
loai.first.allocated _ TRUE;
};
kernCode _ KernSuccess;
};
vmDeallocate: PUBLIC ENTRY PROC [targetTask: vmTaskT, address: vmAddressT, size: vmSizeT, raiseSignal: BOOL] RETURNS [kernCode: kernReturnT _ -1] ~ {
FOR loai: LIST OF AllocItem _ VMAllocList, loai.rest UNTIL loai = NIL DO
IF loai.first.mappedAddress = address THEN {
pages: INT _ -1;
firstPage: INT _ -1;
IF size # loai.first.size THEN ERROR;
WHILE loai.first.ownedByCheckpointProcess DO Process.Pause[1] ENDLOOP;
pages _ FS.PagesForBytes[loai.first.size];
firstPage _ FS.PagesForBytes[loai.first.offset];
FS.Write[file: FileForPagingObject[loai.first.pagingObject], to: firstPage, nPages: pages, from: LOOPHOLE[address]];
loai.first.dirtied _ FALSE;
loai.first.allocated _ FALSE;
loai.first.mappedAddress _ 0;
loai.first.cvmHandle _ NIL;
EXIT;
};
ENDLOOP;
};

noteDirtyOfMemory: ENTRY PROC [optr: optrT, size: uInt] ~ {
po: pagingObjectT;
po _ PagingObjectForSegementId[optr.segmentId];
FOR loai: LIST OF AllocItem _ VMAllocList, loai.rest UNTIL loai = NIL DO
IF loai.first.pagingObject = po AND (loai.first.offset > optr.lowOffset + size) AND (loai.first.offset + loai.first.size < optr.lowOffset) THEN {
}
 ELSE {
loai.first.dirtied _ TRUE;
loai.first.timeOfLastDirty _ BasicTime.Now[];
loai.first.dirtiedDuringEphoc _ CheckPointEphocNumber;
EXIT;
};
REPEAT FINISHED => ERROR;
ENDLOOP;
};
msgSend: PUBLIC PROC [header: REF msgHeaderT, option: msgOptionT, timeout: INT, raiseSignal: BOOL] RETURNS [msgCode: msgReturnT _ -1] ~ {
ERROR;
};
msgReceive: PUBLIC PROC [header: REF msgHeaderT, option: msgOptionT, timeout: INT, raiseSignal: BOOL] RETURNS [msgCode: msgReturnT _ -1] ~ {
DO
Process.Pause[33];
IF GoAway THEN RETURN[Mach.RcvTimedOut];
ENDLOOP;
};
nameServerPort: PUBLIC PROC RETURNS [p: portT] ~ {
p _ [3];
};
MachPortsLookup: PUBLIC PROC [targetTask: taskT, raiseSignal: BOOL] RETURNS [intPortSet: portArrayT, intPortArrayCount: INT, kernCode: kernReturnT] ~ {
xPortArray: REF ARRAY[0..3] OF portT _ NEW[ARRAY[0..3] OF portT _ [[0], [1], [2], [3]]];
intPortArrayCount _ 4;
kernCode _ KernSuccess;
intPortSet _ LOOPHOLE[xPortArray];
};
nextPort: portT _ [10];
portAllocate: PUBLIC PROC [targetTask: taskT, raiseSignal: BOOL] RETURNS [newPort: portT, kernCode: kernReturnT _ -1] ~ TRUSTED {
nextPort _ [nextPort + 1];
newPort _ nextPort;
kernCode _ KernSuccess;

};
portRestrict: PUBLIC PROC [targetTask: taskT, port: portT, raiseSignal: BOOL] RETURNS [kernCode: kernReturnT _ -1] ~ {
kernCode _ KernSuccess;
};
portUnrestrict: PUBLIC PROC [targetTask: taskT, port: portT, raiseSignal: BOOL] RETURNS [kernCode: kernReturnT _ -1] ~ {
kernCode _ KernSuccess;
};

netnameCheckIn: PUBLIC PROC [ServPort: portT, portName: Rope.ROPE, signature: portT, portId: portT, raiseSignal: BOOL] RETURNS [kernCode: kernReturnT] ~ {
kernCode _ KernSuccess;
};
DSInitialize: PUBLIC PROC [dsPort: portT, raiseSignal: BOOL] RETURNS [serverID: serverIdT, tsPort, mPort, sPort: portT, sharedMemAddr: vmAddressT, seqDescList: ListOfSegmentDesc _ NIL, seqPortList: ListOfPorts, kernCode: Mach.kernReturnT _ -1] ~ TRUSTED {
serverID _ [1989];
tsPort _ [4];
mPort _ [5];
sPort _ [6];
sharedMemAddr _ 0;
seqDescList _ LIST[[serverId: [1234], segmentId: [1066], logicalDisk: 'Z, unused: 'z, highSize: 0, lowSize: RecoverableMemoryPagingSize]];
seqPortList _ LIST[RecoverableMemoryPagingObject];
SegmentIdPagingObjectMap _ LIST[
[[1066], RecoverableMemoryPagingObject, CamelotRecoverable.CamelotRecoverableFile],
[YggSunOS.LogSegmentID, LogPagingObject, CamelotRecoverable.CamelotLogFile],
[[1492], [9], CamelotRecoverable.RestartFile]];
kernCode _ KernSuccess;
};
CamelotRecoverableInit: PUBLIC PROC RETURNS [seqDescList: Camelot.ListOfSegmentDesc, seqPortList: Mach.ListOfPorts] ~ {
seqDescList _ LIST[[serverId: [1234], segmentId: YggSunOS.LogSegmentID, logicalDisk: 'K, unused: 'k, highSize: 0, lowSize: YggSunOS.LogFileSize * YggSunOS.LogBytesPerPage], [serverId: [1234], segmentId: [1492], logicalDisk: 'R, unused: 'r, highSize: 0, lowSize: 4096]];
seqPortList _ LIST[LogPagingObject, [9]];
};

RecoverableMemoryPagingObject: pagingObjectT _ [7];
RecoverableMemoryPagingSize: CARD32 _ 40960000;
LogPagingObject: pagingObjectT _ [8];
SegmentIdPagingObjectMap: LIST OF SegmentIdPagingObjectMapItem;
SegmentIdPagingObjectMapItem: TYPE = RECORD[
segmentId: segmentIdT,
pagingObject: pagingObjectT,
backingFile: FS.OpenFile
];

PagingObjectForSegementId: PROC [segmentId: segmentIdT] RETURNS [pagingObject: pagingObjectT] ~ {
FOR lospom: LIST OF SegmentIdPagingObjectMapItem _ SegmentIdPagingObjectMap, lospom.rest UNTIL lospom = NIL DO
IF lospom.first.segmentId = segmentId THEN RETURN[lospom.first.pagingObject];
REPEAT FINISHED => ERROR
ENDLOOP;
};

SegementIdForPagingObject: PROC [pagingObject: pagingObjectT] RETURNS [segmentId: segmentIdT] ~ {
FOR lospom: LIST OF SegmentIdPagingObjectMapItem _ SegmentIdPagingObjectMap, lospom.rest UNTIL lospom = NIL DO
IF lospom.first.pagingObject = pagingObject THEN RETURN[lospom.first.segmentId];
REPEAT FINISHED => ERROR
ENDLOOP;
};
FileForPagingObject: PROC [pagingObject: pagingObjectT] RETURNS [backingFile: FS.OpenFile] ~ {
FOR lospom: LIST OF SegmentIdPagingObjectMapItem _ SegmentIdPagingObjectMap, lospom.rest UNTIL lospom = NIL DO
IF lospom.first.pagingObject = pagingObject THEN RETURN[lospom.first.backingFile];
REPEAT FINISHED => ERROR
ENDLOOP;
};

DSPinObject: PUBLIC PROC [dsPort: portT, tid: tidT, optr: optrT, size: uInt, raiseSignal: BOOL] RETURNS [kernCode: Mach.kernReturnT _ -1] ~ {
effectiveOptr: optrT _ optr;
effectiveSize: uInt _ size;
IF BYTES[UNIT] = 2 THEN {
effectiveOptr.lowOffset _ PBasics.BITAND[optr.lowOffset, 0FFFFFFFEH];
effectiveSize _ PBasics.BITAND[optr.lowOffset - effectiveOptr.lowOffset + size + 1, 0FFFFFFFEH];
};
rememberPin[tid, effectiveOptr, effectiveSize];
noteDirtyOfMemory[effectiveOptr, effectiveSize];
kernCode _ KernSuccess;
};
OpenTraceFileAndStream: PROC ~ {
TraceFileStream _ FS.StreamOpen[fileName: "///Trace/LogTrace.txt", accessOptions: $create, keep: 8,  createByteCount: 25600];
};

DSLogNewValue: PUBLIC PROC [dsPort: portT, tid: tidT, optr: optrT, newValue: pointerT, newValueCnt: INT, raiseSignal: BOOL] RETURNS [kernCode: Mach.kernReturnT _ -1] ~ {
thisRecord: YggLog.RecordID;
[thisRecord: thisRecord] _ YggLog.Write[trans: tid, logRecordPhaseType: redo,
recordType: writeBytes, optr: optr, recordData: [base: LOOPHOLE[newValue], length: (newValueCnt+3)/4, rest: NIL], force: FALSE];
IF TraceLogWriting AND TraceFileStream = NIL THEN OpenTraceFileAndStream[];
IF TraceLogWriting THEN {
p: ENTRY PROC ~ {
IO.PutF[TraceFileStream, "New value at %g for seg: %g, offset: %b, byteSize: %g(%b)\n", IO.card[thisRecord.low], IO.card[optr.segmentId.value], IO.card[optr.lowOffset], IO.card[newValueCnt], IO.card[newValueCnt]];
IO.Flush[TraceFileStream];
};
p[];
};
monitoredChangePin[transID: tid, loggingNow: TRUE, forceClear: FALSE, optr: optr, size: newValueCnt];
kernCode _ KernSuccess;
};
NumberOfShortLogRecords: INT _ 0;

DSLogOldValueNewValue: PUBLIC PROC [dsPort: portT, tid: tidT, optr: optrT, oldValue: pointerT, oldValueCnt: INT, newValue: pointerT, newValueCnt: INT, raiseSignal: BOOL] RETURNS [kernCode: Mach.kernReturnT _ -1] ~ {
thisRecord: YggLog.RecordID;
IF newValueCnt <= 2 THEN {
NumberOfShortLogRecords _ NumberOfShortLogRecords + 1;
};
[thisRecord: thisRecord] _ YggLog.Write[trans: tid, logRecordPhaseType: redo,
recordType: writeBytes, optr: optr, recordData: [base: LOOPHOLE[newValue], length: (newValueCnt+3)/4, rest: NIL], force: FALSE];
IF TraceLogWriting AND TraceFileStream = NIL THEN OpenTraceFileAndStream[];
IF TraceLogWriting THEN {
p: ENTRY PROC ~ {
IO.PutF[TraceFileStream, "Old/new at %b for seg: %g, offset: %b, byteSize: %g(%b)\n", IO.card[thisRecord.low], IO.card[optr.segmentId.value], IO.card[optr.lowOffset], IO.card[newValueCnt], IO.card[newValueCnt]];
IO.Flush[TraceFileStream];
};
p[];
};
monitoredChangePin[transID: tid, loggingNow: TRUE, forceClear: FALSE, optr: optr, size: oldValueCnt];
kernCode _ KernSuccess;
};
DSQInit: PUBLIC PROC [sharedMemAddr: Mach.vmAddressT] ~ {
};
DSQPreflush: PUBLIC PROC [dsPort: Mach.portT, optr: optrT, sizeInBytes: uInt] ~ {
po: pagingObjectT;
po _ PagingObjectForSegementId[optr.segmentId];
FOR loai: LIST OF AllocItem _ VMAllocList, loai.rest UNTIL loai = NIL DO
IF loai.first.pagingObject = po AND loai.first.offset = optr.lowOffset THEN {
backingFile: FS.OpenFile;
pages: INT _ -1;
firstPage: INT _ -1;
IF sizeInBytes # loai.first.size THEN ERROR;
IF loai.first.cvmHandle = NIL THEN ERROR;
pages _ FS.PagesForBytes[loai.first.size];
firstPage _ FS.PagesForBytes[loai.first.offset];
backingFile _ FileForPagingObject[loai.first.pagingObject];
FS.Write[file: backingFile, to: firstPage, nPages: pages, from: LOOPHOLE[loai.first.mappedAddress]];
loai.first.dirtied _ FALSE;
EXIT;
};
REPEAT FINISHED => ERROR;
ENDLOOP;
};
DSQZeroFill: PUBLIC PROC [dsPort: Mach.portT, optr: optrT, sizeInBytes: uInt] ~ {
po: pagingObjectT;
po _ PagingObjectForSegementId[optr.segmentId];
[] _ vmAllocateWithPagerInner[sizeInBytes, po, optr.lowOffset, TRUE];
};
TAAddApplication: PUBLIC PROC [tPort: portT, atPort: portT, authName: Rope.ROPE, raiseSignal: BOOL] RETURNS [applicationID: applicationIdT, taPort: portT, kernCode: Mach.kernReturnT _ -1] ~ TRUSTED {
kernCode _ KernSuccess;
};
TABegin: PUBLIC PROC [taPort: portT, parentTid: tidT, transType: transactionTypeT, raiseSignal: BOOL] RETURNS [newTid: tidT, kernCode: Mach.kernReturnT _ -1] ~ TRUSTED {
newTid _ GetNextTrans[];
IF ~noteNewTrans[newTid] THEN ERROR;
kernCode _ KernSuccess;
};
TAEnd: PUBLIC PROC [taPort: portT, tid: tidT, protocolType: protocolTypeT, raiseSignal: BOOL] RETURNS [timestamp: timestampT, status: INT, kernCode: Mach.kernReturnT _ -1] ~ TRUSTED {
thisRecord: YggLog.RecordID;
transID: YggTransaction.TransID _ LOOPHOLE[tid];
block: LIST OF YggLog.Block;
blockArrayOfWords: LONG POINTER TO ARRAY[0..1024/4) OF CARD32;
block _ getScratchBlock[];
block.first.length _ 2;
blockArrayOfWords _ LOOPHOLE[block.first.base];
blockArrayOfWords[0] _ tid.top.highTicker;
blockArrayOfWords[1] _ tid.top.lowTicker;
[thisRecord: thisRecord] _ YggLog.Write[trans: tid, logRecordPhaseType: analysis,
recordType: commitTrans, optr: [[0],0,0], recordData: block.first, force: TRUE];
returnScratchBlock[block];
IF TraceLogWriting AND TraceFileStream = NIL THEN OpenTraceFileAndStream[];
IF TraceLogWriting THEN {
p: ENTRY PROC ~ TRUSTED {
IO.PutF[TraceFileStream, "TAEnd at %g\n", IO.card[thisRecord.low] ];
IO.Flush[TraceFileStream];
};
p[];
};
monitoredChangePin[transID: transID, loggingNow: FALSE, forceClear: FALSE, optr: [[0],0,0] , size: 0];
IF ~removeTrans[transID] THEN ERROR;
status _ ErSuccess;
kernCode _ KernSuccess;
};
TAKill: PUBLIC PROC [taPort: portT, tid: tidT, status: INT, raiseSignal: BOOL] RETURNS [kernCode: Mach.kernReturnT _ -1] ~ TRUSTED {
thisRecord: YggLog.RecordID;
transID: YggTransaction.TransID _ LOOPHOLE[tid];
block: LIST OF YggLog.Block;
blockArrayOfWords: LONG POINTER TO ARRAY[0..1024/4) OF CARD32;
block _ getScratchBlock[];
block.first.length _ 2;
blockArrayOfWords _ LOOPHOLE[block.first.base];
blockArrayOfWords[0] _ tid.top.highTicker;
blockArrayOfWords[1] _ tid.top.lowTicker;
YggTransaction.Suspend[transID, ErWaitingTransAborted];
[thisRecord: thisRecord] _ YggLog.Write[trans: tid, logRecordPhaseType: analysis,
recordType: abortTrans, optr: [[0],0,0], recordData: block.first, force: TRUE];
IF TraceLogWriting AND TraceFileStream = NIL THEN OpenTraceFileAndStream[];
IF TraceLogWriting THEN {
p: ENTRY PROC ~ TRUSTED {
IO.PutF[TraceFileStream, "TAKill at %g\n", IO.card[thisRecord.low] ];
IO.Flush[TraceFileStream];
};
p[];
};
monitoredChangePin[transID: tid, loggingNow: FALSE, forceClear: FALSE, optr: [[0],0,0] , size: 0];
returnScratchBlock[block];
kernCode _ KernSuccess;
};
savedScratchBlocks: LIST OF YggLog.Block _ NIL;


getScratchBlock: ENTRY PROC RETURNS [block: LIST OF YggLog.Block] ~ {
ENABLE UNWIND => {};
IF savedScratchBlocks # NIL THEN {
block _ savedScratchBlocks;
savedScratchBlocks _ savedScratchBlocks.rest;
}
 ELSE {
interval: VM.Interval;
interval _ VM.Allocate[count: VM.PagesForBytes[1024]];
block _ LIST[[base: LOOPHOLE[VM.AddressForPageNumber[interval.page]], length: 1024/4, rest: NIL]];
};
};

returnScratchBlock: ENTRY PROC [block: LIST OF YggLog.Block] ~ {
block.rest _ savedScratchBlocks;
savedScratchBlocks _ block;
};

savedScratchTrans: Trans;
savedScratchTransForEntries: Trans _ NEW[TransRep];

subtransactionAndTransactionMap: RedBlackTree.Table;

checkpointNullTransObj: Trans _ NEW[TransRep];

Trans: TYPE = REF TransRep;
TransRep: TYPE = RECORD [
transID: YggEnvironment.TransID,
outcome: YggEnvironment.Outcome,
latched: BOOL _ FALSE,
finishTime: BasicTime.GMT _ BasicTime.nullGMT,
suspendTime: BasicTime.GMT _ BasicTime.nullGMT,
pageBucketsModified: RECORD[
low32: CARD32,
high32: CARD32
]
];

forABit: CONDITION;

getScratchTrans: ENTRY PROC RETURNS [scratchTrans: Trans] ~ {
ENABLE UNWIND => {};
IF savedScratchTrans # NIL THEN {
scratchTrans _ savedScratchTrans;
savedScratchTrans _ NIL;
}
 ELSE {
scratchTrans _ NEW[TransRep];
};
};

noteNewTrans: PROC [transID: YggEnvironment.TransID] RETURNS [parentOK: BOOL _ TRUE] ~ {
newTrans: Trans;
insertTrans: ENTRY PROC ~ {
ENABLE UNWIND => {};
data: RedBlackTree.UserData;
IF YggTransaction.IsTopLevel[transID] THEN {
savedScratchTransForEntries.transID _ transID;
data _ RedBlackTree.Lookup[subtransactionAndTransactionMap, savedScratchTransForEntries];
IF data # NIL THEN ERROR;
}
 ELSE ERROR;
RedBlackTree.Insert[subtransactionAndTransactionMap, newTrans, newTrans];
};
newTrans _ NEW[TransRep _ [transID: transID, outcome: active, pageBucketsModified: [0, 0] ]];
insertTrans[];
};

StateDuringRecovery: PUBLIC PROC [transID: YggEnvironment.TransID] RETURNS [outcome: YggEnvironment.Outcome] ~ {
transFound: BOOL _ FALSE;
trans: Trans _ NIL;
[transFound, trans] _ FindTrans[transID];
IF transFound THEN {
RETURN[commit];
}
 ELSE RETURN[unknown];
};

FindTrans: ENTRY PROC [transID: YggEnvironment.TransID, setLatch: BOOL _ FALSE] RETURNS [transFound: BOOL _ FALSE, trans: Trans _ NIL] ~ {
ENABLE UNWIND => {};
[transFound, trans] _ innerFindTrans[transID, setLatch];
};

innerFindTrans: INTERNAL PROC [transID: YggEnvironment.TransID, setLatch: BOOL _ FALSE] RETURNS [transFound: BOOL _ FALSE, trans: Trans _ NIL] ~ {
ENABLE UNWIND => {};
data: RedBlackTree.UserData;
IF YggTransaction.IsNullTrans[transID] THEN RETURN [transFound: TRUE, trans: checkpointNullTransObj];
savedScratchTransForEntries.transID _ transID;
data _ RedBlackTree.Lookup[subtransactionAndTransactionMap, savedScratchTransForEntries];
IF data = NIL THEN {
RETURN[FALSE, NIL];
}
 ELSE {
trans _ NARROW[data];
WHILE trans.latched DO WAIT forABit ENDLOOP;
IF setLatch THEN trans.latched _ TRUE;
RETURN[TRUE, trans];
};
};

unlatchTrans: ENTRY PROC [trans: Trans] ~ {
trans.latched _ FALSE;
};

removeTrans: ENTRY PROC [transID: YggEnvironment.TransID] RETURNS [transFound: BOOL _ FALSE] ~ {
data: RedBlackTree.UserData;
savedScratchTransForEntries.transID _ transID;
data _ RedBlackTree.Lookup[subtransactionAndTransactionMap, savedScratchTransForEntries];
IF data = NIL THEN {
RETURN[FALSE];
}
 ELSE {
trans: Trans;
trans _ NARROW[data];
[] _ RedBlackTree.Delete[subtransactionAndTransactionMap, savedScratchTransForEntries];
RETURN[TRUE];
};
};

GetKeyProc: RedBlackTree.GetKey  = {  
trans: Trans _ NARROW[data];
RETURN[ trans ];
};

CompareProc: RedBlackTree.Compare = {
dataTrans: Trans _ NARROW[data];
keyTrans: Trans _ NARROW[k];
SELECT keyTrans.transID.bottom.nodeId.value FROM
> dataTrans.transID.bottom.nodeId.value => RETURN [greater];
< dataTrans.transID.bottom.nodeId.value => RETURN [less];
ENDCASE => {
SELECT keyTrans.transID.bottom.highTicker FROM
> dataTrans.transID.bottom.highTicker => RETURN [greater];
< dataTrans.transID.bottom.highTicker => RETURN [less];
ENDCASE => {
SELECT keyTrans.transID.bottom.lowTicker FROM
> dataTrans.transID.bottom.lowTicker => RETURN [greater];
< dataTrans.transID.bottom.lowTicker => RETURN [less];
ENDCASE => RETURN [equal];
};
};
};
pageMask: CARD32 = 077B;
noBuckets: CARD = 64;
byteMask: CARD32 = 01777B;
bytesPerBucket: CARD = 1024;

pageBuckets: ARRAY [0..noBuckets) OF LIST OF pinItem;
pinItem: TYPE = RECORD[
transID: YggEnvironment.TransID,
optr: optrT,
size: uInt,
pc: pinCode
];
pinCode: TYPE = {pin, pinAndLogged, preventPin};
hashOptr: PROC [optr: optrT] RETURNS [CARD] ~ {
lowPageNo: CARD32;
lowPageNo _ PBasics.BITRSHIFT[optr.lowOffset, 10];
RETURN[PBasics.BITAND[lowPageNo, pageMask]];
};
tooLow: BOOL _ FALSE;
debugAddress: CARD32 _ 1;
debugHits: INT _ 0;

rememberPin: ENTRY PROC [transID: YggEnvironment.TransID, optr: optrT, size: uInt, doPreventPin: BOOL _ FALSE] ~ {
nowOptr: optrT;
sizeLeft: uInt;
innerRememberPin: INTERNAL PROC [thisOptr: optrT, bytes: CARD] RETURNS [tryAgain: BOOL _ FALSE] ~ {
ENABLE UNWIND => {};
hashPage: CARD;
lowPageNo: CARD32;
transFound: BOOL _ FALSE;
trans: Trans _ NIL;
lowPageNo _ PBasics.BITRSHIFT[thisOptr.lowOffset, 10];
hashPage _ hashOptr[thisOptr];
FOR lopi: LIST OF pinItem _ pageBuckets[hashPage], lopi.rest UNTIL lopi = NIL DO
loopLowPageNo: CARD32;
loopLowPageNo _ PBasics.BITRSHIFT[lopi.first.optr.lowOffset, 10];
IF loopLowPageNo = lowPageNo AND lopi.first.pc = preventPin THEN RETURN[TRUE]
ENDLOOP;
pageBuckets[hashPage] _ CONS[[transID, thisOptr, bytes, pin], pageBuckets[hashPage]];
[transFound, trans] _ innerFindTrans[transID];
IF ~transFound THEN ERROR;
IF hashPage < 32 THEN {
trans.pageBucketsModified.low32 _ PBasics.BITOR[PBasics.BITLSHIFT[value: 1, count: hashPage], trans.pageBucketsModified.low32];
}
 ELSE {
trans.pageBucketsModified.high32 _ PBasics.BITOR[PBasics.BITLSHIFT[value: 1, count: hashPage-32], trans.pageBucketsModified.high32];
};
};
nowOptr _ optr;
sizeLeft _ size;
IF optr.segmentId.value < 50 AND optr.segmentId.value # 0 THEN {
tooLow _ TRUE;
};
IF optr.lowOffset = debugAddress THEN {
debugHits _ debugHits + 1;
};
WHILE sizeLeft > 0 DO
firstByteOnPage: CARD;
bytesThisPage: CARD;
firstByteOnPage _ PBasics.BITAND[nowOptr.lowOffset, byteMask];
bytesThisPage _ MIN[sizeLeft, bytesPerBucket - firstByteOnPage];
IF bytesThisPage = 0 OR bytesThisPage > bytesPerBucket THEN ERROR;
IF innerRememberPin[nowOptr, bytesThisPage] THEN {
WAIT forABit;
LOOP;
};
sizeLeft _ sizeLeft - bytesThisPage;
nowOptr.lowOffset _ nowOptr.lowOffset + bytesThisPage;
IF sizeLeft # 0 AND PBasics.BITAND[nowOptr.lowOffset, byteMask] # 0 THEN ERROR;
ENDLOOP;
};

monitoredChangePin: ENTRY PROC [transID: YggTransaction.TransID, loggingNow: BOOL, optr: optrT, forceClear: BOOL, size: uInt] ~ {
changePin[transID, loggingNow, forceClear, optr, size];
};

changePin: INTERNAL PROC [transID: YggTransaction.TransID, loggingNow: BOOL, forceClear: BOOL, optr: optrT, size: uInt] ~ {
trans: Trans;
transFound: BOOL _ TRUE;
lowMod: CARD32;
highMod: CARD32;
gotIt: BOOL _ FALSE;
nowOptr: optrT;
sizeLeft: uInt;
removePinFromBucket: PROC [bucket: CARD, exactMatch: BOOL, thisOptr: optrT, bytes: CARD] RETURNS [gotOne: BOOL _ FALSE] ~ {
prev: LIST OF pinItem _ NIL;
FOR lopi: LIST OF pinItem _ pageBuckets[bucket], lopi.rest UNTIL lopi = NIL DO
IF YggTransaction.EqualTrans[trans.transID, lopi.first.transID] AND (~loggingNow OR ~exactMatch OR (lopi.first.optr.segmentId = thisOptr.segmentId AND lopi.first.optr.lowOffset = thisOptr.lowOffset)) THEN {
IF loggingNow THEN {
IF lopi.first.pc # pin THEN LOOP;
lopi.first.pc _ pinAndLogged;
}
 ELSE {
IF ~forceClear AND lopi.first.pc # pinAndLogged THEN ERROR;
IF prev = NIL THEN pageBuckets[bucket] _ lopi.rest
 ELSE prev.rest _ lopi.rest;
};
gotOne _ TRUE;
LOOP;
};
prev _ lopi;
ENDLOOP;
};
[transFound, trans] _ innerFindTrans[transID];
IF ~transFound THEN ERROR;
IF optr.lowOffset = debugAddress THEN {
debugHits _ debugHits + 1;
};
IF optr = [[0],0,0] AND size = 0 THEN {
gotOne: BOOL _ FALSE;
lowMod _ trans.pageBucketsModified.low32;
FOR bucktNo: INT IN [0..32) DO
IF PBasics.BITAND[lowMod, 1] = 1 THEN {
gotOne _ removePinFromBucket[bucktNo, FALSE, optr, size];
gotIt _ gotIt OR gotOne;
IF ~gotOne THEN ERROR;
};
lowMod _ PBasics.BITRSHIFT[value: lowMod, count: 1];
ENDLOOP;
highMod _ trans.pageBucketsModified.high32;
FOR bucktNo: INT IN [32..64) DO
IF PBasics.BITAND[highMod, 1] = 1 THEN {
gotOne _ removePinFromBucket[bucktNo, FALSE, optr, size];
gotIt _ gotIt OR gotOne;
IF ~gotOne THEN ERROR;
};
highMod _ PBasics.BITRSHIFT[value: highMod, count: 1];
ENDLOOP;
IF ~loggingNow THEN trans.pageBucketsModified _ [0 ,0];
}
 ELSE {
nowOptr _ optr;
sizeLeft _ size;
IF optr.segmentId.value < 50 AND optr.segmentId.value # 0 THEN {
tooLow _ TRUE;
};
WHILE sizeLeft > 0 DO
firstByteOnPage: CARD;
bytesThisPage: CARD;
bucktNo: INT;
gotOne: BOOL _ FALSE;
firstByteOnPage _ PBasics.BITAND[nowOptr.lowOffset, byteMask];
bytesThisPage _ MIN[sizeLeft, bytesPerBucket - firstByteOnPage];
IF bytesThisPage = 0 OR bytesThisPage > bytesPerBucket THEN ERROR;
bucktNo _ hashOptr[nowOptr];
IF ~(gotOne _ removePinFromBucket[bucktNo, TRUE, nowOptr, bytesThisPage]) THEN ERROR;
sizeLeft _ sizeLeft - bytesThisPage;
nowOptr.lowOffset _ nowOptr.lowOffset + bytesThisPage;
IF sizeLeft # 0 AND PBasics.BITAND[nowOptr.lowOffset, byteMask] # 0 THEN ERROR;
ENDLOOP;
IF ~loggingNow THEN trans.pageBucketsModified _ [0 ,0];
};
};
CALookup: PUBLIC PROC [nameServerPort: Mach.portT, name: Rope.ROPE, site: Rope.ROPE, numberWanted: INT, maxSeconds: INT, raiseSignal: BOOL] RETURNS [portList: Mach.ListOfPorts, kernCode: Mach.kernReturnT] ~ {
portList _ LIST[[9]];
kernCode _ KernSuccess;
};

GetNextTrans: ENTRY PROC RETURNS [transID: YggTransaction.TransID] ~ {
NextTransCount _ NextTransCount + 1;
transID _ [top: [lowTicker: NextTransCount], bottom: [lowTicker: NextTransCount]];
};
DoCommit: PROC [transID: YggTransaction.TransID, doCommit: BOOL] ~ {
[] _ YggTransaction.Finish[transID, IF doCommit THEN commit ELSE abort];
};
STServer: PUBLIC PROC [inMsg: REF Camelot.camlibSysReqMsgT, outMsg: REF Camelot.camlibSysRepMsgT] RETURNS [messageUnderstood: BOOL _ FALSE] ~ {
};
SRServer: PUBLIC PROC [inMsg: REF Camelot.camlibSysReqMsgT, outMsg: REF Camelot.camlibSysRepMsgT] RETURNS [messageUnderstood: BOOL _ FALSE] ~ {
};
ATServer: PUBLIC PROC [inMsg: REF Camelot.camlibSysReqMsgT, outMsg: REF Camelot.camlibSysRepMsgT] RETURNS [messageUnderstood: BOOL _ FALSE] ~ {
};
milliSecondsBetweenCheckpoint: INT _ 30000;
ephocsBetweenCleans: CARD _ 2;

CheckpointProcess: PROC ~ {
FOR checkpointCount: INT IN [1 ..INT.LAST] DO
loai: LIST OF AllocItem;
now: BasicTime.GMT;
segmentId: segmentIdT;
IF checkpointCount > 1 THEN Process.PauseMsec[milliSecondsBetweenCheckpoint];
IF GoAway THEN EXIT;
now _ BasicTime.Now[];
CheckPointEphocNumber _ CheckPointEphocNumber + 1;
DO
findABufferToFlush: ENTRY PROC RETURNS [gotOne: BOOL _ FALSE] ~ {
FOR loai _ VMAllocList, loai.rest UNTIL loai = NIL DO
IF loai.first.dirtied AND loai.first.allocated AND loai.first.cvmHandle # NIL AND loai.first.pagingObject # LogPagingObject THEN {
IF CheckPointEphocNumber - loai.first.ephocOfLastWrite > 2 THEN {
loai.first.ownedByCheckpointProcess _ TRUE;
RETURN [TRUE];
};
};
ENDLOOP;

};
IF ~findABufferToFlush[] THEN EXIT;
checkpointNullTransObj.pageBucketsModified _ [0, 0];
segmentId _ SegementIdForPagingObject[loai.first.pagingObject];
rememberPin[transID: YggEnvironment.nullTransID, optr: [segmentId: segmentId, highOffset: 0, lowOffset: loai.first.offset], size: loai.first.size, doPreventPin: TRUE];
{
pages: INT _ -1;
firstPage: INT _ -1;
pages _ FS.PagesForBytes[loai.first.size];
firstPage _ FS.PagesForBytes[loai.first.offset];
FS.Write[file: CamelotRecoverable.CamelotRecoverableFile, to: firstPage, nPages: pages, from: LOOPHOLE[loai.first.mappedAddress]];
loai.first.timeOfLastWrite _ now;
loai.first.ephocOfLastWrite _ CheckPointEphocNumber;
loai.first.dirtied _ FALSE;
loai.first.ownedByCheckpointProcess _ FALSE;
};
monitoredChangePin [transID: YggEnvironment.nullTransID, loggingNow: FALSE, forceClear: TRUE, optr: [[0],0,0], size: 0];
ENDLOOP;
{
checkpointCompleteRecordBody: YggLogRep.CheckpointCompleteRecord _
[startAnalysisRecordID: YggLog.nullRecordID, keepRecordID: YggLog.nullRecordID, checkPointEphocNumber: CheckPointEphocNumber];
thisRecord: YggLog.RecordID;
thisWordNumber: YggEnvironment.WordNumber;
TRUSTED {
checkpointCompleteRecordBody.blockArrayOfWords[0] _ 5910;
checkpointCompleteRecordBody.blockArrayOfWords[1] _ 42;
[thisRecord: thisRecord, thisWordNumber: thisWordNumber] _ YggLogBasic.Put[
from: [base: @checkpointCompleteRecordBody, length: SIZE[YggLogRep.CheckpointCompleteRecord]/WordsINWORDS],
optr: [[0], 0, 0],
writeID: TRUE,
force: TRUE];
IF TraceLogWriting AND TraceFileStream = NIL THEN OpenTraceFileAndStream[];
IF TraceLogWriting THEN TRUSTED {
p: ENTRY PROC ~ TRUSTED {
IO.PutF[TraceFileStream, "Checkpoint at %g\n", IO.card[thisRecord.low]];
IO.Flush[TraceFileStream];
};
p[];
};
};

YggRestartFile.WriteRestartRecord[wordNumberForCheckpointCompleteRecord: thisWordNumber, recordIDForCheckpointCompleteRecord: thisRecord];
};
ENDLOOP;
};

ZeroBackingStore: PROC = {
segmentId: segmentIdT;
po: pagingObjectT;
lowOffset: CARD32 _ 0;
cvmHandle: CountedVM.Handle;
segmentId _ SegementIdForPagingObject[RecoverableMemoryPagingObject];
po _ PagingObjectForSegementId[segmentId];
cvmHandle _ CountedVM.Allocate[words: 32768/BYTES[WORD]];
TRUSTED {PBasics.Fill[where: LOOPHOLE[cvmHandle.pointer], nWords: 32768/PBasics.bytesPerWord, value: 0];};
WHILE lowOffset < RecoverableMemoryPagingSize DO
FS.Write[file: CamelotRecoverable.CamelotRecoverableFile, to: FS.PagesForBytes[lowOffset], nPages: FS.PagesForBytes[32768], from: LOOPHOLE[cvmHandle.pointer]];
lowOffset _ lowOffset + 32768;
ENDLOOP;
cvmHandle _ NIL;
};

ZeroTwoMegsOfBackingStore: PROC = {
segmentId: segmentIdT;
po: pagingObjectT;
lowOffset: CARD32 _ 0;
cvmHandle: CountedVM.Handle;
sizeToZero: CARD32 _ 1024;
sizeToZero _ 2*1024*sizeToZero;
segmentId _ SegementIdForPagingObject[RecoverableMemoryPagingObject];
po _ PagingObjectForSegementId[segmentId];
cvmHandle _ CountedVM.Allocate[words: 32768/BYTES[WORD]];
TRUSTED {PBasics.Fill[where: LOOPHOLE[cvmHandle.pointer], nWords: 32768/PBasics.bytesPerWord, value: 0];};
WHILE lowOffset < sizeToZero DO
FS.Write[file: CamelotRecoverable.CamelotRecoverableFile, to: FS.PagesForBytes[lowOffset], nPages: FS.PagesForBytes[32768], from: LOOPHOLE[cvmHandle.pointer]];
lowOffset _ lowOffset + 32768;
ENDLOOP;
cvmHandle _ NIL;
};


LogAnalysisProc: YggLogControl.AnalysisProc = {
SELECT type FROM
commitTrans => {
[] _ noteNewTrans[trans];
};
abortTrans => {};
ENDCASE => ERROR;
};

RecoveryBlock: REF ARRAY [0..4096) OF CARD32;

LogRecoveryProc: YggLog.RecoveryProc = {
SELECT type FROM
writeBytes => {
IF FindTrans[trans, FALSE].transFound THEN {
status: YggLog.ReadProcStatus;
wordsRead: CARDINAL;
sizeOfRecordDataInWords: CARD;
recordHeader: YggLogRep.TransactionHeader;
recordData: LONG POINTER;
recordHeader _ YggLogControl.PeekCurrentTransactionHeader[record];
[status: status, wordsRead: wordsRead] _ YggLog.ReadForRecovery[thisRecord: record, wordsToSkip: 0, to: [base: LOOPHOLE[RecoveryBlock], length: 4096]];
IF status = destinationFull THEN ERROR;
IF wordsRead < 4 THEN ERROR;  -- fix this
sizeOfRecordDataInWords _ wordsRead - WORDS[YggLogRep.TransactionHeader]/WORDS[CARD32];
recordData _ LOOPHOLE[RecoveryBlock, LONG POINTER] + UNITS[YggLogRep.TransactionHeader];
TRUSTED {YggBuffMan.WriteBytes[optr: recordHeader.optr, value: recordData, valueCnt: sizeOfRecordDataInWords*BYTES[CARD32]];};
};
};
ENDCASE => ERROR;
};


Init: PROC = {
subtransactionAndTransactionMap _ RedBlackTree.Create[getKey: GetKeyProc, compare: CompareProc];
TRUSTED {Process.InitializeCondition[@forABit, Process.MsecToTicks[10]]; };
RecoveryBlock _ NEW[ARRAY [0..4096) OF CARD32];
YggLogControl.RegisterAnalysisProc[recordType: commitTrans, analysisProc: LogAnalysisProc];
YggLogControl.RegisterAnalysisProc[recordType: abortTrans, analysisProc: LogAnalysisProc];
YggLog.RegisterRecoveryProc[recordType: writeBytes, recoveryProc: LogRecoveryProc];
};

CamelotRecoveryComplete: PUBLIC PROC [] ~ {
RecoveryBlock _ NIL;
subtransactionAndTransactionMap _ RedBlackTree.Create[getKey: GetKeyProc, compare: CompareProc];  -- create again after recovery to empty out trans seen during recovery
TRUSTED {Process.Detach[FORK CheckpointProcess[]]};
YggdrasilInit.RecoveryComplete[];
};

Init[];

END.

�MachCamelotEmulationForSunOSImpl.mesa
Copyright Ó 1988, 1989 by Xerox Corporation.  All rights reserved.
Bob Hagmann July 6, 1989 8:36:55 am PDT
Exported junk
Global data 
Exported task procedures
get my task
get my notify port (task_notify)


Exported virtual memory procedures
Grab some VM.

Map some externally backed memory into VM.

Map some externally backed memory into VM.
interval: VM.Interval;
interval _ VM.Allocate[count: VM.PagesForBytes[size]];

Unmap some externally backed memory into VM, whether externally backed or not.
TRUSTED{VM.Free[interval: loai.first.interval];};
REPEAT FINISHED => ERROR;
Exported message procedures
send a message


Receive a message.
Modifies the header!

Exported port procedures
get my port to the name server  (name_server_port)

get my port to the service port  (service_port)

send a message


restricts port so that msgReceive must be used the port number, not PortDefault

unrestricts port so that PortDefault to msgReceive can receive from this port

Netname
"check in a name into the local name space"

Exported recoverable storage management procedures
Initialize the data server.

Pin an object in preparation for modification.  optr is the Camelot recoverable storage "address", not the VM address

Send a new value of an object to the log.

Send a new value of an object to the log.
[] _ YggLog.Write[trans: tid, logRecordPhaseType: undo,
recordType: writeBytes, optr: optr, recordData: [base: LOOPHOLE[oldValue], length: (newValueCnt+3)/4, rest: NIL], force: FALSE];

Init the shared memory queue (emulation does nothing).


Preflush some dirty memory
TRUSTED{VM.Free[interval: loai.first.interval];};


Zero some memory.

Exported transaction management procedures
Initialize an application to the transaction manager.

Start a new transaction.

Try to commit a transaction.

Try to abort a transaction.
Insert backwards scan of log, calling CamelotMIG.SRRestoreObjectX

Internal block allocation
Internal transaction procedures
Internal red black procs
A Red Black tree is used to store and find transactions/subtransactions.  The tree is indexed by subtransaction.  
PROC [data: UserData] RETURNS [Key]
PROC [k: Key, data: UserData] RETURNS [Basics.Comparison]
Internal transaction procedures
pin => it's pinned and maybe updated
pinAndLogged => it's pinned and updated, and the log write has been buffered.  A flush of the log will make everything OK.
preventPin => disallow pins for this page

Name server

Lookup for applications.

Local procs 

YggdrasilInit


Checkpoint process
data: RedBlackTree.UserData;
[thisRecord: thisRecord, thisWordNumber: thisWordNumber] _ YggLog.Write[
trans: YggEnvironment.nullTransID,
logRecordPhaseType: other,
recordType: checkpointComplete,
optr: [[0],0,0],
recordData:  [base: @checkpointCompleteRecordBody, length: SIZE[YggLogRep.CheckpointCompleteRecord]/WordsINWORDS],
force: TRUE,
writeID: TRUE];
Zero backing store
ZeroBackingStore: PROC = {
segmentId: segmentIdT;
po: pagingObjectT;
lowOffset: CARD32 _ 0;
segmentId _ SegementIdForPagingObject[RecoverableMemoryPagingObject];
po _ PagingObjectForSegementId[segmentId];
WHILE lowOffset < RecoverableMemoryPagingSize DO
mappedAddress: vmAddressT _ 0;
[mappedAddress: mappedAddress] _ vmAllocateWithPagerInner[4096, po, lowOffset, TRUE];
DSQZeroFill[dsPort: YggEnvironment.dsPort, optr: [segmentId: segmentId, highOffset: 0, lowOffset: lowOffset], sizeInBytes: 4096];
[] _ vmDeallocate[taskSelf[], mappedAddress, 4096, TRUE];
lowOffset _ lowOffset + 4096;
ENDLOOP;
};

Log analysis and processing
PROC [record: RecordID, type: RecordType, trans: TransID];
Analysis of commitTrans and abortTrans
PROC [record: RecordID, type: RecordType, trans: YggEnvironment.TransID, outcome: YggEnvironment.Outcome];
Recovery of writeBytes
Now we have:
sizeOfRecordDataInWords 32 bit words of data starting at recordData
it is for optr of recordHeader.optr
= [segmentId: segmentIdT, highOffset: CARD16, lowOffset: CARD32]
Initialization

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