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smmSmallMemory.pas
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unit smmSmallMemory;
interface
{$Include smmOptions.inc}
uses
smmTypes, smmStatistics;
type
PSmallMemHeader = ^TSmallMemHeader;
PSmallMemBlock = ^TSmallMemBlock;
PSmallMemBlockList = ^TSmallMemBlockList;
PSmallMemThreadManager = ^TSmallMemThreadManager;
PSmallMemHeaderFree = ^TSmallMemHeaderFree;
//? {$A-} { all object/record must be packed }
/// Header appended to the beginning of every allocated memory block
TSmallMemHeader = object
{$IFDEF SCALEMM_MAGICTEST}
Magic1: NativeInt;
Magic2: NativeInt;
{$ELSE}
{$IFDEF Align16Bytes}
{$ifndef CPUX64}
Filer1: Pointer; // 16 bytes aligned for 32 bit compiler
Filer2: Pointer;
{$endif}
{$ENDIF}
{$ENDIF}
Size: NativeUInt;
/// the memory block handler which owns this memory block
/// must be last item of header (same negative offset from mem as TBaseMemHeader)
OwnerBlock : PSmallMemBlock;
procedure CheckMem;
end;
TSmallMemHeaderFree = object
{$IFDEF SCALEMM_MAGICTEST}
Magic1: NativeInt;
Magic2: NativeInt;
{$ELSE}
{$IFDEF Align16Bytes}
{$ifndef CPUX64}
Filer1: Pointer; // 16 bytes aligned for 32 bit compiler
Filer2: Pointer;
{$endif}
{$ENDIF}
{$ENDIF}
Size: NativeUInt;
/// the memory block handler which owns this memory block
OwnerBlock: PSmallMemBlock;
//Extra data of free item:---------------------------------
/// linked to next single memory item (other thread freem mem)
NextFreeItem : PSmallMemHeaderFree;
end;
TSplitRecord = record
case Byte of
1: (CompleteRef: NativeInt);
2: (DummyRef: Int16;
Counter : Int16;)
end;
/// memory block handler
TSmallMemBlock = object
/// Thread owner, must be first item of block (same offset as PBaseBlockMemory)
OwnerManager: PSmallMemThreadManager;
/// the memory block list which owns this memory block handler
OwnerList: PSmallMemBlockList;
FNextThreadFreedBlock: PSmallMemBlock;
{$IFDEF Align8Bytes}
{$ifndef CPUX64}
Filer1: Pointer; // 8 bytes aligned -> 12 + 4 = 16 (32bit)
{$endif}
{$ENDIF}
{$IFDEF Align16Bytes}
Filer1: Pointer; // 16 bytes aligned -> 12 + 4 = 16 (32bit)
//24 + 8 = 32 (64bit)
{$ENDIF}
FFirstThreadFreed: PSmallMemHeaderFree;
//FThreadFreedCount: Integer; //negative = lock
FLockReference: TSplitRecord; //ABA threading lock
/// how much mem is used, max is C_ARRAYSIZE
FUsageCount: NativeUInt;
/// how much mem is free
FFreedIndex: NativeUInt;
/// internal storage of the memory blocks
// - will contain array[0..C_ARRAYSIZE-1] of memory items,
// i.e. (FItemSize + SizeOf(TSmallMemHeader)) * C_ARRAYSIZE bytes
FMemoryArray: Pointer;
{ TODO -oAM : bitmap/bitarray instead of full pointer array? }
FFreedArray: array[0..C_ARRAYSIZE] of PSmallMemHeader;
/// link to the next list with free memory
FNextMemBlock: PSmallMemBlock;
/// link to the previous list with free memory
// - double linked to be able for fast removal of one block
FPreviousMemBlock: PSmallMemBlock;
/// link to the next list with freed memory, in case this list has no more freed mem
FNextFreedMemBlock: PSmallMemBlock;
/// link to the previous list with freed memory
FPreviousFreedMemBlock: PSmallMemBlock;
FLock: NativeInt;
{$IFDEF SCALEMM_DEBUG}
OwnerThreadId: NativeUInt;
// {$IFDEF Align8Bytes}
// {$ifndef CPUX64}
// Filler1: Pointer; // 8 bytes aligned
// {$endif}
// {$ENDIF}
{$ELSE}
{$IFDEF Align8Bytes}
{$ifndef CPUX64}
Filler2: Pointer; // 8 bytes aligned -> 188 + 4 = 192 (32bit)
{$endif}
{$ENDIF}
{$IFDEF Align16Bytes}
Filler3: Pointer; // 16 bytes aligned
{$ENDIF}
{$ENDIF}
function GetUsedMemoryItem: PSmallMemHeader; {$ifdef HASINLINE}inline;{$ENDIF}
procedure FreeMem(aMemoryItem: PSmallMemHeader); {$ifdef HASINLINE}inline;{$ENDIF}
procedure Lock; {$ifdef HASINLINE}inline;{$ENDIF}
procedure UnLock; {$ifdef HASINLINE}inline;{$ENDIF}
procedure ThreadFreeMem(aMemoryItem: PSmallMemHeader);
function IsFree: Boolean;
procedure FreeBlockMemory;
procedure CheckMem(aDirection: TScanDirection = sdBoth);
procedure DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PSmallMemBlockListStats);
end;
/// memory block list
// - current size if 16 bytes (this is a packed object)
TSmallMemBlockList = object
/// the per-thread memory manager which created this block
OwnerManager: PSmallMemThreadManager;
/// list containing freed memory (which this block owns)
// - used to implement a fast caching of memory blocks
FFirstFreedMemBlock: PSmallMemBlock;
/// list containing all memory this block owns
FFirstMemBlock: PSmallMemBlock;
/// size of memory items (32, 64 etc bytes)
//FItemSize : word;
FItemSize : NativeUInt;
/// recursive check when we alloc memory for this blocksize (new memory list)
FRecursive: Boolean;
{$ifdef CPUX64}
// for faster "array[0..7] of TSmallMemBlockList" calc
// (for 32 bits, the TSmallMemBlockList instance size if 16 bytes)
FFiller: array[1..sizeof(NativeInt)-4] of byte;
{$endif}
procedure AddNewMemoryBlock;
function GetMemFromNewBlock: Pointer;
function GetBlockSize: Integer;
procedure CheckMem;
procedure DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PSmallMemBlockListStats);
end;
/// handles per-thread memory managment
TSmallMemThreadManager = object
public
SizeType : TSizeType;
OwnerThread: PBaseThreadManager;
{$IFDEF Align16Bytes}
{$ifndef CPUX64}
Filer1: Int32;
Filer2: Int32; // 16 bytes aligned -> 40 + 8 = 48 (32bit)
{$endif} //80 (64bit)
{$ENDIF}
private
FFirstThreadFreeBlock: PSmallMemBlock;
FDummyCounter: NativeInt;
/// array with memory per block size of 32 bytes (mini blocks)
// - i.e. 32, 64, 96, 128, 160, 192, 224 bytes
FMiniMemoryBlocks: array[0..6] of TSmallMemBlockList;
/// array with memory per block size of 256 bytes (small blocks)
// - i.e. 256,512,768,1024,1280,1536,1792[,2048] bytes
FSmallMemoryBlocks: array[0..MAX_SMALLMEMBLOCK] of TSmallMemBlockList;
//FLock: NativeInt;
//procedure Lock;
//procedure UnLock;
public
procedure Init;
procedure Reset;
function IsMemoryFromOtherThreadsPresent: Boolean; {$ifdef HASINLINE}inline;{$ENDIF}
procedure FreeThreadFreedMem;
procedure ReleaseAllFreeMem;
procedure MoveAllMemToOtherManager(aOtherManager: PSmallMemThreadManager);
function GetBlockListOfSize(aItemSize: NativeUInt): PSmallMemBlockList;
procedure CheckAllMem;
procedure CheckMem(aMemory: Pointer);
procedure DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PThreadMemManagerStats);
function GetMem(aSize: NativeUInt): Pointer; {$ifdef HASINLINE}inline;{$ENDIF}
function FreeMem(aMemory: Pointer; aRecursive: Boolean = false): NativeInt; {$ifdef HASINLINE}inline;{$ENDIF}
function ReallocMem(aMemory: Pointer; aSize: NativeUInt): Pointer; //{$ifdef HASINLINE}inline;{$ENDIF}
end;
implementation
uses
smmGlobal, ScaleMM2, smmFunctions,
smmMediumMemory{needed for inline},
smmLargeMemory{needed for inline};
{ TSmallMemHeader }
procedure TSmallMemHeader.CheckMem;
begin
{$IFDEF SCALEMM_DEBUG}
if Self.OwnerBlock.OwnerThreadId > 1 then
Assert(Self.OwnerBlock.OwnerThreadId = GetCurrentThreadId);
{$ENDIF}
{$IFDEF SCALEMM_MAGICTEST}
Assert(Magic1 = 1234567890);
Assert(Magic2 = 1122334455);
{$ENDIF}
Assert(Size > 0);
Assert(OwnerBlock <> nil);
Assert(OwnerBlock.OwnerList <> nil);
Assert(OwnerBlock.OwnerList.FItemSize = Size);
end;
{ TSmallMemBlock }
procedure TSmallMemBlock.CheckMem(aDirection: TScanDirection = sdBoth);
begin
{$IFDEF SCALEMM_DEBUG}
if (Self.OwnerThreadId > 1) then // and (Self.OwnerThreadId < MaxInt) then
begin
Assert(Self.OwnerThreadId = GetCurrentThreadId);
Assert(Self.OwnerManager.OwnerThread.FThreadId = GetCurrentThreadId);
Assert(Self.OwnerList.OwnerManager.OwnerThread.FThreadId = GetCurrentThreadId);
end;
{$ENDIF}
//Scale_CheckMem(@Self); owner can be different thread (medium block)
Assert(FMemoryArray <> nil);
Assert(FMemoryArray = Pointer(NativeUInt(@Self) + SizeOf(Self)) );
{$IFDEF SCALEMM_DEBUG}
if (OwnerThreadId = 1) then //or (Self.OwnerThreadId = MaxInt) then
begin
Assert(OwnerManager <> nil);
Assert(OwnerManager.OwnerThread <> nil);
Assert(OwnerThreadId = OwnerManager.OwnerThread.FThreadId);
end
else
begin
Assert(OwnerThreadId = GetCurrentThreadId);
Assert(FMemoryArray <> nil);
Assert(FMemoryArray = Pointer(NativeUInt(@Self) + SizeOf(Self)) );
Assert(OwnerList <> nil);
Assert(OwnerList <> Pointer(1));
Assert(OwnerList.OwnerManager <> nil);
Assert(OwnerList.OwnerManager.OwnerThread <> nil);
Assert(not OwnerList.OwnerManager.OwnerThread.FThreadTerminated);
Assert(OwnerManager <> nil);
Assert(OwnerManager <> Pointer(2));
Assert(OwnerManager = OwnerList.OwnerManager);
Assert(FFreedIndex <= NativeUInt(Length(FFreedArray)));
Assert(FUsageCount <= NativeUInt(Length(FFreedArray)));
Assert(FMemoryArray <> nil);
end;
{$ENDIF}
if FPreviousMemBlock <> nil then
begin
Assert(FPreviousMemBlock.FNextMemBlock = @Self);
{$IFDEF SCALEMM_DEBUG}
Assert(FPreviousMemBlock.OwnerThreadId = Self.OwnerThreadId);
{$ENDIF}
end;
if FPreviousFreedMemBlock <> nil then
begin
{$IFDEF SCALEMM_DEBUG}
if Self.OwnerThreadId > 1 then
Assert( (FPreviousFreedMemBlock.FFreedIndex <> 0) or (FPreviousFreedMemBlock.FUsageCount < C_ARRAYSIZE) ); //must have something free or available
{$ENDIF}
//Assert(FPreviousFreedMemBlock.FNextFreedMemBlock = @Self); todo
{$IFDEF SCALEMM_DEBUG}
Assert(FPreviousFreedMemBlock.OwnerThreadId = Self.OwnerThreadId);
if FPreviousFreedMemBlock.OwnerThreadId = $80808080 then
FPreviousFreedMemBlock := nil;
{$ENDIF}
end;
if (aDirection in [sdBoth, sdPrevious]) then
begin
if FPreviousMemBlock <> nil then
FPreviousMemBlock.CheckMem(sdNone);
if FPreviousFreedMemBlock <> nil then
FPreviousFreedMemBlock.CheckMem(sdNone);
end;
if FNextMemBlock <> nil then
begin
Assert(FNextMemBlock.FPreviousMemBlock = @Self);
{$IFDEF SCALEMM_DEBUG}
Assert(FNextMemBlock.OwnerThreadId = Self.OwnerThreadId);
{$ENDIF}
end;
if FNextFreedMemBlock <> nil then
begin
//Assert( (FNextFreedMemBlock.FFreedIndex <> 0) or (FNextFreedMemBlock.FUsageCount < C_ARRAYSIZE) ); //must have something free or available
//if Self.OwnerManager.OwnerThread.FThreadId > 1 then
Assert(FNextFreedMemBlock.FPreviousFreedMemBlock = @Self);
{$IFDEF SCALEMM_DEBUG}
Assert(FNextFreedMemBlock.OwnerThreadId = Self.OwnerThreadId);
{$ENDIF}
end;
if (aDirection in [sdBoth, sdNext]) then
begin
if FNextMemBlock <> nil then
FNextMemBlock.CheckMem(sdNone);
if FNextFreedMemBlock <> nil then
FNextFreedMemBlock.CheckMem(sdNone);
end;
end;
procedure TSmallMemBlock.DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PSmallMemBlockListStats);
begin
WriteToFile(aFile, ' - SmallBlock @ ');
WriteNativeUIntToHexBuf(aFile, NativeUInt(@Self));
WriteToFile(aFile, ', used count: ');
WriteNativeUIntToStrBuf(aFile, FUsageCount);
WriteToFile(aFile, ', used size: ');
WriteNativeUIntToStrBuf(aFile, FUsageCount * OwnerList.FItemSize);
WriteToFile(aFile, ' - free count: ');
WriteNativeUIntToStrBuf(aFile, C_ARRAYSIZE - FUsageCount);
WriteToFile(aFile, ', free size: ');
WriteNativeUIntToStrBuf(aFile, (C_ARRAYSIZE - FUsageCount) * OwnerList.FItemSize);
WriteToFile(aFile, ' - total count: ');
WriteNativeUIntToStrBuf(aFile, C_ARRAYSIZE);
WriteToFile(aFile, ', total size: ');
WriteNativeUIntToStrBuf(aFile, C_ARRAYSIZE * OwnerList.FItemSize);
WriteToFile(aFile, #13#10);
Inc(aTotalStats.ArrayBlockCount);
Inc(aSingleStats.ArrayBlockCount);
Inc(aTotalStats.TotalUsageCount, FUsageCount);
Inc(aSingleStats.TotalUsageCount, FUsageCount);
end;
procedure TSmallMemBlock.FreeBlockMemory;
{$IFDEF SCALEMM_DEBUG}
var
pOwnerList: PSmallMemBlockList;
{$ENDIF}
begin
if OwnerList.FFirstMemBlock = @Self then
Exit; //keep one block
{$IFDEF SCALEMM_DEBUG}
Self.CheckMem(sdBoth);
{$ENDIF}
if OwnerList.FFirstFreedMemBlock = @Self then
OwnerList.FFirstFreedMemBlock := Self.FNextFreedMemBlock;
if OwnerList.FFirstMemBlock = @Self then
OwnerList.FFirstMemBlock := Self.FNextMemBlock;
// remove ourselves from linked list
if FPreviousMemBlock <> nil then
FPreviousMemBlock.FNextMemBlock := Self.FNextMemBlock;
if FPreviousFreedMemBlock <> nil then
FPreviousFreedMemBlock.FNextFreedMemBlock := Self.FNextFreedMemBlock;
if FNextMemBlock <> nil then
FNextMemBlock.FPreviousMemBlock := Self.FPreviousMemBlock;
if FNextFreedMemBlock <> nil then
FNextFreedMemBlock.FPreviousFreedMemBlock := Self.FPreviousFreedMemBlock;
if OwnerList.FFirstFreedMemBlock <> nil then
begin
OwnerList.FFirstFreedMemBlock.FPreviousFreedMemBlock := nil;
OwnerList.FFirstFreedMemBlock.CheckMem(sdBoth);
end;
if OwnerList.FFirstMemBlock <> nil then
begin
OwnerList.FFirstMemBlock.FPreviousMemBlock := nil;
OwnerList.FFirstMemBlock.CheckMem(sdBoth);
end;
{$IFDEF SCALEMM_DEBUG}
FPreviousFreedMemBlock := nil;
FNextMemBlock := nil;
FNextFreedMemBlock := nil;
FPreviousMemBlock := nil;
Self.CheckMem;
OwnerList.CheckMem;
OwnerThreadId := MaxInt;
pOwnerList := Self.OwnerList;
{$ENDIF}
FMemoryArray := nil;
OwnerList := nil;
OwnerManager := nil;
//release medium block
Scale_FreeMem(@Self);
{$IFDEF SCALEMM_DEBUG}
pOwnerList.CheckMem;
{$ENDIF}
end;
procedure TSmallMemBlock.FreeMem(aMemoryItem: PSmallMemHeader);
{$IFDEF SCALEMM_DEBUG}
var ol: PSmallMemBlockList;
{$ENDIF}
begin
{$IFDEF SCALEMM_MAGICTEST}
Assert(aMemoryItem.Magic1 = 1234567890); //must be in use!
{$ENDIF}
{$IFDEF SCALEMM_DEBUG}
aMemoryItem.CheckMem;
CheckMem;
OwnerList.CheckMem;
{$ENDIF}
//check double free
if (aMemoryItem.Size and 1 <> 0) then
Error(reInvalidPtr);
// free mem block
FFreedArray[FFreedIndex] := aMemoryItem;
inc(FFreedIndex);
if FFreedIndex > High(FFreedArray) then
Error(reInvalidPtr);
{$IFDEF SCALEMM_DEBUG}
aMemoryItem.CheckMem;
CheckMem;
OwnerList.CheckMem;
ol := OwnerList;
{$ENDIF}
// first free item of block?
// then we add this block to (linked) list with available mem
if FFreedIndex = 1 then
begin
if OwnerList.OwnerManager.OwnerThread.FThreadId <= 1 then Exit;
{$IFDEF SCALEMM_DEBUG}
Assert(Self.OwnerThreadId = GetCurrentThreadId);
{$ENDIF}
if ({self}FNextFreedMemBlock = nil) and //not already in free list?
({self}FPreviousFreedMemBlock = nil) then
with OwnerList^ do //faster
if {Owner}FFirstFreedMemBlock <> @Self then
begin
Assert(FNextFreedMemBlock = nil);
Assert(FPreviousFreedMemBlock = nil);
{Self.}FNextFreedMemBlock := {Owner}FFirstFreedMemBlock; //link to first list
{Self.}FPreviousFreedMemBlock := nil;
if {Self}FNextFreedMemBlock <> nil then
{Self}FNextFreedMemBlock.FPreviousFreedMemBlock := @Self; //back link
{Owner}FFirstFreedMemBlock := @Self; //replace first list
end;
end
else
// all memory available?
if (FFreedIndex = C_ARRAYSIZE) and (FLock = 0) then
FreeBlockMemory;
{$IFDEF SCALEMM_DEBUG}
ol.CheckMem;
{$ENDIF}
end;
function TSmallMemBlock.GetUsedMemoryItem: PSmallMemHeader;
begin
{$IFDEF SCALEMM_DEBUG}
Self.CheckMem;
OwnerList.CheckMem;
Assert(Self.OwnerThreadId = GetCurrentThreadId);
{$ENDIF}
if FFreedIndex > 0 then //free items left?
begin
dec(FFreedIndex);
Result := FFreedArray[FFreedIndex];
if (FFreedIndex = 0) and //no free items left?
(FUsageCount >= C_ARRAYSIZE) then //and fully used?
begin
Assert(OwnerList.FFirstFreedMemBlock = @Self);
// set next free memlist
OwnerList.FFirstFreedMemBlock := {Self.}FNextFreedMemBlock;
// first one has no previous
if {Self.}FNextFreedMemBlock <> nil then
{Self.}FNextFreedMemBlock.FPreviousFreedMemBlock := nil;
// remove from free list
{Self.}FPreviousFreedMemBlock := nil;
{Self.}FNextFreedMemBlock := nil;
end;
end
else //otherwise use remaining unused mem
begin
Assert(FUsageCount < C_ARRAYSIZE);
Result := Pointer( NativeUInt(FMemoryArray) +
(FUsageCount * (OwnerList.FItemSize + SizeOf(TSmallMemHeader))) );
inc(FUsageCount);
Result.OwnerBlock := @Self;
Result.Size := OwnerList.FItemSize;
{$IFDEF SCALEMM_MAGICTEST}
Result.Magic1 := 1234567890;
Result.Magic2 := 1122334455;
{$ENDIF}
if (FUsageCount >= C_ARRAYSIZE) and //fully used?
(FFreedIndex = 0) then //no free items left?
begin
Assert(OwnerList.FFirstFreedMemBlock = @Self);
// set next free memlist
OwnerList.FFirstFreedMemBlock := {Self.}FNextFreedMemBlock;
// first one has no previous
if {Self.}FNextFreedMemBlock <> nil then
{Self.}FNextFreedMemBlock.FPreviousFreedMemBlock := nil;
// remove from free list
{Self.}FPreviousFreedMemBlock := nil;
{Self.}FNextFreedMemBlock := nil;
end;
end;
{$IFDEF SCALEMM_DEBUG}
Result.CheckMem;
Self.CheckMem;
OwnerList.CheckMem;
{$ENDIF}
end;
function TSmallMemBlock.IsFree: Boolean;
begin
Result := (FFreedIndex = C_ARRAYSIZE);
end;
procedure TSmallMemBlock.Lock;
begin
while not CAS32(0, 1, @FLock) do
Sleep(0);
end;
procedure TSmallMemBlock.UnLock;
begin
Assert(FLock = 1);
FLock := 0;
end;
(*
procedure TSmallMemBlock.UnLock;
begin
Assert(FThreadFreedCount < 0);
//unlock
//if not CAS32(FThreadFreedCount, Abs(FThreadFreedCount+1), @FThreadFreedCount) then
// Assert(False);
FThreadFreedCount := Abs(FThreadFreedCount+1);
end;
*)
(*
procedure TSmallMemBlock.Lock;
var
iCount, iNewCount: Integer;
begin
//unlock
repeat
iCount := FThreadFreedCount;
iNewCount := (iCount + 1) * -1;
if (iCount >= 0) and
CAS32(iCount, iNewCount, @FThreadFreedCount)
then
Break;
//small wait: try to swith to other pending thread (if any) else direct continue
if not SwitchToThread then
sleep(0);
//try again
iCount := FThreadFreedCount;
iNewCount := (iCount + 1) * -1;
if (iCount >= 0) and
CAS32(iCount, iNewCount, @FThreadFreedCount)
then
Break;
//wait some longer: force swith to any other thread
sleep(1);
until False;
end;
*)
procedure TSmallMemBlock.ThreadFreeMem(aMemoryItem: PSmallMemHeader);
var
fb : PSmallMemBlock;
cnt, cnt2: NativeInt;
fh : PSmallMemHeaderFree;
ref1, ref2: TSplitRecord;
{$IFDEF SCALEMM_FILLFREEMEM}
temppointer: Pointer;
ol: PSmallMemBlockList;
{$ENDIF}
begin
{$IFDEF SCALEMM_MAGICTEST}
Assert(aMemoryItem.Magic1 = 1234567890); //must be in use!
{$ENDIF}
Lock;
{$IFDEF SCALEMM_FILLFREEMEM}
//reset old mem
temppointer := Pointer(NativeUInt(aMemoryItem) + SizeOf(TSmallMemHeader)); //do no reset header
ol := OwnerList;
if NativeUInt(ol) > 10 then //can be changed in other thread?
FillChar( temppointer^, ol.FItemSize, $80)
else
FillChar( temppointer^, 32, $80);
{$ENDIF}
//repeat
fh := FFirstThreadFreed;
ref1 := FLockReference;
{$IFDEF Align8Bytes}
Assert( NativeUInt(@Self.FFirstThreadFreed) AND 7 = 0);
{$ENDIF}
{$IFDEF Align16Bytes} //$1387B38
Assert( NativeUInt(@Self.FFirstThreadFreed) AND 15 = 0);
{$ENDIF}
if ref1.DummyRef >= 1 shl 14 then //Int16(UInt16(-1)) then
ref2.DummyRef := 0
else
ref2.DummyRef := ref1.DummyRef+1; //change something for CAS
ref2.Counter := ref1.Counter+1; //increase number of free items
PSmallMemHeaderFree(aMemoryItem).NextFreeItem := fh;
FLockReference := ref2;
FFirstThreadFreed := PSmallMemHeaderFree(aMemoryItem);
//until CAS(fh, ref1.CompleteRef,
// PSmallMemHeaderFree(aMemoryItem), ref2.CompleteRef,
// Self.FFirstThreadFreed);
//some pending? then notify master thread object
//if ref2.Counter = 1 then
if ref2.Counter = 4 then
begin
if NativeUInt(Self.OwnerManager) > 2 then //not global manager
begin
repeat
{$IFDEF Align8Bytes}
Assert( NativeUInt(@Self.OwnerManager.FFirstThreadFreeBlock) AND 7 = 0);
{$ENDIF}
{$IFDEF Align16Bytes}
Assert( NativeUInt(@Self.OwnerManager.FFirstThreadFreeBlock) AND 15 = 0);
{$ENDIF}
fb := Self.OwnerManager.FFirstThreadFreeBlock;
cnt := Self.OwnerManager.FDummyCounter;
Self.FNextThreadFreedBlock := fb;
cnt2 := cnt+1;
//if NativeUInt(Self.OwnerManager) <= 2 then Break; //not global manager
until CAS(fb, cnt, @Self, cnt2, Self.OwnerManager.FFirstThreadFreeBlock);
if Self.OwnerManager.OwnerThread.FThreadTerminated then
GlobalManager.IncSmallInterthreadMem;
end;
end;
Unlock;
end;
{ TSmallMemBlockList }
procedure TSmallMemBlockList.AddNewMemoryBlock;
var
pm: PSmallMemBlock;
begin
{$IFDEF SCALEMM_DEBUG}
Self.CheckMem;
{$ENDIF}
Assert(Self.OwnerManager.OwnerThread.FThreadId = GetCurrentThreadId);
FRecursive := True;
// get block from cache
pm := GlobalManager.GetSmallBlockMemory(FItemSize);
if pm = nil then
begin
// create own one
pm := PThreadMemManager(OwnerManager.OwnerThread).FMediumMemManager
.GetMem( GetBlockSize );
// with pm^ do // put zero only to needed properties
// begin
// fillchar(FNextFreedMemBlock,SizeOf(FNextFreedMemBlock)+
// SizeOf(FPreviousFreedMemBlock)+SizeOf(FUsageCount)+
// SizeOf({$ifdef USEBITMAP}FFreed{$else}FFreedIndex{$endif}),0);
fillchar(pm^, SizeOf(pm^), 0);
pm.FMemoryArray := Pointer(NativeUInt(pm) + SizeOf(pm^));
{$IFDEF Align8Bytes}
Assert( NativeUInt(pm) AND 7 = 0);
Assert( NativeUInt(pm.FMemoryArray) AND 7 = 0);
{$ENDIF}
{$IFDEF Align16Bytes}
Assert( NativeUInt(pm) AND 15 = 0);
Assert( NativeUInt(pm.FMemoryArray) AND 15 = 0);
{$ENDIF}
{$IFDEF SCALEMM_DEBUG}
pm.OwnerList := Pointer(1);
pm.OwnerManager := Pointer(2);
pm.OwnerThreadId := 2;
{$ENDIF}
end;
{$IFDEF SCALEMM_DEBUG}
Self.CheckMem;
{$ENDIF}
// init
with pm^ do
begin
pm.Lock;
{$IFDEF SCALEMM_DEBUG}
Assert(pm.OwnerThreadId <= 2);
Assert(pm.OwnerManager = Pointer(2));
Assert(pm.OwnerList = Pointer(1));
pm.OwnerThreadId := GetCurrentThreadId;
{$ENDIF}
pm.OwnerManager := Self.OwnerManager;
pm.OwnerList := @Self;
pm.UnLock;
// set new memlist as first, add link to current item
{pm.}FNextMemBlock := {self}FFirstMemBlock;
// back link to new first item
if {self}FFirstMemBlock <> nil then
{self}FFirstMemBlock.FPreviousMemBlock := pm;
{self}FFirstMemBlock := pm;
{pm.}FPreviousMemBlock := nil;
// if block has already some freed memory (previous used block from cache)
// then add to used list
if {pm.}FFreedIndex > 0 then
begin
{pm.}FNextFreedMemBlock := {Self}FFirstFreedMemBlock; // link to first list
{pm.}FPreviousFreedMemBlock := nil;
if {pm}FNextFreedMemBlock <> nil then
{pm}FNextFreedMemBlock.FPreviousFreedMemBlock := pm; // back link
{Self}FFirstFreedMemBlock := pm; // replace first list
end
else
begin
FNextFreedMemBlock := nil;
FPreviousFreedMemBlock := nil;
end;
end;
FRecursive := False;
{$IFDEF SCALEMM_DEBUG}
pm.CheckMem;
Self.CheckMem;
{$ENDIF}
end;
procedure TSmallMemBlockList.CheckMem;
begin
if FFirstMemBlock <> nil then
begin
Assert(FFirstMemBlock.FPreviousMemBlock = nil);
FFirstMemBlock.CheckMem;
Assert(FFirstMemBlock.OwnerList <> nil);
Assert(FFirstMemBlock.OwnerList = @Self);
end;
if FFirstFreedMemBlock <> nil then
begin
Assert(FFirstFreedMemBlock.FPreviousFreedMemBlock = nil);
if OwnerManager.OwnerThread.FThreadId > 1 then
FFirstFreedMemBlock.CheckMem;
Assert(FFirstFreedMemBlock.OwnerList <> nil);
Assert(FFirstFreedMemBlock.OwnerList = @Self);
end;
Assert(OwnerManager <> nil);
Assert(OwnerManager.OwnerThread <> nil);
//Assert(not OwnerManager.OwnerThread.FThreadTerminated); can occur when thread is freed (TThreadMemManager.ProcessFreedMemFromOtherThreads)
if OwnerManager.OwnerThread.FThreadId = 1 then
begin
//is global mem
end
else
Assert(OwnerManager.OwnerThread.FThreadId = GetCurrentThreadId);
end;
procedure TSmallMemBlockList.DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PSmallMemBlockListStats);
var next: PSmallMemBlock;
begin
WriteToFile(aFile, '- SmallBlockList @ ');
WriteNativeUIntToHexBuf(aFile, NativeUInt(@Self));
WriteToFile(aFile, ', itemsize = ');
WriteNativeUIntToStrBuf(aFile, Self.FItemSize);
WriteToFile(aFile, ', memsize = ');
WriteNativeUIntToStrBuf(aFile, Self.GetBlockSize);
WriteToFile(aFile, #13#10);
aTotalStats.ItemSize := FItemSize;
aSingleStats.ItemSize := FItemSize;
aSingleStats.ArrayBlockSize := GetBlockSize;
aSingleStats.ArrayBlockSize := GetBlockSize;
next := FFirstMemBlock;
while next <> nil do
begin
next.DumpToFile(aFile, aTotalStats, aSingleStats);
next := next.FNextMemBlock;
end;
end;
function TSmallMemBlockList.GetBlockSize: Integer;
begin
Result := SizeOf(TSmallMemBlock) +
(FItemSize + SizeOf(TSmallMemHeader) + 1) * C_ARRAYSIZE;
end;
function TSmallMemBlockList.GetMemFromNewBlock: Pointer;
var
pm: PSmallMemBlock;
begin
// store: first time init?
if FFirstMemBlock = nil then
AddNewMemoryBlock;
pm := FFirstMemBlock;
while (pm.FUsageCount >= C_ARRAYSIZE) and
(pm.FFreedIndex = 0) do //otherwise "pm.GetUsedMemoryItem" will fail
begin
AddNewMemoryBlock;
pm := FFirstMemBlock;
end;
// get mem from list
with pm^ do
begin
// space left?
if FUsageCount < C_ARRAYSIZE then
begin
// calc next item
//Result := FMemoryArray;
//FMemoryArray := Pointer( NativeUInt(FMemoryArray) +
// (FItemSize + SizeOf(TSmallMemHeader)) );
//calculate by multiply to reduce cache writes?
Result := Pointer( NativeUInt(FMemoryArray) +
(FUsageCount * (FItemSize + SizeOf(TSmallMemHeader))) );
inc(FUsageCount);
// startheader = link to memlist
PSmallMemHeader(Result).OwnerBlock := pm;
PSmallMemHeader(Result).Size := FItemSize;
end
else
Result := pm.GetUsedMemoryItem;
end;
{$IFDEF SCALEMM_MAGICTEST}
TSmallMemHeader(Result^).Magic1 := 1234567890;
TSmallMemHeader(Result^).Magic2 := 1122334455;
{$ENDIF}
{$IFDEF SCALEMM_DEBUG}
TSmallMemHeader(Result^).CheckMem;
Self.CheckMem;
{$ENDIF}
Result := Pointer(NativeUInt(Result) + SizeOf(TSmallMemHeader));
end;
{ TSmallMemThreadManager }
procedure TSmallMemThreadManager.CheckAllMem;
var
i: Integer;
begin
for i := Low(Self.FMiniMemoryBlocks) to High(Self.FMiniMemoryBlocks) do
FMiniMemoryBlocks[i].CheckMem;
for i := Low(Self.FSmallMemoryBlocks) to High(Self.FSmallMemoryBlocks) do
FSmallMemoryBlocks[i].CheckMem;
end;
procedure TSmallMemThreadManager.CheckMem(aMemory: Pointer);
var
ph: PSmallMemHeader;
begin
Assert(Self.OwnerThread.FThreadId = GetCurrentThreadId);
ph := PSmallMemHeader(NativeUInt(aMemory) - SizeOf(TSmallMemHeader));
ph.CheckMem;
Assert(ph.OwnerBlock <> nil);
ph.OwnerBlock.CheckMem(sdBoth);
end;
procedure TSmallMemThreadManager.DumpToFile(aFile: THandle; aTotalStats, aSingleStats: PThreadMemManagerStats);
var
i: Integer;
begin
WriteToFile(aFile, 'TSmallMemThreadManager'#13#10);
for i := Low(Self.FMiniMemoryBlocks) to High(Self.FMiniMemoryBlocks) do
FMiniMemoryBlocks[i].DumpToFile(aFile,
@aTotalStats.SmallMemoryStats.FMiniMemoryBlocks[i],
@aSingleStats.SmallMemoryStats.FMiniMemoryBlocks[i]);
for i := Low(Self.FSmallMemoryBlocks) to High(Self.FSmallMemoryBlocks) do
FSmallMemoryBlocks[i].DumpToFile(aFile,
@aTotalStats.SmallMemoryStats.FSmallMemoryBlocks[i],
@aSingleStats.SmallMemoryStats.FSmallMemoryBlocks[i]);
end;
function TSmallMemThreadManager.FreeMem(aMemory: Pointer; aRecursive: Boolean): NativeInt;
var
ph: PSmallMemHeader;
begin
if not aRecursive and (FFirstThreadFreeBlock <> nil) then
FreeThreadFreedMem;
{$ifdef SCALEMM_DEBUG} Result := 0; try {$ENDIF}
ph := PSmallMemHeader(NativeUInt(aMemory) - SizeOf(TSmallMemHeader));
{$IFDEF SCALEMM_MAGICTEST}
Assert(ph.Magic1 = 1234567890); //must be in use!
{$ENDIF}
{$IFDEF SCALEMM_DEBUG}
ph.CheckMem;
{$ENDIF}
//check double free
if (ph.Size and 1 <> 0) then
Error(reInvalidPtr);
// block obtained via Scale_GetMem()
Assert(ph.OwnerBlock <> nil);
ph.OwnerBlock.FreeMem(ph);
Result := 0;
{$ifdef SCALEMM_DEBUG} except sleep(0); end; {$ENDIF}
end;
procedure TSmallMemThreadManager.FreeThreadFreedMem;
var
//fb : PSmallMemBlock;
ob: PSmallMemBlock;
freeblock, nextblock, nextblock2: PSmallMemBlock;
pfreemem, nextmem, nextmem2: PSmallMemHeaderFree;
p:pointer;
cnt, cnt2: NativeInt;
ref1, ref2: TSplitRecord;
begin
if FFirstThreadFreeBlock = nil then Exit;
//get linked list of blocks with free memory
//Lock;
repeat
freeblock := FFirstThreadFreeBlock;
cnt := FDummyCounter;
if cnt >= 1 shl 30 then
cnt2 := 0
else
cnt2 := cnt+1;
{$IFDEF Align8Bytes}
Assert( NativeUInt(@FFirstThreadFreeBlock) AND 7 = 0);
{$ENDIF}
{$IFDEF Align16Bytes}
Assert( NativeUInt(@FFirstThreadFreeBlock) AND 15 = 0);
{$ENDIF}
until CAS(freeblock, cnt, nil, cnt2, FFirstThreadFreeBlock); //threadsafe replace FFirstThreadFreeBlock with nil
//FFirstThreadFreeBlock := nil;
//UnLock;