内存池

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/// <author>cxg 2020-8-24</author> /// 跨操作系统内存池 unit MemPool;   interface   uses   Math, Classes, SysUtils, SyncObjs;   type   TMemBlock = record     buf: Pointer;     size: Integer;   end;     pMemBlock = ^TMemBlock;     TMemPool = class   private     freelist, uselist: TList;     FBlkSize: Integer;     FBlkCnt: Integer;     FCS: TCriticalSection;     procedure Lock;     procedure UnLock;     procedure GetRes(const ABlocks: Integer);     procedure FreeRes;   public     constructor Create(const ABlocks: Integer; const ABlockSize: Integer);     destructor Destroy; override;     function GetBuf: Pointer;     procedure FreeBuf(const ABuffer: Pointer);     property BlockSize: Integer read FBlkSize;   end;   type   TMemList = class   private     FPool: TMemPool;     FList: TList;     function GetSize: integer;   public     constructor Create(const pool: TMemPool);     destructor Destroy; override;     procedure addBuf(const buf: Pointer; const len: Integer);     procedure freeList(const list: TList);     procedure list2stream(list: TList; ms: TMemoryStream);     procedure stream2list(ms: TMemoryStream; list: TList);     property list: TList read FList;   end;   implementation   { TMemPool } constructor TMemPool.Create(const ABlocks, ABlockSize: Integer); begin   FCS := TCriticalSection.Create;   FBlkCnt := ABlocks;   FBlkSize := ABlockSize;   freelist := TList.Create;   uselist := TList.Create;   GetRes(ABlocks); end;   destructor TMemPool.Destroy; begin //  FreeRes;   FreeAndNil(freelist);   FreeAndNil(uselist);   FreeAndNil(FCS);   inherited; end;   procedure TMemPool.FreeBuf(const ABuffer: Pointer); begin   Lock;   try     freelist.Add(ABuffer);     uselist.Delete(uselist.IndexOf(ABuffer));   finally     UnLock;   end; end;   procedure TMemPool.FreeRes; var   p: pMemBlock;   i: Integer; begin   for i := freelist.count-1 downto 0 do   begin     p := freelist[i];     FreeMem(p.buf);     Dispose(p);     freelist.Delete(i);   end;   for i := uselist.count-1 downto 0 do   begin     p := uselist[i];     FreeMem(p.buf);     Dispose(p);     uselist.Delete(i);   end; end;   function TMemPool.GetBuf: Pointer; begin   Lock;   try     if freelist.Count = 0 then       GetRes(100);       Result := freelist.Last;     uselist.Add(Result);     freelist.Delete(freelist.Count-1);   finally     UnLock;   end; end;   procedure TMemPool.GetRes(const ABlocks: Integer); var   i: Integer;   p: pMemBlock; begin   for i := 1 to ABlocks do   begin     New(p);     GetMem(p.buf, FBlkSize);     freelist.Add(p);   end; end;   procedure TMemPool.Lock; begin   FCS.Enter; end;   procedure TMemPool.UnLock; begin   FCS.Leave; end;   { TMemList }   procedure TMemList.addBuf(const buf: Pointer; const len: Integer); var   p: pMemBlock; begin   p := FPool.GetBuf;   p.buf := buf;   p.size := len;   FList.Add(p); end;   constructor TMemList.Create(const pool: TMemPool); begin   FPool := pool;   FList := TList.Create; end;   destructor TMemList.Destroy; begin   FreeAndNil(FList);   inherited; end;   procedure TMemList.freeList(const list: TList); var   p: pMemBlock;   i: integer; begin   for i := list.Count - 1 downto 0 do   begin     p := pmemblock(list[i]);     FPool.FreeBuf(p);     list.Delete(i);   end; end;   function TMemList.GetSize: integer; var   i: Integer; begin   i := FList.Count;   Result := FPool.FBlkSize * (i - 1) + pMemblock(FList[i - 1]).size; end;   procedure TMemList.list2stream(list: TList; ms: TMemoryStream); var   i: integer;   p: pMemBlock; begin   ms.SetSize(GetSize);   for i := 0 to list.Count - 1 do   begin     p := pmemblock(list[i]);     ms.Write(p.buf^, p.size);   end; end;   procedure TMemList.stream2list(ms: TMemoryStream; list: TList); var   p: pMemBlock;   qty, remain, n, i: Integer; begin   qty := Ceil(ms.Size / FPool.FBlkSize);   n := qty - 1;   remain := ms.Size - (n * FPool.FBlkSize);   for i := 1 to qty do   begin     p := FPool.GetBuf;     if i = qty then     begin       ms.Read(p.buf, remain);       p.size := remain;     end     else     begin       ms.Read(p.buf, FPool.FBlkSize);       p.size := FPool.FBlkSize;     end;     list.Add(p);   end; end;   end.