异步任务调度二

异步任务调度二

适用于DELPHI7及以上版本，支持跨操作系统。

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/// <author>cxg 2020-7-14</author> (*使用: unit Unit1;   interface   uses    tasks, MsgPack,   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls;   type   TForm1 = class(TForm)     Button1: TButton;     procedure Button1Click(Sender: TObject);   private     { Private declarations }     tasks: TThreadCfg;   public     { Public declarations }     procedure callback(task: TMsgPack);   end;   var   Form1: TForm1;   implementation   {$R *.dfm}   procedure TForm1.Button1Click(Sender: TObject); var task: TMsgPack;   queue: TTaskQueue; begin   task := TMsgPack.Create;   task.Force('f1').AsString := '测试';   queue := TTaskQueue.Create;   queue.enQueue(task);   tasks := TThreadCfg.Create(1, queue);   tasks.onCallback := callback;   tasks.newThreads; end;   procedure TForm1.callback(task: TMsgPack); begin   Caption := task.force('f1').AsString;   tasks.Free; end;   end. *)   unit tasks;   interface   uses   {$IFDEF mswindows}   Windows,   {$ENDIF}  MsgPack, Contnrs,   SyncObjs, Classes,   SysUtils;   type   TCallBack = procedure(task: TMsgPack) of object;   type   TTaskQueue = class   //任务队列（线程安全）   private     fQueue: TQueue;     fCS: TCriticalSection;   public     constructor Create;     destructor Destroy; override;     procedure enQueue(task: Pointer);     function deQueue: Pointer;   end;   type   TThreadCfg = class     //管理 工作线程   private     fQueue: TTaskQueue;     fCallBack: TCallBack;     fThreadNum: Integer;     fWorkers: array of TThread;   public     constructor Create(const threadNum: Integer; const queue: TTaskQueue);     destructor Destroy; override;     procedure newThreads;     property onCallback: TCallBack read fCallBack write fCallBack;   end;   type   TWorkThread = class(TThread)  //工作线程   private     fConfig: TThreadCfg;   public     constructor Create(cfg: TThreadCfg);     destructor Destroy; override;     procedure Execute; override;   end;    implementation   function GetCPUNum: Integer; {$IFDEF MSWINDOWS} var   si: SYSTEM_INFO; {$ENDIF} begin   {$IFDEF MSWINDOWS}   GetSystemInfo(si);   Result := si.dwNumberOfProcessors;   {$ELSE}// Linux,MacOS,iOS,Andriod{POSIX}   {$IFDEF POSIX}   Result := sysconf(_SC_NPROCESSORS_ONLN);   {$ELSE}// unkown system, default 1   Result := 5;   {$ENDIF POSIX}   {$ENDIF MSWINDOWS} end;   { TTaskQueue }   constructor TTaskQueue.Create; begin   fQueue := TQueue.Create;   fCS := TCriticalSection.Create; end;   function TTaskQueue.deQueue: Pointer; begin   fCS.Enter;   Result := fQueue.Pop;   fCS.Leave; end;   destructor TTaskQueue.Destroy; begin   FreeAndNil(fQueue);   FreeAndNil(fCS);   inherited; end;   procedure TTaskQueue.enQueue(task: Pointer); begin   fCS.Enter;   fQueue.Push(task);   fCS.Leave; end;   { TThreadCfg }   constructor TThreadCfg.Create(const threadNum: Integer;   const queue: TTaskQueue); begin   fThreadNum := threadNum;   fQueue := queue;   if fThreadNum = 0 then     fThreadNum := GetCPUNum;   SetLength(fWorkers, fThreadNum); end;   destructor TThreadCfg.Destroy; var i: Integer; begin   for i := 0 to fThreadNum - 1 do  //停止并释放工作线程   begin     fWorkers[i].Terminate;     fWorkers[i].WaitFor;     fWorkers[i].Free;   end;   fQueue.Free;       //释放队列   inherited; end;   procedure TThreadCfg.newThreads; var i: Integer; begin   for i := 0 to fThreadNum - 1 do   begin     fWorkers[i] := TWorkThread.Create(Self);     fWorkers[i].Resume;   end; end;   { TWorkThread }   constructor TWorkThread.Create(cfg: TThreadCfg); begin   inherited Create(True);   FreeOnTerminate := true;   fConfig := cfg; end;   destructor TWorkThread.Destroy; begin     inherited; end;   procedure TWorkThread.Execute; var pack: TMsgPack; begin   while not Self.Terminated do   begin     if fConfig.fQueue.fQueue.Count > 0 then     begin       pack := TMsgPack(fConfig.fQueue.deQueue);       if Assigned(fConfig.fCallBack) then       begin         fConfig.fCallBack(pack);         pack.Free;    //释放       end;     end;     Sleep(1);     {$IFDEF mswindows}     SwitchToThread;     {$ELSE}     TThread.Yield;     {$ENDIF}   end; end;   end.

{$IFDEF posix}
posix.Unistd,
{$ENDIF}