LPTHREAD

LPTHREAD指向一個函式，該函式通知宿主某個執行緒已開始執行。

基本介紹

• 中文名：LPTHREAD
• 全稱：LPTHREAD_START_ROUTINE函式指針
• 參數：[in]指向開始執行的代碼的指針
• 作用：指向一個函式

函式指針

.NET Framework 4 版 中已棄用此函式指針。

定義

typedef DWORD (__stdcall *LPTHREAD_START_ROUTINE) ( [in] LPVOID lpThreadParameter);

參數

lpThreadParameter

[in] 一個指向已經開始執行的代碼的指針。

備註

LPTHREAD_START_ROUTINE 指向的函式是回調函式，並且必須由承載應用程式的編寫器實現。

例子

API::CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)UpdateThread,(LPVOID)ThreadPara,CREATE_SUSPENDED,&ThreadId);

//開始一個計算執行緒 來創建執行緒

以下是部分代碼(在一個循環里創建執行緒):

DWORD ThreadId;

while(threadcount> =threadcounts)

{

Sleep(50);

Form1-> Edit3-> Text =AnsiString(Close_Pass);

Form1-> Label3-> Caption=IntToStr(threadcount);

Application-> ProcessMessages();

}

int t=ThreadPara-> emun_i;

strcpy(Close_Pass,ThreadPara-> emun_str[ThreadPara-> emun_i-1]);

HANDLE m_hHandle;

m_hHandle=::CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)UpdateThread,(LPVOID)ThreadPara,CREATE_SUSPENDED,&ThreadId);//開始一個計算執行緒

SetThreadPriority(m_hHandle,THREAD_PRIORITY_HIGHEST);

ResumeThread(m_hHandle);

//---------------------------------------------------------------------------

#ifndef MainH

#define MainH

//---------------------------------------------------------------------------

#include

#include

#include

#include

#include

//---------------------------------------------------------------------------

class TCPUTester:public TThread

{

private:

TSpeedButton *FButton;

void __fastcall Execute(void);

public:

__fastcall TCPUTester(TSpeedButton *Button,

bool CreateSuspended=true,

unsigned long CPUMark=1);

__fastcall ~TCPUTester(void);

};

class TForm1 : public TForm

{

__published: // IDE-managed Components

TSpeedButton *SpeedButton1;

TSpeedButton *SpeedButton2;

TSpeedButton *SpeedButton3;

TSpeedButton *SpeedButton4;

TSpeedButton *SpeedButton5;

TSpeedButton *SpeedButton6;

TSpeedButton *SpeedButton7;

TSpeedButton *SpeedButton8;

TSpeedButton *SpeedButton9;

TSpeedButton *SpeedButton10;

TSpeedButton *SpeedButton11;

TSpeedButton *SpeedButton12;

TSpeedButton *SpeedButton13;

TSpeedButton *SpeedButton14;

TSpeedButton *SpeedButton15;

TSpeedButton *SpeedButton16;

TSpeedButton *SpeedButton17;

TSpeedButton *SpeedButton18;

TSpeedButton *SpeedButton19;

TSpeedButton *SpeedButton20;

TSpeedButton *SpeedButton21;

TSpeedButton *SpeedButton22;

TSpeedButton *SpeedButton23;

TSpeedButton *SpeedButton24;

TSpeedButton *SpeedButton25;

TSpeedButton *SpeedButton26;

TSpeedButton *SpeedButton27;

TSpeedButton *SpeedButton28;

TSpeedButton *SpeedButton29;

TSpeedButton *SpeedButton30;

TSpeedButton *SpeedButton31;

TSpeedButton *SpeedButton32;

void __fastcall SpeedButton1Click(TObject *Sender);

void __fastcall FormDestroy(TObject *Sender);

private: // User declarations

public: // User declarations

__fastcall TForm1(TComponent* Owner);

};

//---------------------------------------------------------------------------

extern PACKAGE TForm1 *Form1;

//---------------------------------------------------------------------------

#endif

/************/

/* CPP單元 */

/************/

//---------------------------------------------------------------------------

#include

#pragma hdrstop

#include "Main.h "

//---------------------------------------------------------------------------

#pragma package(smart_init)

#pragma resource "*.dfm "

TForm1 *Form1;

void __fastcall TCPUTester::Execute(void)

{

while((!this-> Terminated)&&(FButton-> Down));

}

__fastcall TCPUTester::TCPUTester(TSpeedButton *Button,

bool CreateSuspended,

unsigned long CPUMark)

:FButton(Button), TThread(CreateSuspended)

{

this-> FreeOnTerminate=true;

SetThreadAffinityMask ((void *)this-> Handle,1 < <(CPUMark-1));

}

__fastcall TCPUTester::~TCPUTester(void)

{

FButton=NULL;

}

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

: TForm(Owner)

{

DWORD ProcessAffinityMask;

DWORD SystemAffinityMask;

if(!GetProcessAffinityMask( GetCurrentProcess(),

&ProcessAffinityMask,

&SystemAffinityMask))

{

Application-> Terminate();

}

for(int i=0;i

{

if(SystemAffinityMask&(1 <

{

dynamic_cast (FindComponent( "SpeedButton "+IntToStr(i+1)))-> Enabled=true;

}

}

}

//---------------------------------------------------------------------------

void __fastcall TForm1::SpeedButton1Click(TObject *Sender)

{

if(!Sender-> InheritsFrom(__classid(TSpeedButton)))

{

return;

}

TSpeedButton *Button=dynamic_cast (Sender);

if(NULL==Button)

return;

if(!Button-> Down)

{

return;

}

TCPUTester *CPUTester=new TCPUTester(Button,true,StrToInt(Button-> Caption));

if(NULL==CPUTester)

{

return;

}

CPUTester-> Resume();

}

//---------------------------------------------------------------------------

void __fastcall TForm1::FormDestroy(TObject *Sender)

{

for(int i=0;i

{

TComponent *comp=Components[i];

if(comp-> InheritsFrom(__classid(TSpeedButton)))

dynamic_cast (comp)-> Down=false;

}

Sleep(1000);

}

//---------------------------------------------------------------------------

//TSpeedButton的Caption分別為1~32的數字。