＝＝＝＝＝＝＝＝＝＝＝＝＝＝关于多线程使用的几个问题＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

[studyvc6]

1、在C＋＋builder中，线程使用thread object，还是_beginthread,还是使用createthread函数比较好？这几个有什么优劣？应该如何选择呢？
估计很多人会回答使用第一个，因为是cb特意提供的。但是从方便性上来讲，没有_beginthread方便，从功能强弱上来讲，又不如createthread。

2、有关消费者和生产者线程同步的例子，谁能给我讲清楚一下，最好有源码。
题目：有m个生产者，k个缓冲池，n个消费者，每次生产或消费的大小都是一个缓冲池的大小，开始时缓冲池都为空。写一个生产者消费者线程同步的例子。

3、很想学东西，所以倾尽所有的分，不够的话请包涵，望高手讲解详细一些！

[leonatcs]

1.TThread是面向对象的，vcl里的类，_beginthread是c runtime library里的，windows平台上c语言最终还是要调用CreateThread实现。CreateThread是Windows API。要说用哪个我觉得看线程的功能复杂与否了，复杂的线程用TThread，简单的用剩下两个。
2.看源码不如看伪码，找本操作系统的书看看就清楚了。
3.分不少了:)

[wz]

这种生产消费问题教科书上都有：
//---------------------------------------------------------------------------

#include <vcl.h>
#include <syncobjs.hpp>
#pragma hdrstop

#include "Unit2.h"

#pragma package(smart_init)

TEvent * BeginProduce=new TEvent(NULL,false,true,"TestEvent1");
TEvent * BeginConsume=new TEvent(NULL,false,false,"TestEvent2");
TCriticalSection * ProduceGuard=new TCriticalSection;
int Product;
bool HasProduct;

__fastcall TProducerThread::TProducerThread(bool CreateSuspended,TEdit * AEdit)
: TThread(CreateSuspended)
{
edResult=AEdit;
}
//---------------------------------------------------------------------------
void __fastcall TProducerThread::Execute()
{
int i=0;
while(i<100)
{
BeginProduce->WaitFor(INFINITE);
ProduceGuard->Acquire();
if(!HasProduct)
{
HasProduct=true;
Product=i;
i++;
strResult=IntToStr(i);
Synchronize(ShowResult);
BeginConsume->SetEvent();
Sleep(100);
}
ProduceGuard->Release();
}
}
//---------------------------------------------------------------------------
void __fastcall TProducerThread::ShowResult()
{
edResult->Text=strResult;
}
//---------------------------------------------------------------------------

__fastcall TCustomerThread::TCustomerThread(bool CreateSuspended,TComboBox * AComboBox)
: TThread(CreateSuspended)
{
cbResult=AComboBox;
}
//---------------------------------------------------------------------------
void __fastcall TCustomerThread::Execute()
{
for(int i=0;i<200;i++)
{
BeginConsume->WaitFor(INFINITE);
strResult=IntToStr(Product);
Synchronize(ShowResult);
HasProduct=false;
Sleep(150);
BeginProduce->SetEvent();
}
}
//---------------------------------------------------------------------------
void __fastcall TCustomerThread::ShowResult()
{
cbResult->Items->Add(strResult);
}
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
thread1=new TProducerThread(true,Edit1);
thread2=new TProducerThread(true,Edit2);
thread3=new TCustomerThread(true,ComboBox1);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
thread1->Resume();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
thread2->Resume();
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button3Click(TObject *Sender)
{
thread3->Resume();
}
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include <vcl.h>
#include <syncobjs.hpp>
#pragma hdrstop
#include "Unit2.h"
#pragma package(smart_init)

TEvent * BeginProduce=new TEvent(NULL,false,true,"TestEvent1");
TEvent * BeginConsume=new TEvent(NULL,false,false,"TestEvent2");
TCriticalSection * ProduceGuard=new TCriticalSection;
int Product;
bool HasProduct;

__fastcall TProducerThread::TProducerThread(bool CreateSuspended,TEdit * AEdit)
: TThread(CreateSuspended)
{
edResult=AEdit;
}
//---------------------------------------------------------------------------
void __fastcall TProducerThread::Execute()
{
int i=0;
while(i<100)
{
BeginProduce->WaitFor(INFINITE);
ProduceGuard->Acquire();
if(!HasProduct)
{
HasProduct=true;
Product=i;
i++;
strResult=IntToStr(i);
Synchronize(ShowResult);
BeginConsume->SetEvent();
Sleep(100);
}
ProduceGuard->Release();
}
}
//---------------------------------------------------------------------------
void __fastcall TProducerThread::ShowResult()
{
edResult->Text=strResult;
}
//---------------------------------------------------------------------------

__fastcall TCustomerThread::TCustomerThread(bool CreateSuspended,TComboBox * AComboBox)
: TThread(CreateSuspended)
{
cbResult=AComboBox;
}
//---------------------------------------------------------------------------
void __fastcall TCustomerThread::Execute()
{
for(int i=0;i<200;i++)
{
BeginConsume->WaitFor(INFINITE);
strResult=IntToStr(Product);
Synchronize(ShowResult);
HasProduct=false;
Sleep(150);
BeginProduce->SetEvent();
}
}
//---------------------------------------------------------------------------
void __fastcall TCustomerThread::ShowResult()
{
cbResult->Items->Add(strResult);
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{

}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
thread1=new TProducerThread(true,Edit1);
thread2=new TProducerThread(true,Edit2);
thread3=new TCustomerThread(true,ComboBox1);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
thread1->Resume();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
thread2->Resume();
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button3Click(TObject *Sender)
{
thread3->Resume();
}
//---------------------------------------------------------------------------

[studyvc6]

两位都没有给出我需要的答案！
第一位给出的例子是一个生产者和第一个消费者的例子吧？这个源码我也有。我需要多生产者和多消费者的源码和详细讲解，想学习一下。
第二位讲的对我来说基本没什么参考，我都知道的。而且讲的似乎还不对，功能最强大的应该是createthread吧？也是最复杂的吧。期待高手以自己的实际经验讲解一下。

盼望高手继续回答

[sbkopoky]

有一个香港和悦网络电话的源文件 ,有兴趣妨进入我的BLOG看看