多线程怎么重复利用？？

2013-06-06 03:01:09 432 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C++多线程教程（三）利用多线程实现加速简介在前期基础知识储备以后，让我们正式进入利用多线程实现程序加速的环节基本思想将原始计算过程拆分为多个过程。例如计算五亿次加法过程。我们可以将其分为两个过程，从零加到两万五，再从两万五加到五万。程序实现下面的程序分别展示用两个线程和单个线程实现五亿次加法过程。measure测量时间函数已经在上一章节中详述，不再重复。 int main() { long times = 50000000... 阅读详情

要写200个数据我分成两个线程去写不过领导说要按照另一种思路写：还是两个线程，一个线程只处理10个数据谁先处理完谁继续再去处理接下的10个数据，直到所有数据处理完，我不知道怎么写求指点





  #include <Windows.h>  

  #include <iostream>  

  using namespace std;  



  DWORD WINAPI Thread1(LPVOID lpParmeter);  

  DWORD WINAPI Thread2(LPVOID lpParmeter);  



  int main()  

  {  

      HANDLE hThread1 ;  

      HANDLE hThread2 ;  

     

      

      hThread1 = CreateThread(NULL, 0, Thread1, NULL, 0, NULL);  

      hThread2 = CreateThread(NULL, 0, Thread2, NULL, 0, NULL);  



      HANDLE h[2]={hThread1,hThread2};

      WaitForMultipleObjects(2,h,true, INFINITE);//等待所有线程完成后，退出

  

      CloseHandle(hThread1);  

      CloseHandle(hThread2);  

          

      system("PAUSE");  

      return 0;  

  }  

  DWORD WINAPI Thread1(LPVOID lpParmeter)  

  {  

     

	  //1到100的处理过程

	  for each 1 to 100

		  deal(...);



      return 0;  

  }  

  DWORD WINAPI Thread2(LPVOID lpParameter)//thread data  

  {  

	  //100到200的处理过程

	  for each 100 to 200

          deal(...);



      return 0;  

  }

这是我现在写的思路

...全文

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切换为时间正序

有新工作否 2013-06-08

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还是必须要用临界区，不然会丢失一些数据，新代码如下


#include <Windows.h>  
#include <iostream>  
#include <fstream>
using namespace std;  
  

  struct Numbers
  {
	  int number;
	  bool IsDoing;
	  bool HaveDone;
  };
  
  Numbers NumbersArray[20000];

  DWORD WINAPI Thread1(Numbers* pNumbers1);  
  DWORD WINAPI Thread2(Numbers* pNumbers2);  
  
  CRITICAL_SECTION g_CriticalSection; 

  int main()  
  {  
      
      

	  //为numbers赋值
	  for(int i = 1;i<=20000;i++)
	  {
		  NumbersArray[i].number = i;
		  NumbersArray[i].IsDoing = false;
		  NumbersArray[i].HaveDone = false;
	  }

	  HANDLE hThread1 ;  
      HANDLE hThread2 ;  

	  Numbers* pNumbers1 = NumbersArray;
	  Numbers* pNumbers2 = NumbersArray;
       
	  InitializeCriticalSection(&g_CriticalSection);      // 初始化 

      hThread1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Thread1, pNumbers1, 0, NULL);  
      hThread2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Thread2, pNumbers2, 0, NULL);  
 
      HANDLE h[2]={hThread1,hThread2};
      WaitForMultipleObjects(2,h,true, INFINITE);
   
      CloseHandle(hThread1);  
      CloseHandle(hThread2);  
           
	  DeleteCriticalSection(&g_CriticalSection);          // 删除 

      system("PAUSE");  
      return 0;  
  }  
  DWORD WINAPI Thread1(Numbers* pNumbers1)  
  {  
	  
	  while(pNumbers1->number < 20000)
	  {   

		  EnterCriticalSection(&g_CriticalSection); //进入临界区

		  ofstream file1("123.txt",ofstream::app);
		  if(pNumbers1->IsDoing == false && pNumbers1->HaveDone == false)
		  {
			  pNumbers1->IsDoing = true;
			  for(int i =0;i<10;i++)
			  {
				  file1<<"Thread1 deal with"<<(pNumbers1+i)->number<<endl;
				  //Sleep(10);
			  }
			  pNumbers1->HaveDone = true;
		  }
		  else
			  pNumbers1+=10;
		  file1.close();

		  LeaveCriticalSection(&g_CriticalSection);   
		  
	  }
	  
     
 
      return 0;  
  }  

  DWORD WINAPI Thread2(Numbers* pNumbers2) 
  {  
	  
      while(pNumbers2->number < 20000)
	  {
		  EnterCriticalSection(&g_CriticalSection); //进入临界区
		  
		  ofstream file2("123.txt",ofstream::app);
		  if(pNumbers2->IsDoing == false && pNumbers2->HaveDone == false)
		  {
			  
			  pNumbers2->IsDoing = true;
			  for(int i =0;i<10;i++)
			  {
			      file2<<"Thread2 deal with"<<(pNumbers2+i)->number<<endl;
				  //Sleep(10);
			  }
			  pNumbers2->HaveDone = true;
		  }
		  else
			  pNumbers2+=10;	 

		  file2.close();

		  LeaveCriticalSection(&g_CriticalSection);
	  }

	  
      return 0;  
  }

有新工作否 2013-06-08

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运行的时间比较长，为了压力测试一下，会不会造成数据冲突。如果楼主不想测试，直接把Sleep(10)去掉。大概需要200多秒才运行好。

有新工作否 2013-06-08

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楼主的毅力我很佩服，一个帖子不成还开一个帖子。。那天我就说了楼主了，你这样的效率很低的，还不如开始就分配好内存，让2个线程直接去取数据，不要这样动态。不过楼主的毅力很不错，我写了个2线程取数据的，楼主测试看看吧。


#include <Windows.h>  
#include <iostream>  
#include <fstream>
using namespace std;  
  

  struct Numbers
  {
	  int number;
	  bool IsDoing;
	  bool HaveDone;
  };
  
  Numbers NumbersArray[20000];

  DWORD WINAPI Thread1(Numbers* pNumbers1);  
  DWORD WINAPI Thread2(Numbers* pNumbers2);  
  
  int main()  
  {  
      HANDLE hThread1 ;  
      HANDLE hThread2 ;  
      

	  //为numbers赋值
	  for(int i = 1;i<=20000;i++)
	  {
		  NumbersArray[i].number = i;
		  NumbersArray[i].IsDoing = false;
		  NumbersArray[i].HaveDone = false;
	  }

	  Numbers* pNumbers1 = NumbersArray;
	  Numbers* pNumbers2 = NumbersArray;
       
      hThread1 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Thread1, pNumbers1, 0, NULL);  
      hThread2 = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Thread2, pNumbers2, 0, NULL);  
 
      HANDLE h[2]={hThread1,hThread2};
      WaitForMultipleObjects(2,h,true, INFINITE);
   
      CloseHandle(hThread1);  
      CloseHandle(hThread2);  
           
      system("PAUSE");  
      return 0;  
  }  
  DWORD WINAPI Thread1(Numbers* pNumbers1)  
  {  
	  while(pNumbers1->number < 20000)
	  {   
		  ofstream file1("123.txt",ofstream::app);
		  if(pNumbers1->IsDoing == false && pNumbers1->HaveDone == false)
		  {
			  pNumbers1->IsDoing = true;
			  for(int i =0;i<10;i++)
			  {
				  file1<<"Thread1 deal with"<<(pNumbers1+i)->number<<endl;
				  Sleep(10);
			  }
			  pNumbers1->HaveDone = true;
		  }
		  else
			  pNumbers1+=10;

		  file1.close();
	  }
     
 
      return 0;  
  }  

  DWORD WINAPI Thread2(Numbers* pNumbers2) 
  {  
      while(pNumbers2->number < 20000)
	  {
		  ofstream file2("123.txt",ofstream::app);

		  if(pNumbers2->IsDoing == false && pNumbers2->HaveDone == false)
		  {
			  
			  pNumbers2->IsDoing = true;
			  for(int i =0;i<10;i++)
			  {
			      file2<<"Thread2 deal with"<<(pNumbers2+i)->number<<endl;
				  Sleep(10);
			  }
			  pNumbers2->HaveDone = true;
		  }
		  else
			  pNumbers2+=10;

		  file2.close();
	  }
      return 0;  
  }

lm_whales 2013-06-08

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#include<stdlib.h>
#include <time.h>
#include <Windows.h>     
#include <iostream>   
  
using namespace std; 
//DWORD WINAPI Thread1(LPVOID lpParmeter);
//DWORD WINAPI Thread2(LPVOID lpParmeter);     
//假设数据类型为 int； 
typedef int datatype; 

struct taskParam{
    int buf[1000];
    int sleep[100];
    int curpos; 
    CRITICAL_SECTION  cs;   
    };

struct ThreadParam{
    int no;
    int len;
    int start;
    taskParam *ptask;
};    

void InitTask(taskParam &task){
    task.curpos=0;
    for(int i=0;i<100;i++)
    task.buf[i]=i; 
    srand(time(NULL));//方便下面的模拟操作 
    
    InitializeCriticalSection(&task.cs);
}

void FinshedTask(taskParam &task){
    task.curpos=0;
    DeleteCriticalSection(&task.cs);
}

void PrintMsg(ThreadParam *pParam,char *msg){ 
    EnterCriticalSection(&pParam->ptask->cs); 
    cout<<msg<<": Thread "<<pParam->no <<endl;
    cout<<" pos =" << pParam->start<<",length= "<<pParam->len<<endl; 
    LeaveCriticalSection(&pParam->ptask->cs);     
}

int getTask(ThreadParam *pParam){
    int pos=1000;
    int ret=0;
    EnterCriticalSection(&pParam->ptask->cs); 
    pos =pParam->ptask->curpos;
    if(pos<1000){
        pParam->start =pos;
        pParam->len=10;
        pParam->ptask->curpos+=10;
        ret =10;
    }
    else ret =0;
    
    LeaveCriticalSection(&pParam->ptask->cs);     
   // PrintMsg(pParam,"gettask task");
    return ret; 
}  

void DealTask(ThreadParam *pParam){
    // 处理任务 
    //int n=1.0*rand()/RAND_MAX *500+10;
    char msg[1024]="deal task";
    //sprintf(msg,"deal task sleep %d",n);     
    PrintMsg(pParam, msg);
   // 这用来，模拟处理任务。 
    for (int i=pParam->start; i< pParam->start+ pParam->len;i++)
      pParam->ptask->buf[i]*=2; //假设实际这样处理 
    //Sleep(n); 
}

DWORD WINAPI ThreadProc(LPVOID lpParmeter);
int main()     {         
    HANDLE hThread1 ;         
    HANDLE hThread2 ;
    
    taskParam task;
    InitTask(task);
    
    ThreadParam param[2]={{0,0,0,&task},{1,0,0,&task}};
    
    hThread1 = CreateThread(NULL, 0, ThreadProc, param, 0, NULL);
    hThread2 = CreateThread(NULL, 0, ThreadProc, param+1, 0, NULL);
    HANDLE h[2]={hThread1,hThread2};       
    
    WaitForMultipleObjects(2,h,true, INFINITE);//等待所有线程完成后，退出           
    CloseHandle(hThread1);         
    CloseHandle(hThread2);   
    FinshedTask(task);
                                        
    system("PAUSE");         
    return 0;     
} 

    
DWORD WINAPI ThreadProc(LPVOID lpParmeter){
     ThreadParam *pParam=(ThreadParam *)lpParmeter;
     while(getTask(pParam)){    
         DealTask(pParam);   
     }
     return 0; 
}  

// DWORD WINAPI Thread2(LPVOID lpParameter)//thread data     
//{         //100到200的处理过程       
//for each 100 to 200           
//deal(...);         return 0;     
//}

lm_whales 2013-06-08

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在线程里开一循环，如果有数据要处理读取10个数据没有线程退出对取数据，进行同步就可以了 #include<stdlib.h> #include <time.h> #include <Windows.h> #include <iostream> using namespace std; //DWORD WINAPI Thread1(LPVOID lpParmeter); //DWORD WINAPI Thread2(LPVOID lpParmeter); //假设数据类型为 int； typedef int datatype; struct taskParam{ int buf[1000]; int sleep[100]; int curpos; CRITICAL_SECTION cs; }; struct ThreadParam{ int no; int len; int start; taskParam *ptask; }; void InitTask(taskParam &task){ task.curpos=0; for(int i=0;i<100;i++) task.buf[i]=i; srand(time(NULL));//方便下面的模拟操作 InitializeCriticalSection(&task.cs); } void FinshedTask(taskParam &task){ task.curpos=0; DeleteCriticalSection(&task.cs); } void PrintMsg(ThreadParam *pParam,char *msg){ EnterCriticalSection(&pParam->ptask->cs); cout<<msg<<": Thread "<<pParam->no <<endl; cout<<" pos =" << pParam->start<<",length= "<<pParam->len<<endl; LeaveCriticalSection(&pParam->ptask->cs); } int getTask(ThreadParam *pParam){ int pos=1000; int ret=0; EnterCriticalSection(&pParam->ptask->cs); pos =pParam->ptask->curpos; if(pos<1000){ pParam->start =pos; pParam->len=10; pParam->ptask->curpos+=10; ret =10; } else ret =0; LeaveCriticalSection(&pParam->ptask->cs); // PrintMsg(pParam,"gettask task"); return ret; } void DealTask(ThreadParam *pParam){ // 处理任务 //int n=1.0*rand()/RAND_MAX *500+10; char msg[1024]="deal task"; //sprintf(msg,"deal task sleep %d",n); PrintMsg(pParam, msg); // 这用来，模拟处理任务。 for (int i=pParam->start; i< pParam->start+ pParam->len;i++) pParam->ptask->buf[i]*=2; //假设实际这样处理 //Sleep(n); } DWORD WINAPI ThreadProc(LPVOID lpParmeter); int main() { HANDLE hThread1 ; HANDLE hThread2 ; taskParam task; InitTask(task); ThreadParam param[2]={{0,0,0,&task},{1,0,0,&task}}; hThread1 = CreateThread(NULL, 0, ThreadProc, param, 0, NULL); hThread2 = CreateThread(NULL, 0, ThreadProc, param+1, 0, NULL); HANDLE h[2]={hThread1,hThread2}; WaitForMultipleObjects(2,h,true, INFINITE);//等待所有线程完成后，退出 CloseHandle(hThread1); CloseHandle(hThread2); FinshedTask(task); system("PAUSE"); return 0; } DWORD WINAPI ThreadProc(LPVOID lpParmeter){ ThreadParam *pParam=(ThreadParam *)lpParmeter; while(getTask(pParam)){ DealTask(pParam); } return 0; } // DWORD WINAPI Thread2(LPVOID lpParameter)//thread data //{ //100到200的处理过程 //for each 100 to 200 //deal(...); return 0; //}

qq120848369 2013-06-06

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条件变量+互斥锁+队列

赵4老师 2013-06-06

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//循环向a函数每次发送200个字节长度（这个是固定的）的buffer,
//a函数中需要将循环传进来的buffer，组成240字节（也是固定的）的新buffer进行处理，
//在处理的时候每次从新buffer中取两个字节打印
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <process.h>
#include <io.h>
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
static char logstr[MAXLINSIZE+1];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
void Lock(CRITICAL_SECTION *l) {
    EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
    LeaveCriticalSection(l);
}
void LogV(const char *pszFmt,va_list argp) {
    struct tm *now;
    struct timeb tb;

    if (NULL==pszFmt||0==pszFmt[0]) return;
    _vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
    ftime(&tb);
    now=localtime(&tb.time);
    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );
    sprintf(mss,"%03d",tb.millitm);
    printf("%s %s.%s %s",datestr,timestr,mss,logstr);
    flog=fopen(logfilename1,"a");
    if (NULL!=flog) {
        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
        if (ftell(flog)>MAXLOGSIZE) {
            fclose(flog);
            if (rename(logfilename1,logfilename2)) {
                remove(logfilename2);
                rename(logfilename1,logfilename2);
            }
        } else {
            fclose(flog);
        }
    }
}
void Log(const char *pszFmt,...) {
    va_list argp;

    Lock(&cs_log);
    va_start(argp,pszFmt);
    LogV(pszFmt,argp);
    va_end(argp);
    Unlock(&cs_log);
}
//Log}
#define ASIZE    200
#define BSIZE    240
#define CSIZE      2
char Abuf[ASIZE];
char Cbuf[CSIZE];
CRITICAL_SECTION cs_HEX ;
CRITICAL_SECTION cs_BBB ;
struct FIFO_BUFFER {
    int  head;
    int  tail;
    int  size;
    char data[BSIZE];
} BBB;
int No_Loop=0;
void HexDump(int cn,char *buf,int len) {
    int i,j,k;
    char binstr[80];

    Lock(&cs_HEX);
    for (i=0;i<len;i++) {
        if (0==(i%16)) {
            sprintf(binstr,"%03d %04x -",cn,i);
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        } else if (15==(i%16)) {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
            sprintf(binstr,"%s  ",binstr);
            for (j=i-15;j<=i;j++) {
                sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
            }
            Log("%s\n",binstr);
        } else {
            sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
        }
    }
    if (0!=(i%16)) {
        k=16-(i%16);
        for (j=0;j<k;j++) {
            sprintf(binstr,"%s   ",binstr);
        }
        sprintf(binstr,"%s  ",binstr);
        k=16-k;
        for (j=i-k;j<i;j++) {
            sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
        }
        Log("%s\n",binstr);
    }
    Unlock(&cs_HEX);
}
int GetFromRBuf(int cn,CRITICAL_SECTION *cs,FIFO_BUFFER *fbuf,char *buf,int len) {
    int lent,len1,len2;

    lent=0;
    Lock(cs);
    if (fbuf->size>=len) {
        lent=len;
        if (fbuf->head+lent>BSIZE) {
            len1=BSIZE-fbuf->head;
            memcpy(buf     ,fbuf->data+fbuf->head,len1);
            len2=lent-len1;
            memcpy(buf+len1,fbuf->data           ,len2);
            fbuf->head=len2;
        } else {
            memcpy(buf     ,fbuf->data+fbuf->head,lent);
            fbuf->head+=lent;
        }
        fbuf->size-=lent;
    }
    Unlock(cs);
    return lent;
}
void thdB(void *pcn) {
    char        *recv_buf;
    int          recv_nbytes;
    int          cn;
    int          wc;
    int          pb;

    cn=(int)pcn;
    Log("%03d thdB              thread begin...\n",cn);
    while (1) {
        Sleep(10);
        recv_buf=(char *)Cbuf;
        recv_nbytes=CSIZE;
        wc=0;
        while (1) {
            pb=GetFromRBuf(cn,&cs_BBB,&BBB,recv_buf,recv_nbytes);
            if (pb) {
                Log("%03d recv %d bytes\n",cn,pb);
                HexDump(cn,recv_buf,pb);
                Sleep(1);
            } else {
                Sleep(1000);
            }
            if (No_Loop) break;//
            wc++;
            if (wc>3600) Log("%03d %d==wc>3600!\n",cn,wc);
        }
        if (No_Loop) break;//
    }
}
int PutToRBuf(int cn,CRITICAL_SECTION *cs,FIFO_BUFFER *fbuf,char *buf,int len) {
    int lent,len1,len2;

    Lock(cs);
    lent=len;
    if (fbuf->size+lent>BSIZE) {
        lent=BSIZE-fbuf->size;
    }
    if (fbuf->tail+lent>BSIZE) {
        len1=BSIZE-fbuf->tail;
        memcpy(fbuf->data+fbuf->tail,buf     ,len1);
        len2=lent-len1;
        memcpy(fbuf->data           ,buf+len1,len2);
        fbuf->tail=len2;
    } else {
        memcpy(fbuf->data+fbuf->tail,buf     ,lent);
        fbuf->tail+=lent;
    }
    fbuf->size+=lent;
    Unlock(cs);
    return lent;
}
void thdA(void *pcn) {
    char        *send_buf;
    int          send_nbytes;
    int          cn;
    int          wc;
    int           a;
    int          pa;

    cn=(int)pcn;
    Log("%03d thdA              thread begin...\n",cn);
    a=0;
    while (1) {
        Sleep(100);
        memset(Abuf,a,ASIZE);
        a=(a+1)%256;
        if (16==a) {No_Loop=1;break;}//去掉这句可以让程序一直循环直到按Ctrl+C或Ctrl+Break或当前目录下存在文件No_Loop
        send_buf=(char *)Abuf;
        send_nbytes=ASIZE;
        Log("%03d sending %d bytes\n",cn,send_nbytes);
        HexDump(cn,send_buf,send_nbytes);
        wc=0;
        while (1) {
            pa=PutToRBuf(cn,&cs_BBB,&BBB,send_buf,send_nbytes);
            Log("%03d sent %d bytes\n",cn,pa);
            HexDump(cn,send_buf,pa);
            send_buf+=pa;
            send_nbytes-=pa;
            if (send_nbytes<=0) break;//
            Sleep(1000);
            if (No_Loop) break;//
            wc++;
            if (wc>3600) Log("%03d %d==wc>3600!\n",cn,wc);
        }
        if (No_Loop) break;//
    }
}
int main() {
    InitializeCriticalSection(&cs_log );
    Log("Start===========================================================\n");
    InitializeCriticalSection(&cs_HEX );
    InitializeCriticalSection(&cs_BBB );

    BBB.head=0;
    BBB.tail=0;
    BBB.size=0;

    _beginthread((void(__cdecl *)(void *))thdA,0,(void *)1);
    _beginthread((void(__cdecl *)(void *))thdB,0,(void *)2);

    if (!access("No_Loop",0)) {
        remove("No_Loop");
        if (!access("No_Loop",0)) {
            No_Loop=1;
        }
    }
    while (1) {
        Sleep(1000);
        if (No_Loop) break;//
        if (!access("No_Loop",0)) {
            No_Loop=1;
        }
    }
    Sleep(3000);
    DeleteCriticalSection(&cs_BBB );
    DeleteCriticalSection(&cs_HEX );
    Log("End=============================================================\n");
    DeleteCriticalSection(&cs_log );
    return 0;
}

大尾巴猫 2013-06-06

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#include <windows.h>
#include <process.h>
#include <iostream>
using namespace std;

const int Threadnum = 2; //线程数量
const int Questnum = 200; //任务数量

struct Threadarg   //传入线程函数的参数结构
{
	volatile int* p_count;
	int* p_data;
	CRITICAL_SECTION* p_cs;
};

unsigned int _stdcall proc(void* argv);  //线程入口函数

int main()
{
	int data[Questnum]; //模拟任务的数组
	for (int i = 0; i < Questnum; i++)
	{
		data[i] = i;
	}
	volatile int count = 0;  //控制变量
    CRITICAL_SECTION cs;
	InitializeCriticalSectionAndSpinCount(&cs,4000); //关键段初始化
	//设定参数
	Threadarg arg;
	arg.p_count = &count;
	arg.p_data = data;
	arg.p_cs = &cs;
	
	HANDLE h[Threadnum];
	for (int i = 0; i < Threadnum; i++)
	{
		h[i] = (HANDLE) _beginthreadex(NULL, 0, proc, (void*)&arg, 0, NULL); //最好用_beginthreadex函数创建线程，不要用createthread
	}
	WaitForMultipleObjects(Threadnum, h, true, INFINITE); //等待所有线程安全退出
	for (int i = 0; i < Threadnum; i++)
	{
		CloseHandle(h[i]); //释放内核对象
	}
	DeleteCriticalSection(&cs); //释放关键段
	return 0;
}

unsigned int _stdcall proc(void* argv)
{
	//解析参数
	Threadarg* parg = (Threadarg*)argv;
	volatile int& count = *(parg->p_count);
	int* data = parg->p_data;
	CRITICAL_SECTION& cs = *(parg->p_cs);

	while (count < Questnum) //线程主循环
	{
		EnterCriticalSection(&cs); //加锁
		int n = count;
		count += 10;
		LeaveCriticalSection(&cs); //解锁
		for (int i = 0; i < 10; i++)
		{
			if (n < Questnum)
			{
				printf("处理任务%d\n", data[n++]);
			}
			else
			{
				break;
			}
		}
	}
	return 0;
}

luciferisnotsatan 2013-06-06

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引用 5 楼 blueskysqq 的回复:

[quote=引用 3 楼 luciferisnotsatan 的回复:]

  DWORD WINAPI Thread1(LPVOID lpParmeter)  
  {  
     while(true)
    {
     // 获得锁
     get10data();
     // 释放锁 
     if(noMoredats);
     {
        break;
     }
     
     deal();
    }
      return 0;  
  }

这都是什么函数。。。[/quote] 都是伪代码

何哀何欢 2013-06-06

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先把数据用list放，然后线程：锁定list 从list里pop出10个，解锁处理pop出的10个。不用写2个不同的函数，这一个，开2线程就可以。

buyong 2013-06-06

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thread pool

宋大小姐 2013-06-06

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引用 3 楼 luciferisnotsatan 的回复:

  DWORD WINAPI Thread1(LPVOID lpParmeter)  
  {  
     while(true)
    {
     // 获得锁
     get10data();
     // 释放锁 
     if(noMoredats);
     {
        break;
     }
     
     deal();
    }
      return 0;  
  }

这都是什么函数。。。

宋大小姐 2013-06-06

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引用 1 楼 Longee 的回复:

将数据每10个分一组，然后保存在队列que中每个线程依次从队列que获取一组数据进行处理，直到队列中的数据被处理完

已经申请好200个数据那么大的内存，每10个数据一组，怎样每个线程依次从队列que获取一组数据进行处理，直到队列中的数据被处理完？？求代码

luciferisnotsatan 2013-06-06

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  DWORD WINAPI Thread1(LPVOID lpParmeter)  
  {  
     while(true)
    {
     // 获得锁
     get10data();
     // 释放锁 
     if(noMoredats);
     {
        break;
     }
     
     deal();
    }
      return 0;  
  }

十八道胡同 2013-06-06

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先把数据放到线程安全的数据结构里，2个thread轮流去读取执行

Longee 2013-06-06

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将数据每10个分一组，然后保存在队列que中每个线程依次从队列que获取一组数据进行处理，直到队列中的数据被处理完

多线程怎么重复利用？？

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