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同步访问中的读写者问题(使用线程关键域)

#include <windows.h>

#include <stdlib.h>

#include <time.h>

#include <stdio.h>

struct CRITICAL_REGION

{

public:

CRITICAL_SECTION cs;

int gData;

};

DWORD WINAPI writer(LPVOID cr);

DWORD WINAPI reader(LPVOID cr);

int main(int argc,char* argv[])

{

DWORD targetThreadID;

HANDLE writerThread;

HANDLE readerThread;

CRITICAL_REGION cr;

cr.gData=0;

InitializeCriticalSection(&(cr.cs));

writerThread =CreateThread(NULL,0,writer,&cr,0,&targetThreadID);

CloseHandle(writerThread);

readerThread =CreateThread(NULL,0,reader,&cr,0,&targetThreadID);

CloseHandle(readerThread);

Sleep(10000);

printf("end");

return 0;

}

DWORD WINAPI writer(LPVOID cr)

{

Sleep(1000);

DWORD result = 0;

int n = 1;

ExitProcess(0);

while(n<=10)

{

EnterCriticalSection(&((CRITICAL_REGION*)cr)->cs);

if(((CRITICAL_REGION*)cr)->gData==0)

{

((CRITICAL_REGION*)cr)->gData = n;

printf("gData is %d\n",((CRITICAL_REGION*)cr)->gData);

n++;

}

LeaveCriticalSection(&(((CRITICAL_REGION*)cr)->cs));

Sleep(100);

}

return result;

};

DWORD WINAPI reader(LPVOID cr)

{

DWORD result =0;

char u[6];

int n = 1;

while(n<=10)

{

EnterCriticalSection(&((CRITICAL_REGION*)cr)->cs);

if(((CRITICAL_REGION*)cr)->gData!=0)

{

((CRITICAL_REGION*)cr)->gData = 0;

n++;

printf("gData is taken away\n");

}

LeaveCriticalSection(&(((CRITICAL_REGION*)cr)->cs));

Sleep(50);

}

DeleteCriticalSection( &(((CRITICAL_REGION*)cr)->cs));

gets(u);