线程同步问题

[hjl0508]

总是报内存冲突，大家看看这个哪儿错了

#include <stdio.h>
#include <Windows.h>
#include <tchar.h>

int x;
CRITICAL_SECTION cs;
DWORD WINAPI threadSync1(LPVOID lpParam)
{
	
	while (1)
	{
		
		EnterCriticalSection(&cs);//执行到这儿就会报错
		x++;
		printf("x+1=%d",x);
		Sleep(1);
		LeaveCriticalSection(&cs);
	}
		
}

DWORD WINAPI threadSync2(LPVOID lpParam)
{
	
	while (1)
	{
		EnterCriticalSection(&cs);
		x=x-1;
		Sleep(1);
		printf("x-1=%d",x);
		EnterCriticalSection(&cs);
	}

}

int _tmain(int argc, _TCHAR* argv[])
{
	InitializeCriticalSection(&cs);
	x=10;
	printf("x=%d",x);
	HANDLE thread1=CreateThread(NULL,0,threadSync1,NULL,0,NULL);
	HANDLE thread2=CreateThread(NULL,0,threadSync2,NULL,0,NULL);
	CloseHandle(thread1);
	CloseHandle(thread2);
	 DeleteCriticalSection(&cs);
	return 0;
}

[zyc_0204]

主进程退出了。线程还在运行。

[hjl0508]

引用 1 楼 zyc_0204 的回复:

主进程退出了。线程还在运行。

那应该怎么改一下？

[zyc_0204]

int _tmain(int argc, _TCHAR* argv[])
{
    InitializeCriticalSection(&cs);
    x=10;
    printf("x=%d",x);
    HANDLE thread1=CreateThread(NULL,0,threadSync1,NULL,0,NULL);
    HANDLE thread2=CreateThread(NULL,0,threadSync2,NULL,0,NULL);
    CloseHandle(thread1);
    CloseHandle(thread2);
     DeleteCriticalSection(&cs);
     while(1)
       ;
    return 0;
}

[zyc_0204]

int _tmain(int argc, _TCHAR* argv[])
{
    InitializeCriticalSection(&cs);
    x=10;
    printf("x=%d",x);
    HANDLE thread1=CreateThread(NULL,0,threadSync1,NULL,0,NULL);
    HANDLE thread2=CreateThread(NULL,0,threadSync2,NULL,0,NULL);
    CloseHandle(thread1);
    CloseHandle(thread2);
     while(1)
       ;    

 DeleteCriticalSection(&cs);

    return 0;
}

[hjl0508]

引用 4 楼 zyc_0204 的回复:

int _tmain(int argc, _TCHAR* argv[])
{
    InitializeCriticalSection(&cs);
    x=10;
    printf("x=%d",x);
    HANDLE thread1=CreateThread(NULL,0,threadSync1,NULL,0,NULL);
    HANDLE thread2=CreateThread(NULL,0,threadSync2,NULL,0,NULL);
    CloseHandle(thread1);
    CloseHandle(thread2);
     while(1)
       ;    

 DeleteCriticalSection(&cs);

    return 0;
}

再问一下，我设想的是这两个线程轮流对x操作，来保持x在一个固定值或者一个小范围内波动。但是执行结果却是一直加或者一直减，要实现我要的那个结果该怎么办呢？

[hjl0508]

引用 5 楼 hjl0508 的回复:

再问一下，我设想的是这两个线程轮流对x操作，来保持x在一个固定值或者一个小范围内波动。但是执行结果却是一直加或者一直减，要实现我要的那个结果该怎么办呢？

解决了，是sleep放错位置了！谢谢了！

[FancyMouse]

DWORD WINAPI threadSync2(LPVOID lpParam) { while (1) { EnterCriticalSection(&cs); x=x-1; Sleep(1); printf("x-1=%d",x); EnterCriticalSection(&cs); } } 蛤？

[hjl0508]

引用 4 楼 zyc_0204 的回复:

int _tmain(int argc, _TCHAR* argv[])
{
    InitializeCriticalSection(&cs);
    x=10;
    printf("x=%d",x);
    HANDLE thread1=CreateThread(NULL,0,threadSync1,NULL,0,NULL);
    HANDLE thread2=CreateThread(NULL,0,threadSync2,NULL,0,NULL);
    CloseHandle(thread1);
    CloseHandle(thread2);
     while(1)
       ;    

 DeleteCriticalSection(&cs);

    return 0;
}

解决了，是sleep放错位置了！谢谢了！

[hjl0508]

引用 7 楼 FancyMouse 的回复:

DWORD WINAPI threadSync2(LPVOID lpParam) { while (1) { EnterCriticalSection(&cs); x=x-1; Sleep(1); printf("x-1=%d",x); EnterCriticalSection(&cs); } } 蛤？

这个。。。。我程序里改了。。。。这边当时给忘了。。。。见笑了。。。

[zyc_0204]

DWORD WINAPI threadSync1(LPVOID lpParam)
{
     
    while (1)
    {
         
        EnterCriticalSection(&cs);
        x += 6;
        x -= 6;
        printf("x+1=%d",x);
        Sleep(1);
        LeaveCriticalSection(&cs);
    }
         
}
 
DWORD WINAPI threadSync2(LPVOID lpParam)
{
     
    while (1)
    {
        EnterCriticalSection(&cs);
        x -= 8;
        x += 8;
        Sleep(1);
        printf("x-1=%d",x);
        EnterCriticalSection(&cs);
    }
 
}