采用事件内核对象实现线程同步的问题
/*在Initializ中完成对数组的输入初始化后，通知PrintFun线程，
打印出字符数组。但是程序结果不是我想要的，大家帮我看看
*/
#include <stdio.h>
#include <string.h>
#include <process.h>
#include <windows.h>
#define MAX_INDEX 5
HANDLE hEvent;
char array[MAX_INDEX] = "ABCD ";
void PrintFun(void);
void Initializ(void);
int main(void)
{
HANDLE hpr;
HANDLE hinit;
hEvent = CreateEvent(NULL, FALSE, TRUE, NULL);
hinit = (void*)_beginthread((void*)Initializ, 0, NULL);
hpr = (void*)_beginthread((void*)PrintFun, 0, NULL);
WaitForSingleObject(hinit,INFINITE);
WaitForSingleObject(hpr,INFINITE);
return 0;
}
void Initializ(void)
{
int i = 0;
char ch = '\0 ';
WaitForSingleObject(hEvent, INFINITE);
while (i < MAX_INDEX && ch != 'q ') {
ch = getchar();
array[i] = ch;
i++;
}
SetEvent(hEvent);
}
void PrintFun(void)
{
int i = 0;
WaitForSingleObject(hEvent,INFINITE);
while(i < MAX_INDEX) {
printf( "%c ",array[i]);
i++;
}
printf( "\n ");
}
/*在Initializ中完成对数组的输入初始化后，通知PrintFun线程，
打印出字符数组。但是程序结果不是我想要的，大家帮我看看
*/
[解决办法]
Initializ和PrintFun在开始的时候都等待hEvent对象，这个时候谁将获取hEvent对象是不确定的，如果PrintFun先获取了，就会出现lz不希望的结果。
[解决办法]
#include <stdio.h>
#include <string.h>
#include <process.h>
#include <windows.h>
#define MAX_INDEX 5
HANDLE hEvent;
char Array[MAX_INDEX] = "ABCD ";
void PrintFun(void*);
void Initializ(void*);
int main(void)
{
HANDLE hpr;
HANDLE hinit;
//hEvent = CreateEvent(NULL, FALSE, TRUE, NULL); ===> 改为:
hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
hinit = (HANDLE)_beginthread(Initializ, 0, NULL);
hpr = (HANDLE)_beginthread(PrintFun, 0, NULL);
WaitForSingleObject(hinit,INFINITE);
WaitForSingleObject(hpr,INFINITE);
system( "pause ");
return 0;
}
void Initializ(void* )
{
int i = 0;
char ch = '\0 ';
//WaitForSingleObject(hEvent, INFINITE); 去掉这一行!!!!!
while (i < MAX_INDEX && ch != 'q ') {
ch = getchar();
Array[i] = ch;
i++;
}
SetEvent(hEvent);
}
void PrintFun(void*)
{
int i = 0;
WaitForSingleObject(hEvent,INFINITE);
while(i < MAX_INDEX) {
printf( "%c ",Array[i]);
i++;
}
printf( "\n ");
}
