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#include <winsock2.h>
#include <stdio.h>
//#include <time.h>
#pragma comment(lib, "ws2_32.lib")
PHOSTENT hostinfo;
SOCKET sock_id;
SOCKADDR_IN my_addr;
CRITICAL_SECTION gcs; //临界区
void Interface();
int StartSock();
int CreateSocket();
DWORD WINAPI threadA(void);
int i = 0;
int main(int argc, char **argv)
{
Interface();
if (-1 == StartSock())
return -1;
if (-1 == CreateSocket())
return -1;
WSACleanup();
return 0;
}
void Interface()
{
}
int StartSock()
{
WSADATA wsaData;
char name[60];
//初始化套接字
if (0 != WSAStartup(MAKEWORD(2, 2), &wsaData))
{
printf("WSAStartup error!\n");
return -1;
}
if (0 != gethostname(name, sizeof(name)))
{
printf("gethostname error!\n");
return -1;
}
hostinfo = gethostbyname(name);
if (NULL == hostinfo)
{
printf("gethostbyname error!\n");
return -1;
}
return 0;
}
int CreateSocket()
{
HANDLE hFind[10];
//建立流套接字句柄
sock_id = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (INVALID_SOCKET == sock_id)
{
printf("socket error!\n");
WSACleanup();
return -1;
}
InitializeCriticalSection(&gcs); //初始化临界区
for (int i = 0; i < 10; ++i)
{
hFind = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)threadA, 0, 0, NULL);
Sleep(500);
}
WaitForMultipleObjects(10,hFind,TRUE,100000); //等待所有的线程完成 等待函数
DeleteCriticalSection(&gcs); //删除临界区
return 0;
}
DWORD WINAPI threadA(void)
{
while(i < 60000)
{
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(i);
my_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
if (SOCKET_ERROR == connect(sock_id, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)))
{
printf("Port %d -close\n", i);
}
else
{
printf("Port %d -open\n", i);
}
//EnterCriticalSection(&gcs); //进入临界区
++i;
//LeaveCriticalSection(&gcs); //离开临界区
}
closesocket(sock_id);
return 0;
}
在没加WaitForMultipleObjects()前,输出是有重复的,输出也就20几行,当加了WaitForMultipleObjects()后,输出全部端口,也无重复,不知道这是为什么?
还有Sleep()、临界区,它们的作用是什么,在这里有没有用? |
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