C语言socket多线程编程限制客户端连接数
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先上一些多线程需要使用的函数定义：
代码如下:
DWORD WINAPI ProcessClientRequests(LPVOID lpParam) /pic/p>
{
return 0;
}
HANDLE handler=CreateThread(NULL, 0, ProcessClientRequests, &clientsocket, 0, NULL); /pic/p>
WaitForMultipleObjects(MAXCLIENTS, threads, TRUE, INFINITE); /pic/p>
for(int i=0;i
{
CloseHandle(threads[i]); /pic/p>
}
服务器端程序
主线程代码如下：
代码如下:
#define MAXCLIENTS 3 /pic/p>
int main()
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
HANDLE threads[MAXCLIENTS];
SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
sockaddr_in sockaddr;
sockaddr.sin_family=PF_INET;
sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
sockaddr.sin_port=htons(9000);
bind(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));
listen(s, 1);
printf("listening on port [%d].n", 9000);
int existingClientCount=0;
while(TRUE)
{
SOCKADDR clientAddr;
int size=sizeof(SOCKADDR);
SOCKET clientsocket;
clientsocket=accept(s, &clientAddr, &size);
printf("***SYS*** New client touched.n");
if(existingClientCount
{
threads[existingClientCount++]=CreateThread(NULL, 0, ProcessClientRequests, &clientsocket, 0, NULL); /pic/p>
}
else
{
char* msg="Exceeded Max incoming requests, will refused this connect!rn";
send(clientsocket, msg, strlen(msg)+sizeof(char), NULL); /pic/p>
printf("***SYS*** REFUSED.n");
closesocket(clientsocket); /pic/p>
break;
}
}
printf("Maximize clients occurred for d%.rn", MAXCLIENTS);
WaitForMultipleObjects(MAXCLIENTS, threads, TRUE, INFINITE); /pic/p>
closesocket(s);
for(int i=0;i
{
CloseHandle(threads[i]); /pic/p>
}
WSACleanup();
printf("Cleared all.rn");
getchar();
exit(0);
}
子线程函数定义
代码如下:
DWORD WINAPI ProcessClientRequests(LPVOID lpParam)
{
SOCKET* clientsocket=(SOCKET*)lpParam; /pic/p>
char* msg="Hello, my client.rn";
send(*clientsocket, msg, strlen(msg)+sizeof(char), NULL);
printf("***SYS*** HELLO.n");
while(TRUE)
{
char buffer[MAXBYTE]={0};
recv(*clientsocket, buffer, MAXBYTE, NULL);
if(strcmp(buffer, "exit")==0)
{
char* msg_bye="Bye.rn";
send(*clientsocket, msg_bye, strlen(msg_bye)+sizeof(char), NULL);
break;
}
printf("***Client*** %sn", buffer);
}
closesocket(*clientsocket);
return 0;
}
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