关于一个socket在阻塞模式下是否还可以使用的实验

想到一个socket在多线程模式下，是否可以同时使用的问题，比如socket A阻塞在recv，而别的线程用socket A send是否能成功，下面上实验代码

 void thread_socket(int socket)
 {
     Sleep();
     int error = send(socket, "asd", strlen("asd"), );

     char recData[] = {};
     //setsockopt(socket, SOL_SOCKET, SO_RCVTIMEO, (char *)&time, sizeof(int));
     int ret = recv(socket, recData, , );
     getchar();
 }
 int main()
 {
     unsigned short port = ;

     char ch1[] = { ,,, };
     memcpy(ch1, &port, );
     string s1;
     s1= string(ch1, );
     string s("", );
     unsigned short unsi = ;
     char *ch = ((char*)&unsi);

     char ccc[] = {};
     unsigned short t = *((unsigned short *)(ch));

     WORD sockVersion = MAKEWORD(, );
     WSADATA data;
     if (WSAStartup(sockVersion, &data) != )
     {
         return ;
     }
     sockaddr_in serAddr;
     serAddr.sin_family = AF_INET;
     serAddr.sin_port = htons();
     inet_pton(AF_INET, "127.0.0.1", &serAddr.sin_addr);

     while (true)
     {
         SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
         if (sclient == INVALID_SOCKET)
         {
             printf("invalid socket!");
             return ;
         }
         if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
         {  //连接失败
             printf("connect error !");
             closesocket(sclient);
             return ;
         }
         send(sclient, "asd", strlen("asd"), );
         char recData[];
         int nNetTimeout = ;
         /*setsockopt(sclient, SOL_SOCKET, SO_RCVTIMEO, (char *)&nNetTimeout, sizeof(int));*/

         int opt_val;
         socklen_t opt_len = sizeof(opt_val);
         //getsockopt(sclient, IPPROTO_TCP, SO_SNDBUF, (char *)&opt_val, (socklen_t *)&opt_len);

         std::thread t(thread_socket, sclient);
         int i = ;
         while (i--)
         {
             int ret = recv(sclient, recData, , );
         if (ret > ) {
             recData[ret] = 0x00;
             printf(recData);
         }
     }
         closesocket(sclient);
     }
     WSACleanup();
     return ;
 }

经过实验发现，socket A阻塞在recv，而别的线程用socket A send是可以成功的。

还有个发现，当一个socket被多出recv时，内核返回时会回调最先调用recv的地方