Trouble with continue communicating

[hellofinch]

I run your code, and it works fine.

I modify your code and want the client to send something to the server. But I failed.
The code in client:

#include "rdma_socket.hpp"
#include <unistd.h>

int main(int argc, char* argv[]) {
    rdma_socket client(RDMA_PS_TCP);

    client.resolve("12.7.14.35", 8000);
    client.create_qp();
    
    char* mem = new char[4096];
    client.post_recv(mem, 4096);

    client.connect();
 
    struct ibv_wc wc = client.recv_comp();
    printf("%s\n", reinterpret_cast<char*>(wc.wr_id));
    
    char* data = new char[4096];
    std::memcpy(data, "Hello serve!", 13);
    client.post_send(data, 4096);
    printf("ttt\n");
    sleep(1);
    printf("rrr\n");
    wc = client.send_comp();
    printf("xxx\n");
    return 0;
}

The server code:

#include "rdma_socket.hpp"
#include <unistd.h>

int main(int argc, char* argv[]) {
    rdma_socket server(RDMA_PS_TCP);

    server.bind("12.7.14.35", 8000);
    server.listen();
    rdma_socket rclient = server.accept();

    char* data = new char[4096];
    char* datax = new char[4096];
    std::memcpy(data, "Hello World!", 13); 
    // std::memcpy(datax, "Hello World!", 13); 

    rclient.post_send(data, 4096);
    
    rclient.post_recv(datax, 4096);
    std::cout << "yyy" << std::endl;
    
    struct ibv_wc wc = rclient.send_comp();
    printf("zzz\n");
    wc = rclient.recv_comp();
    printf("%s\n", reinterpret_cast<char*>(wc.wr_id));
    
    return 0;
}

When I run the code, both sides are stuck. The zzz didn't show up on the server's side. And on the client's side, the xxx didn't show up.

How can I make the code work?