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Sample code to illustrate multiple threads binding on the same port using SO_REUSEPORT option introduced in kernel 3.9. Here is the LWN article on the same https://lwn.net/Articles/542629/
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| #include <unistd.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <stdio.h> | |
| #include <stdbool.h> | |
| #include <arpa/inet.h> | |
| #include <pthread.h> | |
| void* do_work(void *arg) | |
| { | |
| int *port = (int *) arg; | |
| int listen_socket = socket(AF_INET, SOCK_STREAM, 0); | |
| int one = 1; | |
| setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &one, sizeof(one)); | |
| struct sockaddr_in serv_addr; | |
| memset(&serv_addr, 0, sizeof(serv_addr)); | |
| serv_addr.sin_family = AF_INET; | |
| serv_addr.sin_addr.s_addr = INADDR_ANY; | |
| serv_addr.sin_port = htons(*port); | |
| int ret = bind(listen_socket, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); | |
| if (ret == -1) | |
| { | |
| printf("Failed to bind to port\n"); | |
| return NULL; | |
| } | |
| listen(listen_socket, 5); | |
| struct sockaddr_in cli_addr; | |
| memset(&cli_addr, 0, sizeof(cli_addr)); | |
| int addr_length = sizeof(cli_addr); | |
| do | |
| { | |
| int cli_sock = accept(listen_socket, (struct sockaddr *) &cli_addr, (socklen_t *) &addr_length); | |
| close(cli_sock); | |
| } while (true); | |
| close(listen_socket); | |
| return 0; | |
| } | |
| int main(int ac, const char *av[]) | |
| { | |
| if (ac != 2) | |
| { | |
| printf("Usage: liser <port>\n"); | |
| return 1; | |
| } | |
| int port = atoi(av[1]); | |
| const int MAX_THREADS = 10; | |
| pthread_t tid[MAX_THREADS]; | |
| for (int i = 0; i < MAX_THREADS; i++) { | |
| pthread_create(&tid[i], NULL, do_work, &port); | |
| } | |
| for (int i = 0; i < MAX_THREADS; i++) { | |
| pthread_join(tid[i], NULL); | |
| } | |
| return 0; | |
| } |
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