使用pthread_create和pthread_detach時出現錯誤

Question

我正在編程一個服務器，該服務器可以接收來自多個客戶端的消息，因此我正在使用多線程，但是在警告和錯誤（使我的代碼無法成功編譯）方面遇到了一些麻煩。 我進行了搜索，但仍然找不到導致這些錯誤的原因。

這是代碼：

#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <stdlib.h>
#include <strings.h>

#define ADRRESS "127.0.0.1"
#define PORT 9999


void *receive_tcp(void *clientfd)
{
    char buffer1[7];
    //char *buffer2;
    int n, i;

    n = read(clientfd, buffer1, sizeof(buffer1));

    for(i=0;i<n;i++)
    {
        printf("%c", buffer1[i]);
    }
}

void main()
{
    int sock;
    struct sockaddr_in s1;
    char buffer1[7];
    int n, i;

    printf("A criar socket...\n");

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        printf("Erro ao criar socket.\n");
        exit(1);
    }

    bzero(&s1, sizeof(s1));
    s1.sin_family = AF_INET;
    s1.sin_port = htons(PORT);
    s1.sin_addr.s_addr = INADDR_ANY;

    printf("A ligar ao socket...\n");

    if (bind(sock, (struct sockaddr*)&s1, sizeof(s1)) != 0)
    {
        printf("Erro ao ligar socket.\n");
        exit(1);
    }

    printf("A configurar socket...\n");

    if (listen(sock, 10) != 0)
    {
        printf("Erro ao configurar socket.\n");
        exit(1);
    }
    printf("A entrar no ciclo...\n");

    while(1)
    {
        int clientfd;
        struct sockaddr_in client_addr;
        int addrlen=sizeof(client_addr);

        pthread_t thread1;

        printf("À espera de uma nova ligação...\n");
        clientfd = accept(sock, (struct sockaddr*)&client_addr, &addrlen);
        /*n = read(clientfd, buffer1, sizeof(buffer1));

        for(i=0;i<n;i++)
        {
            printf("%c", buffer1[i]);
        }*/

        pthread_create(&thread1, 0, receive_tcp, clientfd);       
        pthread_detach(thread1);

    }
}

這是錯誤：

serv.c: In function ‘main’:
serv.c:82:3: warning: passing argument 4 of ‘pthread_create’ makes pointer from integer without a cast [enabled by default]
   pthread_create(&thread1, 0, receive_tcp, clientfd);       
   ^
In file included from serv.c:6:0:
/usr/include/pthread.h:244:12: note: expected ‘void * __restrict__’ but argument is of type ‘int’
 extern int pthread_create (pthread_t *__restrict __newthread,
            ^
/tmp/ccxdvY86.o: In function `main':
serv.c:(.text+0x1fe): undefined reference to `pthread_create'
serv.c:(.text+0x20a): undefined reference to `pthread_detach'
collect2: error: ld returned 1 exit status

Answer 1

該錯誤僅是由於您在編譯程序時未提供庫引用這一事實造成的。 只需使用編譯命令添加-lpthread