gettid的一个小问题！！！请各位大侠支招……

aaron_xueli

代码如下：
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

void *handler(void *arg)
{
    printf("tid = %x  pid = %d \n",gettid(),getpid());
    return NULL;
}
int main()
{
    pthread_t tid;

    int ret = pthread_create(&tid,NULL,handler,NULL);
    if(ret)
    {
        fprintf(stderr,"%s\n",strerror(ret));
        exit(1);
    }

    printf("tid = %x  pid = %d \n", gettid(), getpid());
    pthread_join(tid,NULL);
    pthread_exit(NULL);

}

错误提示：

/tmp/cc4qHlVx.o: In function `handler':
gettid.c.text+0xf): undefined reference to `gettid'
/tmp/cc4qHlVx.o: In function `main':
gettid.c.text+0xa7): undefined reference to `gettid'
collect2: ld returned 1 exit status

jnjn999

undefined reference to `gettid'

ecjtubaowp

man gettid

aaron_xueli

pthread_self() 和 gettid 都是获得当前进程中的线程ID，但getttid就不无法编译通过呢？

hellioncu

是link的错误，缺少lib吧

donglongchao

回复 1# aaron_xueli
syscall