pthread_create 找不到么？

amazingjxq

#include <stdio.h> #include <stdlib.h> #include <pthread.h> pthread_t ntid; void printids(const char *s) { &nbsp;&nbsp;&nbsp;&nbsp;pid_t pid; &nbsp;&nbsp;&nbsp;&nbsp;pthread_t tid; &nbsp;&nbsp;&nbsp;&nbsp;pid=getpid(); &nbsp;&nbsp;&nbsp;&nbsp;tid=pthread_self(); &nbsp;&nbsp;&nbsp;&nbsp;printf("%s pid %u tid %u (0x%x)\n",s,(unsigned int)pid, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(unsigned int)tid,(unsigned int)tid); } void *thr_fn(void *arg) { &nbsp;&nbsp;&nbsp;&nbsp;printf("new thread: "); &nbsp;&nbsp;&nbsp;&nbsp;return ((void *)0); } int main() { &nbsp;&nbsp;&nbsp;&nbsp;int err; &nbsp;&nbsp;&nbsp;&nbsp;err=pthread_create(&ntid,NULL,thr_fn,NULL); &nbsp;&nbsp;&nbsp;&nbsp;if(!err)printf("Can't create thread\n"); &nbsp;&nbsp;&nbsp;&nbsp;printids("main thread:"); &nbsp;&nbsp;&nbsp;&nbsp;sleep(1); &nbsp;&nbsp;&nbsp;&nbsp;exit(0); }

gcc ./thread.c
/tmp/ccIkgqUq.o: In function `main':
thread.c.text+0x8a): undefined reference to `pthread_create'
collect2: ld returned 1 exit status

为什么？

tianxiaogang12

你没有加 线程库  lpthread

ubuntuer

-lpthread

teng0210

gcc xxx.c -o xxx -lpthread