linux 'pthread_create'未定义的引用,c - Undefined reference to pthread_create in Linux - Stack Overflow...

I picked up the following demo off the web from https://computing.llnl.gov/tutorials/pthreads/

#include

#include

#define NUM_THREADS 5

void *PrintHello(void *threadid)

{

long tid;

tid = (long)threadid;

printf("Hello World! It's me, thread #%ld!\n", tid);

pthread_exit(NULL);

}

int main (int argc, char *argv[])

{

pthread_t threads[NUM_THREADS];

int rc;

long t;

for(t=0; t

printf("In main: creating thread %ld\n", t);

rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);

if (rc){

printf("ERROR; return code from pthread_create() is %d\n", rc);

exit(-1);

}

}

pthread_exit(NULL);

}

But when I compile it on my machine (running Ubuntu Linux 9.04) I get the following error:

corey@ubuntu:~/demo$ gcc -o term term.c

term.c: In function ‘main’:

term.c:23: warning: incompatible implicit declaration of built-in function ‘exit’

/tmp/cc8BMzwx.o: In function `main':

term.c:(.text+0x82): undefined reference to `pthread_create'

collect2: ld returned 1 exit status

This doesn't make any sense to me, because the header includes pthread.h, which should have the pthread_create function. Any ideas what's going wrong?