From owner-freebsd-stable  Thu Dec 19 17:42:47 2002
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From: Jorge Aldana <jorge@salk.edu>
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To: Emiel Kollof <coolvibe@hackerheaven.org>
Cc: freebsd-stable@FreeBSD.ORG
Subject: Re: pthread woes
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I compiled it as follows and get the output listed below:

>g++ -pthread newTest.c
>./a.out
Creating thread 0
Creating thread 1
Creating thread 2
Creating thread 3
Creating thread 4

0: Hello World!

1: Hello World!

2: Hello World!

3: Hello World!

4: Hello World!


Jorge

On Fri, 20 Dec 2002, Emiel Kollof wrote:

> Hi folks,
>
> I have a problem with compiling stuff that uses POSIX threads. I used
> the following snippet of code to test:
>
> --- test.c ---
>
> #include <pthread.h>
> #include <stdio.h>
> #define NUM_THREADS     5
>
> void *PrintHello(void *threadid)
> {
> 	printf("\n%d: Hello World!\n", threadid);
> 	pthread_exit(NULL);
> }
>
> int main()
> {
> 	pthread_t threads[NUM_THREADS];
> 	int rc, t;
> 	for(t=0;t < NUM_THREADS;t++){
> 		printf("Creating thread %d\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);
> }
>
> --- end test.c ---
>
> When I compile it, I get the following errors:
>
> % gcc test.c -o test.c
> /tmp/ccF3QI1k.o: In function `PrintHello':
> /tmp/ccF3QI1k.o(.text+0x20): undefined reference to `pthread_exit'
> /tmp/ccF3QI1k.o: In function `main':
> /tmp/ccF3QI1k.o(.text+0x76): undefined reference to `pthread_create'
> /tmp/ccF3QI1k.o(.text+0xba): undefined reference to `pthread_exit'
>
> It compiles fine when I use -lc_r. This also breaks a lot of ports. What's
> going on?
>
> Cheers,
> Emiel
> --
> The man who sets out to carry a cat by its tail learns something that
> will always be useful and which never will grow dim or doubtful.
> 		-- Mark Twain.
>
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