Date: Fri, 20 Dec 2002 02:34:45 +0100 From: Emiel Kollof <coolvibe@hackerheaven.org> To: freebsd-stable@freebsd.org Subject: pthread woes Message-ID: <20021220013445.GA75547@hackerheaven.org>
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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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