Undefined reference to pthread_create pthread_join' in Linux

Asked Apr 28 '17 at 10:38

Active Apr 28 '17 at 11:12

Viewed 1,149 times

#include <stdio.h>
#include <pthread.h>
volatile int Licznik;

void * thread1 (void * v1){
    while(1) Licznik++;
}

void * thread2 (void * v1){
    while(1) printf("%d ", Licznik);
}

int main(){
    pthread_t w1, w2;
    pthread_create(&w1, NULL, thread1, NULL);
    pthread_create(&w2, NULL, thread2, NULL);
    sleep(5);
    pthread_join(w1, NULL);
    return 0;
}

The error is:

/tmp/ccfGEzAp.o: In function `main':
main1.c:(.text+0x6c): undefined reference to `pthread_create'
main1.c:(.text+0x87): undefined reference to `pthread_create'
main1.c:(.text+0xa7): undefined reference to `pthread_jo

edited Apr 28 '17 at 11:12

mch

9,424
2
28
42

asked Apr 28 '17 at 10:38

derekko12321312

5

Tried compiling with `-pthread`? – Cong Ma Apr 28 '17 at 10:41
2

Use `-lpthread` flag with gcc during compilation – kuro Apr 28 '17 at 10:42
2

Also see http://stackoverflow.com/questions/2127797/gcc-significance-of-pthread-flag-when-compiling – Ian Abbott Apr 28 '17 at 10:43
1

may be you can compile with -lpthread – Mattia Dinosaur Apr 28 '17 at 10:44
8

Possible duplicate of [Undefined reference to pthread\_create in Linux](http://stackoverflow.com/questions/1662909/undefined-reference-to-pthread-create-in-linux) – P.P Apr 28 '17 at 10:57

Undefined reference to pthread_create pthread_join' in Linux

0 Answers0