undefined reference to pthread create error

Question

When working with POSIX threads in a C program, I found "undefined reference to pthread create" error.

#include <stdio.h> 
#include <stdlib.h>

void *myThreadFun(void *vargp)
{ 
  sleep(1); 
  printf("Printing Sample \n"); 
  return NULL;
}

Although my gcc and g++ compilers are working pretty fine. Moreover, I am compiling this code using this command:

gcc test.c -o test

Answer 1

The error “undefined reference to pthread create” is caused when the pthread header is not included in the program file. Ensure that the header file is included properly as follows.

#include <pthread.h>

The other cause is that pthread is not used in the command line while compiling the code. To include the thread while compilation, use the syntax.

gcc -pthread -o threads <cprogram>.c

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