simple_thread.c

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
// unmark pthread_detach(), memory leak will be gone

void* process( void* data ) {
  printf( "hello world\n" );
}

main() {
  pthread_t th;
  pthread_create( &th, NULL, process, NULL );
  sleep( 1 );
  // pthread_detach( th );
  return 0;
}