Subj : why this program can be linked successfully with and without -lpthread
To   : comp.programming.threads
From : Andy Yang
Date : Thu Jan 06 2005 12:56 pm

Just a simply program. But to my surprise, it can be linked
successfully with and without -lpthread option:
    gcc test.c
or
    gcc test.c -lpthread

Both works fine. However, the two linked version show different
behavior. I am using Fedore Core 3.

Thanks a lot!


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

int main()
{
   int i;
   pthread_mutex_t mutex;

   pthread_mutex_init(&mutex, NULL);

   for (i = 0; i < 1000000; i++)
   {
     pthread_mutex_lock(&mutex);
     pthread_mutex_unlock(&mutex);
   }

   pthread_mutex_destroy(&mutex);
   return 0;
}


Andy

.