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Too simple to explain, just read the code.

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

pthread_t pid;

void *mythr1(void *_)
{
        printf("#1 equal = %d\n", pthread_equal(pid, pthread_self()));
        return (void *)0;
}

void *mythr2(void *_)
{
        printf("#2 equal = %d\n", pthread_equal(pid, pthread_self()));
        return (void *)0;
}

int main()
{
        pthread_t pid2;
        pthread_create(&pid, NULL, mythr1, NULL);
        pthread_create(&pid2, NULL, mythr2, NULL);

        pthread_join(pid, NULL);
        pthread_join(pid2, NULL);

        return 0;
}
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$ ./a.out
#1 equal = 1
#2 equal = 0
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