/*
 * thread_error.c
 *
 * Demonstrate detection of errors from a typical POSIX 1003.1c-1995
 * function, pthread_join.
 */
#include <pthread.h>
#include <stdio.h>
#include <errno.h>

int main (int argc, char *argv[])
{
    pthread_t thread;
    int status;

    /*
     * Attempt to join with an uninitialized thread ID. On most
     * implementations, this will return an ESRCH error code. If
     * the local (and uninitialized) pthread_t happens to be a valid
     * thread ID, it is almost certainly that of the initial thread,
     * which is running main(). In that case, your Pthreads
     * implementation may either return EDEADLK (self-deadlock),
     * or it may hang. If it hangs, quit and try again.
     */
    status = pthread_join (thread, NULL);
    if (status != 0)
        fprintf (stderr, "error %d: %s\n", status, strerror (status));
    return status;
}