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

typedef void * (*pthread_func_t) (void *);


void myfunc(void *arg)
{
   printf("slave : myfunc runs.\n");
}

main()
{
    int ret;

    pthread_t thread;

    printf("master : before create a thread ... \n");

    ret = pthread_create(&thread, NULL, (pthread_func_t)myfunc, NULL);
    perror("after creating a thread ... :");
   printf("master : after create a thread ... %d(%s)\n", ret, strerror(ret));

   if (ret == EAGAIN) {
      printf("error is EAGAIN\n");
   }
}