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

void initFunc(void)
{
 fprintf(stderr,"initFunc() in %d\n",
                (int)pthread_self()); /* ugly cast ! */
}

void * task(void * data)
{
 unsigned long i;

 fprintf(stderr,"begin task(%p) in %d\n",
                data,(int)pthread_self()); /* ugly cast ! */

 for(i=0;i<50*1000*1000;i++) {}
 pthread_once((pthread_once_t *)data,initFunc);
 for(i=0;i<50*1000*1000;i++) {}
 fprintf(stderr,"end task(%p) in %d\n",
                data,(int)pthread_self()); /* ugly cast ! */

 return((void *)0);
}

int main(void)
{
 pthread_once_t ctrl1=PTHREAD_ONCE_INIT;
 pthread_once_t ctrl2=PTHREAD_ONCE_INIT;
 pthread_t th[6];
 int i, j;

 for(i=0;i<6;i++)
 {
  if(pthread_create(&th[i],(pthread_attr_t *)0,task,i%2 ? &ctrl1 : &ctrl2))
    { fprintf(stderr,"Pb pthread_create()\n"); return(1); }
 }

 for(j=0;j<6;j++)
 {
  void * result;
  if(pthread_join(th[j],&result))
    { fprintf(stderr,"Pb pthread_join()\n"); return(1); }
 }

 return(0);
}