DouKaku?

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <omp.h>

void random_wait(int i) {
  int w;
  w=rand() % 10;
  fprintf(stderr,"begin %d - %d sec, thread %d/%d\n",i,w,
      omp_get_thread_num(), omp_get_num_threads());
  sleep(w);
  fprintf(stderr,"end   %d - %d sec, thread %d/%d\n",i,w,
      omp_get_thread_num(), omp_get_num_threads());
}

int main(int argc, char **argv) {
  fprintf(stderr,"Single Thread\n");
  sleep(4);
#pragma omp parallel num_threads(8)
  {
    int i;
    fprintf(stderr,"Multi Thread %d\n",omp_get_thread_num());
#pragma omp for schedule(dynamic) nowait
    for(i=0;i<20;i++) {
      random_wait(i);
    }
    fprintf(stderr,"finish %d\n",omp_get_thread_num());
#pragma omp barrier
#pragma omp master
    {
      fprintf(stderr,"Finish\n");
    }
  }
}