omp_for_schedule_static.c

Go to the documentation of this file.

// RUN: %libomp-compile-and-run
#include <stdio.h>
#include <stdlib.h>
#include "omp_testsuite.h"
#include "omp_my_sleep.h"
 
#define CFSMAX_SIZE 1000
#define MAX_TIME 0.01
 
#ifdef SLEEPTIME
#undef SLEEPTIME
#define SLEEPTIME 0.0005
#endif
 
int test_omp_for_schedule_static()
{
  int threads;
  int i,lasttid;
  int * tids;
  int notout;
  int maxiter;
  int chunk_size;
  int counter = 0;
  int tmp_count=1;
  int lastthreadsstarttid = -1;
  int result = 1;
 
  chunk_size = 7;
  tids = (int *) malloc (sizeof (int) * (CFSMAX_SIZE + 1));
  notout = 1;
  maxiter = 0;
 
  #pragma omp parallel shared(tids,counter)
  {  /* begin of parallel*/
    #pragma omp single
    {
      threads = omp_get_num_threads ();
    }  /* end of single */
  }  /* end of parallel */
 
  if (threads < 2) {
    omp_set_num_threads(2);
    threads = 2;
  }
  fprintf (stderr,"Using an internal count of %d\nUsing a specified"
    " chunksize of %d\n", CFSMAX_SIZE, chunk_size);
  tids[CFSMAX_SIZE] = -1;  /* setting endflag */
  #pragma omp parallel shared(tids)
  { /* begin of parallel */
    double count;
    int tid;
    int j;
 
    tid = omp_get_thread_num ();
 
    #pragma omp for nowait schedule(static,chunk_size)
    for(j = 0; j < CFSMAX_SIZE; ++j) {
      count = 0.;
      #pragma omp flush(maxiter)
      if (j > maxiter) {
        #pragma omp critical
        {
          maxiter = j;
        }
      }
      /*printf ("thread %d sleeping\n", tid);*/
      while (notout && (count < MAX_TIME) && (maxiter == j)) {
        #pragma omp flush(maxiter,notout)
        my_sleep (SLEEPTIME);
        count += SLEEPTIME;
        printf(".");
      }
#ifdef VERBOSE
      if (count > 0.) printf(" waited %lf s\n", count);
#endif
      /*printf ("thread %d awake\n", tid);*/
      tids[j] = tid;
#ifdef VERBOSE
      printf("%d finished by %d\n",j,tid);
#endif
    } /* end of for */
    notout = 0;
    #pragma omp flush(maxiter,notout)
  } /* end of parallel */
 
  /**** analysing the data in array tids ****/
 
  lasttid = tids[0];
  tmp_count = 0;
 
  for (i = 0; i < CFSMAX_SIZE + 1; ++i) {
    /* If the work  was done by the same thread increase tmp_count by one. */
    if (tids[i] == lasttid) {
      tmp_count++;
#ifdef VERBOSE
      fprintf (stderr, "%d: %d \n", i, tids[i]);
#endif
      continue;
    }
 
    /* Check if the next thread had has the right thread number. When finding
     * threadnumber -1 the end should be reached.
     */
    if (tids[i] == (lasttid + 1) % threads || tids[i] == -1) {
      /* checking for the right chunk size */
      if (tmp_count == chunk_size) {
        tmp_count = 1;
        lasttid = tids[i];
#ifdef VERBOSE
        fprintf (stderr, "OK\n");
#endif
      } else {
        /* If the chunk size was wrong, check if the end was reached */
        if (tids[i] == -1) {
          if (i == CFSMAX_SIZE) {
            fprintf (stderr, "Last thread had chunk size %d\n",
              tmp_count);
            break;
          } else {
            fprintf (stderr, "ERROR: Last thread (thread with"
              " number -1) was found before the end.\n");
            result = 0;
          }
        } else {
          fprintf (stderr, "ERROR: chunk size was %d. (assigned"
            " was %d)\n", tmp_count, chunk_size);
          result = 0;
        }
      }
    } else {
      fprintf(stderr, "ERROR: Found thread with number %d (should be"
        " inbetween 0 and %d).", tids[i], threads - 1);
      result = 0;
    }
#ifdef VERBOSE
    fprintf (stderr, "%d: %d \n", i, tids[i]);
#endif
  }
 
  return result;
}
 
int main()
{
  int i;
  int num_failed=0;
 
  for(i = 0; i < REPETITIONS; i++) {
    if(!test_omp_for_schedule_static()) {
      num_failed++;
    }
  }
  return num_failed;
}