/*****************************************************************************
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 * Copyright (c) 2003-2006 Intel Corporation.                                *
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 ***************************************************************************

For more documentation than found here, see

[1] doc/ReadMe_IMB.txt 

[2] Intel (R) MPI Benchmarks
    Users Guide and Methodology Description
    In 
    doc/IMB_ug.pdf
    
 File: IMB_window.c 

 Implemented functions: 

 IMB_window;

 ***************************************************************************/





#include "IMB_declare.h"
#include "IMB_benchmark.h"


#include "IMB_prototypes.h"


/*************************************************************************/



void IMB_window(struct comm_info* c_info, int size, int n_sample, 
                MODES RUN_MODE, double* time)
/*

                      
                      MPI-2 benchmark kernel
                      MPI_Win_create + MPI_Win_fence + MPI_Win_free
                      


Input variables: 

-c_info               (type struct comm_info*)                      
                      Collection of all base data for MPI;
                      see [1] for more information
                      

-size                 (type int)                      
                      Basic message size in bytes

-n_sample             (type int)                      
                      Number of repetitions (for timing accuracy)

-RUN_MODE             (type MODES)                      
                      Mode (aggregate/non aggregate; blocking/nonblocking);
                      see "IMB_benchmark.h" for definition


Output variables: 

-time                 (type double*)                      
                      Timing result per sample


*/
{
  double t1, t2;
  int    i, dum;

  ierr = 0;

  if(c_info->rank!=-1)
    {
      for(i=0; i<N_BARR; i++) MPI_Barrier(c_info->communicator);

      t1 = MPI_Wtime();
      for(i=0;i< n_sample;i++)
	{
          ierr = MPI_Win_create(c_info->r_buffer,size,1,MPI_INFO_NULL,
                                c_info->communicator, &c_info->WIN);
          MPI_ERRHAND(ierr);
          ierr = MPI_Win_fence(0, c_info->WIN);
          MPI_ERRHAND(ierr);
/* July 2002 fix V2.2.1, empty window case */
          if(size>0)
          {
          ierr = MPI_Put(c_info->s_buffer, 1, c_info->s_data_type,
                         c_info->rank, 0, 1, c_info->r_data_type, c_info->WIN);
          MPI_ERRHAND(ierr);
          }
          ierr = MPI_Win_free(&c_info->WIN);
          MPI_ERRHAND(ierr);
	}
      t2 = MPI_Wtime();
      *time=(t2 - t1)/(n_sample);
    }
  else
    { 
      *time = 0.; 
    }
}