/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *   Copyright (C) 2003 University of Chicago.
 *   See COPYRIGHT notice in top-level directory.
 */

#include "mpioimpl.h"

#ifdef HAVE_WEAK_SYMBOLS

#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPIO_Waitsome = PMPIO_Waitsome
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPIO_Waitsome MPIO_Waitsome
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPIO_Waitsome as PMPIO_Waitsome
/* end of weak pragmas */
#endif

/* Include mapping from MPI->PMPI */
#define MPIO_BUILD_PROFILING
#include "mpioprof.h"
#endif

/*
  This is a temporary function until we switch to using MPI-2's generalized
  requests.
*/

int MPIO_Waitsome(int count, MPIO_Request requests[], int *outcount,
                  int indices[], MPI_Status * statuses)
{
    int i, flag, err;

    ROMIO_THREAD_CS_ENTER();

    if (count == 1) {
        err = MPIO_Wait(requests, statuses);
        if (!err) {
            *outcount = 1;
            indices[0] = 0;
        }
        goto fn_exit;
    }

    /* Check for no active requests */
    for (i = 0; i < count; i++) {
        if (requests[i] != MPIO_REQUEST_NULL) {
            break;
        }
    }
    if (i == count) {
        *outcount = MPI_UNDEFINED;
        err = MPI_SUCCESS;
        goto fn_exit;
    }

    err = MPI_SUCCESS;
    *outcount = 0;
    do {
        for (i = 0; i < count; i++) {
            if (requests[i] != MPIO_REQUEST_NULL) {
                err = MPIO_Test(&requests[i], &flag, statuses);
                if (flag) {
                    if (!err) {
                        indices[0] = i;
                        indices++;
                        statuses++;
                        *outcount = *outcount + 1;
                    }
                }
            }
        }
    } while (*outcount == 0);

  fn_exit:
    ROMIO_THREAD_CS_EXIT();
    return err;
}