/* -*- 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_Waitany = PMPIO_Waitany
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPIO_Waitany MPIO_Waitany
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPIO_Waitany as PMPIO_Waitany
/* 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_Waitany(int count, MPIO_Request requests[], int *index, MPI_Status * status)
{
    int i, flag, err;

    ROMIO_THREAD_CS_ENTER();

    if (count == 1) {
        err = MPIO_Wait(requests, status);
        if (!err)
            *index = 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) {
        *index = MPI_UNDEFINED;
#ifdef MPICH
        /* need to set empty status */
        if (status != MPI_STATUS_IGNORE) {
            status->MPI_SOURCE = MPI_ANY_SOURCE;
            status->MPI_TAG = MPI_ANY_TAG;
            MPIR_STATUS_SET_COUNT(*status, 0);
            MPIR_STATUS_SET_CANCEL_BIT(*status, 0);
        }
#endif
        err = MPI_SUCCESS;
        goto fn_exit;
    }

    err = MPI_SUCCESS;
    do {
        flag = 0;
        for (i = 0; i < count; i++) {
            if (requests[i] != MPIO_REQUEST_NULL) {
                err = MPIO_Test(&requests[i], &flag, status);
                if (flag) {
                    if (!err)
                        *index = i;
                    break;
                }
            }
        }
    } while (flag == 0);

  fn_exit:
    ROMIO_THREAD_CS_EXIT();

    return err;
}