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libs/ck-libs/ampi/romio/mpi-io/iowaitany.c

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/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *
 *   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; 
    MPIU_THREADPRIV_DECL;

    MPIU_THREAD_CS_ENTER(ALLFUNC,);

    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 MPICH2
    /* need to set empty status */
    if (status != MPI_STATUS_IGNORE) {
        status->MPI_SOURCE = MPI_ANY_SOURCE;
        status->MPI_TAG    = MPI_ANY_TAG;
        status->count      = 0;
        status->cancelled  = 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:
    MPIU_THREAD_CS_EXIT(ALLFUNC,);

    return err;
}

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