/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"

#if !defined(MPID_REQUEST_PTR_ARRAY_SIZE)
#define MPID_REQUEST_PTR_ARRAY_SIZE 16
#endif

/* -- Begin Profiling Symbol Block for routine MPI_Testsome */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Testsome = PMPI_Testsome
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Testsome  MPI_Testsome
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Testsome as PMPI_Testsome
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Testsome(int incount, MPI_Request array_of_requests[], int *outcount,
                 int array_of_indices[], MPI_Status array_of_statuses[]) __attribute__((weak,alias("PMPI_Testsome")));
#endif
/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
   the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Testsome
#define MPI_Testsome PMPI_Testsome

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Testsome

/*@
    MPI_Testsome - Tests for some given requests to complete

Input Parameters:
+ incount - length of array_of_requests (integer) 
- array_of_requests - array of requests (array of handles) 

Output Parameters:
+ outcount - number of completed requests (integer) 
. array_of_indices - array of indices of operations that 
completed (array of integers) 
- array_of_statuses - array of status objects for 
    operations that completed (array of Status).  May be 'MPI_STATUSES_IGNORE'.

Notes:

While it is possible to list a request handle more than once in the
'array_of_requests', such an action is considered erroneous and may cause the
program to unexecpectedly terminate or produce incorrect results.

.N ThreadSafe

.N waitstatus

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_IN_STATUS

@*/
int MPI_Testsome(int incount, MPI_Request array_of_requests[], int *outcount, 
		 int array_of_indices[], MPI_Status array_of_statuses[])
{
    static const char FCNAME[] = "MPI_Testsome";
    MPID_Request * request_ptr_array[MPID_REQUEST_PTR_ARRAY_SIZE];
    MPID_Request ** request_ptrs = request_ptr_array;
    MPI_Status * status_ptr;
    int i;
    int n_active;
    int n_inactive;
    int active_flag;
    int rc;
    int mpi_errno = MPI_SUCCESS;
    MPIU_CHKLMEM_DECL(1);
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_TESTSOME);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPID_MPI_PT2PT_FUNC_ENTER(MPID_STATE_MPI_TESTSOME);

    /* Check the arguments */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_COUNT(incount, mpi_errno);

	    if (incount != 0) {
		MPIR_ERRTEST_ARGNULL(array_of_requests, "array_of_requests", mpi_errno);
		MPIR_ERRTEST_ARGNULL(array_of_indices, "array_of_indices", mpi_errno);
		/* NOTE: MPI_STATUSES_IGNORE != NULL */
		MPIR_ERRTEST_ARGNULL(array_of_statuses, "array_of_statuses", mpi_errno);
	    }
	    MPIR_ERRTEST_ARGNULL(outcount, "outcount", mpi_errno);
 
	    for (i = 0; i < incount; i++) {
		MPIR_ERRTEST_ARRAYREQUEST_OR_NULL(array_of_requests[i], i, mpi_errno);
	    }
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */
    
    /* ... body of routine ... */
    
    *outcount = 0;
    
    /* Convert MPI request handles to a request object pointers */
    if (incount > MPID_REQUEST_PTR_ARRAY_SIZE)
    {
	MPIU_CHKLMEM_MALLOC_ORJUMP(request_ptrs, MPID_Request **, incount * sizeof(MPID_Request *), mpi_errno, "request pointers");
    }

    n_inactive = 0;
    for (i = 0; i < incount; i++)
    {
	if (array_of_requests[i] != MPI_REQUEST_NULL)
	{
	    MPID_Request_get_ptr(array_of_requests[i], request_ptrs[i]);
	    /* Validate object pointers if error checking is enabled */
#           ifdef HAVE_ERROR_CHECKING
	    {
		MPID_BEGIN_ERROR_CHECKS;
		{
		    MPID_Request_valid_ptr( request_ptrs[i], mpi_errno );
		    if (mpi_errno) goto fn_fail;
		}
		MPID_END_ERROR_CHECKS;
	    }
#           endif	    
	}
	else
	{
	    request_ptrs[i] = NULL;
	    n_inactive += 1;
	}
    }

    if (n_inactive == incount)
    {
	*outcount = MPI_UNDEFINED;
	goto fn_exit;
    }
    
    n_active = 0;
    
    mpi_errno = MPID_Progress_test();
    /* --BEGIN ERROR HANDLING-- */
    if (mpi_errno != MPI_SUCCESS)
	goto fn_fail;
    /* --END ERROR HANDLING-- */

    for (i = 0; i < incount; i++)
    {
	if (request_ptrs[i] != NULL && 
            request_ptrs[i]->kind == MPID_UREQUEST &&
            request_ptrs[i]->greq_fns->poll_fn != NULL)
	{
            mpi_errno = (request_ptrs[i]->greq_fns->poll_fn)(request_ptrs[i]->greq_fns->grequest_extra_state,
                                                             array_of_statuses);
	    if (mpi_errno != MPI_SUCCESS) goto fn_fail;
	}
        status_ptr = (array_of_statuses != MPI_STATUSES_IGNORE) ? &array_of_statuses[n_active] : MPI_STATUS_IGNORE;
        if (request_ptrs[i] != NULL)
        {
            if (MPID_Request_is_complete(request_ptrs[i]))
            {
                rc = MPIR_Request_complete(&array_of_requests[i], request_ptrs[i], status_ptr, &active_flag);
                if (active_flag)
                {
                    array_of_indices[n_active] = i;
                    n_active += 1;

                    if (rc == MPI_SUCCESS)
                    {
                        request_ptrs[i] = NULL;
                    }
                    else
                    {
                        mpi_errno = MPI_ERR_IN_STATUS;
                        if (status_ptr != MPI_STATUS_IGNORE)
                        {
                            status_ptr->MPI_ERROR = rc;
                        }
                    }
                }
                else
                {
                    request_ptrs[i] = NULL;
                    n_inactive += 1;
                }
            } else if (unlikely(MPIR_CVAR_ENABLE_FT &&
                        MPID_Request_is_anysource(request_ptrs[i]) &&
                        !MPID_Comm_AS_enabled(request_ptrs[i]->comm)))
            {
                mpi_errno = MPI_ERR_IN_STATUS;
                MPIR_ERR_SET(rc, MPIX_ERR_PROC_FAILED_PENDING, "**failure_pending");
                status_ptr = (array_of_statuses != MPI_STATUSES_IGNORE) ? &array_of_statuses[i] : MPI_STATUS_IGNORE;
                if (status_ptr != MPI_STATUS_IGNORE) status_ptr->MPI_ERROR = rc;
            }
        }
    }

    if (mpi_errno == MPI_ERR_IN_STATUS)
    {
	if (array_of_statuses != MPI_STATUSES_IGNORE)
	{ 
	    for (i = 0; i < n_active; i++)
	    {
		if (request_ptrs[array_of_indices[i]] == NULL)
		{ 
		    array_of_statuses[i].MPI_ERROR = MPI_SUCCESS;
		}
	    }
	}
	*outcount = n_active;
    }
    else if (n_active > 0)
    {
	*outcount = n_active;
    }
    else if (n_inactive == incount)
    {
	*outcount = MPI_UNDEFINED;
    }

    if (mpi_errno != MPI_SUCCESS) goto fn_fail;
    
    /* ... end of body of routine ... */
    
  fn_exit:
    if (incount > MPID_REQUEST_PTR_ARRAY_SIZE)
    {
	MPIU_CHKLMEM_FREEALL();
    }

    MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_TESTSOME);
    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    return mpi_errno;

  fn_fail:
    /* --BEGIN ERROR HANDLING-- */
#   ifdef HAVE_ERROR_CHECKING
    {
	mpi_errno = MPIR_Err_create_code(
	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, "**mpi_testsome",
	    "**mpi_testsome %d %p %p %p %p", incount, array_of_requests, outcount, array_of_indices, array_of_statuses);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}