/*
 * Copyright (C) by Argonne National Laboratory
 *     See COPYRIGHT in top-level directory
 */

#include "mpiimpl.h"
#include "attr.h"

/* -- Begin Profiling Symbol Block for routine MPI_Comm_create_keyval */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Comm_create_keyval = PMPI_Comm_create_keyval
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Comm_create_keyval  MPI_Comm_create_keyval
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Comm_create_keyval as PMPI_Comm_create_keyval
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Comm_create_keyval(MPI_Comm_copy_attr_function * comm_copy_attr_fn,
                           MPI_Comm_delete_attr_function * comm_delete_attr_fn, int *comm_keyval,
                           void *extra_state)
    __attribute__ ((weak, alias("PMPI_Comm_create_keyval")));
#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_Comm_create_keyval
#define MPI_Comm_create_keyval PMPI_Comm_create_keyval

int MPIR_Comm_create_keyval_impl(MPI_Comm_copy_attr_function * comm_copy_attr_fn,
                                 MPI_Comm_delete_attr_function * comm_delete_attr_fn,
                                 int *comm_keyval, void *extra_state)
{
    int mpi_errno = MPI_SUCCESS;
    MPII_Keyval *keyval_ptr;

    keyval_ptr = (MPII_Keyval *) MPIR_Handle_obj_alloc(&MPII_Keyval_mem);
    MPIR_ERR_CHKANDJUMP(!keyval_ptr, mpi_errno, MPI_ERR_OTHER, "**nomem");

    /* Initialize the attribute dup function */
    if (!MPIR_Process.attr_dup) {
        MPIR_Process.attr_dup = MPIR_Attr_dup_list;
        MPIR_Process.attr_free = MPIR_Attr_delete_list;
    }

    /* The handle encodes the keyval kind.  Modify it to have the correct
     * field */
    keyval_ptr->handle = (keyval_ptr->handle & ~(0x03c00000)) | (MPIR_COMM << 22);
    MPIR_Object_set_ref(keyval_ptr, 1);
    keyval_ptr->was_freed = 0;
    keyval_ptr->kind = MPIR_COMM;
    keyval_ptr->extra_state = extra_state;
    keyval_ptr->copyfn.user_function = comm_copy_attr_fn;
    keyval_ptr->copyfn.proxy = MPII_Attr_copy_c_proxy;
    keyval_ptr->delfn.user_function = comm_delete_attr_fn;
    keyval_ptr->delfn.proxy = MPII_Attr_delete_c_proxy;

    MPIR_OBJ_PUBLISH_HANDLE(*comm_keyval, keyval_ptr->handle);

  fn_exit:
    return mpi_errno;
  fn_fail:

    goto fn_exit;
}

#endif

/*@
   MPI_Comm_create_keyval - Create a new attribute key

Input Parameters:
+ comm_copy_attr_fn - Copy callback function for 'keyval'
. comm_delete_attr_fn - Delete callback function for 'keyval'
- extra_state - Extra state for callback functions

Output Parameters:
. comm_keyval - key value for future access (integer)

Notes:
Key values are global (available for any and all communicators).

Default copy and delete functions are available.  These are
+ MPI_COMM_NULL_COPY_FN   - empty copy function
. MPI_COMM_NULL_DELETE_FN - empty delete function
- MPI_COMM_DUP_FN         - simple dup function

There are subtle differences between C and Fortran that require that the
copy_fn be written in the same language from which 'MPI_Comm_create_keyval'
is called.
This should not be a problem for most users; only programmers using both
Fortran and C in the same program need to be sure that they follow this rule.

.N AttrErrReturn

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS

.seealso MPI_Comm_free_keyval
@*/
int MPI_Comm_create_keyval(MPI_Comm_copy_attr_function * comm_copy_attr_fn,
                           MPI_Comm_delete_attr_function * comm_delete_attr_fn,
                           int *comm_keyval, void *extra_state)
{
    int mpi_errno = MPI_SUCCESS;
    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_COMM_CREATE_KEYVAL);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_COMM_CREATE_KEYVAL);

    /* Validate parameters and objects (post conversion) */
#ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            MPIR_ERRTEST_ARGNULL(comm_keyval, "comm_keyval", mpi_errno);
        }
        MPID_END_ERROR_CHECKS;
    }
#endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */

    mpi_errno =
        MPIR_Comm_create_keyval_impl(comm_copy_attr_fn, comm_delete_attr_fn, comm_keyval,
                                     extra_state);
    if (mpi_errno)
        goto fn_fail;

    /* ... end of body of routine ... */

  fn_exit:
    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_COMM_CREATE_KEYVAL);
    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, __func__, __LINE__, MPI_ERR_OTHER,
                                 "**mpi_comm_create_keyval", "**mpi_comm_create_keyval %p %p %p %p",
                                 comm_copy_attr_fn, comm_delete_attr_fn, comm_keyval, extra_state);
    }
#endif
    mpi_errno = MPIR_Err_return_comm(NULL, __func__, mpi_errno);
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}
