/* -*- 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"
#include "attr.h"

/* -- Begin Profiling Symbol Block for routine MPI_Comm_delete_attr */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Comm_delete_attr = PMPI_Comm_delete_attr
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Comm_delete_attr  MPI_Comm_delete_attr
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Comm_delete_attr as PMPI_Comm_delete_attr
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Comm_delete_attr(MPI_Comm comm, int comm_keyval) __attribute__((weak,alias("PMPI_Comm_delete_attr")));
#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_delete_attr
#define MPI_Comm_delete_attr PMPI_Comm_delete_attr

#undef FUNCNAME
#define FUNCNAME MPIR_Comm_delete_attr_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Comm_delete_attr_impl(MPID_Comm *comm_ptr, MPID_Keyval *keyval_ptr)
{
    int mpi_errno = MPI_SUCCESS;
    MPID_Attribute *p, **old_p;
         
    /* Look for attribute.  They are ordered by keyval handle */

    old_p = &comm_ptr->attributes;
    p     = comm_ptr->attributes;
    while (p) {
	if (p->keyval->handle == keyval_ptr->handle) {
	    break;
	}
	old_p = &p->next;
	p     = p->next;
    }

    /* We can't unlock yet, because we must not free the attribute until
       we know whether the delete function has returned with a 0 status
       code */

    if (p) {
        int in_use;

        /* Run the delete function, if any, and then free the
	   attribute storage.  Note that due to an ambiguity in the
	   standard, if the usr function returns something other than
	   MPI_SUCCESS, we should either return the user return code,
	   or an mpich error code.  The precedent set by the Intel
	   test suite says we should return the user return code.  So
	   we must not ERR_POP here. */
	mpi_errno = MPIR_Call_attr_delete( comm_ptr->handle, p );
        if (mpi_errno) goto fn_fail;
        
        /* We found the attribute.  Remove it from the list */
        *old_p = p->next;
        /* Decrement the use of the keyval */
        MPIR_Keyval_release_ref( p->keyval, &in_use);
        if (!in_use) {
            MPIU_Handle_obj_free( &MPID_Keyval_mem, p->keyval );
        }
        MPID_Attr_free(p);
    }

 fn_exit:
    return mpi_errno;
 fn_fail:
    goto fn_exit;
}

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Comm_delete_attr
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
   MPI_Comm_delete_attr - Deletes an attribute value associated with a key on 
   a  communicator

Input Parameters:
+ comm - communicator to which attribute is attached (handle) 
- comm_keyval - The key value of the deleted attribute (integer) 

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_PERM_KEY

.seealso MPI_Comm_set_attr, MPI_Comm_create_keyval
@*/
int MPI_Comm_delete_attr(MPI_Comm comm, int comm_keyval)
{
    int mpi_errno = MPI_SUCCESS;
    MPID_Comm *comm_ptr = NULL;
    MPID_Keyval *keyval_ptr;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_COMM_DELETE_ATTR);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_COMM_DELETE_ATTR);

    /* Validate parameters, especially handles needing to be converted */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_COMM(comm, mpi_errno);
	    MPIR_ERRTEST_KEYVAL(comm_keyval, MPID_COMM, "communicator", mpi_errno);
	    MPIR_ERRTEST_KEYVAL_PERM(comm_keyval, mpi_errno);
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif

    /* Convert MPI object handles to object pointers */
    MPID_Comm_get_ptr( comm, comm_ptr );
    MPID_Keyval_get_ptr( comm_keyval, keyval_ptr );
    
    /* Validate parameters and objects (post conversion) */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            /* Validate comm_ptr */
            MPID_Comm_valid_ptr( comm_ptr, mpi_errno, TRUE );
	    /* If comm_ptr is not valid, it will be reset to null */
            /* Validate keyval_ptr */
	    MPID_Keyval_valid_ptr( keyval_ptr, mpi_errno );
            if (mpi_errno) goto fn_fail;
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

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

    mpi_errno = MPIR_Comm_delete_attr_impl(comm_ptr, keyval_ptr);
    if (mpi_errno) goto fn_fail;
    
    /* ... end of body of routine ... */

  fn_exit:
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_COMM_DELETE_ATTR);
    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_comm_delete_attr",
	    "**mpi_comm_delete_attr %C %d", comm, comm_keyval);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}