284 строки
8.4 KiB
C
284 строки
8.4 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#ifndef OPAL_VALUE_ARRAY_H
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#define OPAL_VALUE_ARRAY_H
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#include <string.h>
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#include "ompi_config.h"
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#include "include/constants.h"
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#include "include/types.h"
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#include "opal/class/opal_object.h"
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#if OMPI_ENABLE_DEBUG
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#include "opal/util/output.h"
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#endif
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/*
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* @file Array of elements maintained by value.
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*
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* See ompi_bitmap.h for an explanation of why there is a split
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* between OMPI and ORTE for this generic class.
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*/
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#if defined(c_plusplus) || defined(__cplusplus)
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extern "C" {
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#endif
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OMPI_DECLSPEC extern opal_class_t opal_value_array_t_class;
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struct opal_value_array_t
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{
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opal_object_t super;
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unsigned char* array_items;
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size_t array_item_sizeof;
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size_t array_size;
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size_t array_alloc_size;
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};
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typedef struct opal_value_array_t opal_value_array_t;
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/**
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* Initialize the array to hold items by value. This routine must
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* be called prior to using the array.
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*
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* @param array The array to initialize (IN).
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* @param item_size The sizeof each array element (IN).
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* @return OMPI error code
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*
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* Note that there is no corresponding "finalize" function -- use
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* OBJ_DESTRUCT (for stack arrays) or OBJ_RELEASE (for heap arrays) to
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* delete it.
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*/
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static inline int opal_value_array_init(opal_value_array_t *array, size_t item_sizeof)
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{
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array->array_item_sizeof = item_sizeof;
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array->array_alloc_size = 1;
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array->array_size = 0;
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array->array_items = (unsigned char*)realloc(array->array_items, item_sizeof * array->array_alloc_size);
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return (NULL != array->array_items) ? OMPI_SUCCESS : OMPI_ERR_OUT_OF_RESOURCE;
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}
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/**
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* Reserve space in the array for new elements, but do not change the size.
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*
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* @param array The input array (IN).
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* @param size The anticipated size of the array (IN).
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* @return OMPI error code.
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*/
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static inline int opal_value_array_reserve(opal_value_array_t* array, size_t size)
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{
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if(size > array->array_alloc_size) {
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array->array_items = (unsigned char*)realloc(array->array_items, array->array_item_sizeof * size);
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if(NULL == array->array_items) {
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array->array_size = 0;
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array->array_alloc_size = 0;
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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array->array_alloc_size = 1;
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}
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return OMPI_SUCCESS;
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}
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/**
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* Retreives the number of elements in the array.
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*
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* @param array The input array (IN).
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* @return The number of elements currently in use.
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*/
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static inline size_t opal_value_array_get_size(opal_value_array_t* array)
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{
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return array->array_size;
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}
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/**
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* Set the number of elements in the array.
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*
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* @param array The input array (IN).
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* @param size The new array size.
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*
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* @return OMPI error code.
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*
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* Note that resizing the array to a smaller size may not change
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* the underlying memory allocated by the array. However, setting
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* the size larger than the current allocation will grow it. In either
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* case, if the routine is successful, opal_value_array_get_size() will
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* return the new size.
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*/
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int opal_value_array_set_size(opal_value_array_t* array, size_t size);
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/**
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* Macro to retrieve an item from the array by value.
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*
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* @param array The input array (IN).
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* @param item_type The C datatype of the array item (IN).
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* @param item_index The array index (IN).
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*
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* @returns item The requested item.
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*
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* Note that this does not change the size of the array - this macro is
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* strictly for performance - the user assumes the responsibility of
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* ensuring the array index is valid (0 <= item index < array size).
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*/
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#define OPAL_VALUE_ARRAY_GET_ITEM(array, item_type, item_index) \
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((item_type*)((array)->array_items))[item_index]
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/**
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* Retrieve an item from the array by reference.
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*
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* @param array The input array (IN).
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* @param index The array index (IN).
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*
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* @return ptr Pointer to the requested item.
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*
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* Note that if the specified index is larger than the current
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* array size, the array is grown to satisfy the request.
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*/
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static inline void* opal_value_array_get_item(opal_value_array_t *array, size_t index)
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{
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if(index >= array->array_size && opal_value_array_set_size(array, index+1) != OMPI_SUCCESS)
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return NULL;
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return array->array_items + (index * array->array_item_sizeof);
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}
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/**
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* Macro to set an array element by value.
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*
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* @param array The input array (IN).
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* @param item_type The C datatype of the array item (IN).
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* @param item_index The array index (IN).
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* @param item_value The new value for the specified index (IN).
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*
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* Note that this does not change the size of the array - this macro is
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* strictly for performance - the user assumes the responsibility of
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* ensuring the array index is valid (0 <= item index < array size).
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*
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* It is safe to free the item after returning from this call; it is
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* copied into the array by value.
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*/
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#define OPAL_VALUE_ARRAY_SET_ITEM(array, item_type, item_index, item_value) \
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(((item_type*)((array)->array_items))[item_index] = item_value)
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/**
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* Set an array element by value.
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*
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* @param array The input array (IN).
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* @param item_index The array index (IN).
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* @param item_value A pointer to the item, which is copied into
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* the array.
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*
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* @return OMPI error code.
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*
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* It is safe to free the item after returning from this call; it is
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* copied into the array by value.
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*/
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static inline int opal_value_array_set_item(opal_value_array_t *array, size_t index, const void* item)
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{
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int rc;
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if(index >= array->array_size &&
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(rc = opal_value_array_set_size(array, index+1)) != OMPI_SUCCESS)
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return rc;
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memcpy(array->array_items + (index * array->array_item_sizeof), item, array->array_item_sizeof);
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return OMPI_SUCCESS;
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}
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/**
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* Appends an item to the end of the array.
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*
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* @param array The input array (IN).
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* @param item A pointer to the item to append, which is copied
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* into the array.
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*
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* @return OMPI error code
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*
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* This will grow the array if it is not large enough to contain the
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* item. It is safe to free the item after returning from this call;
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* it is copied by value into the array.
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*/
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static inline int opal_value_array_append_item(opal_value_array_t *array, const void *item)
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{
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return opal_value_array_set_item(array, array->array_size, item);
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}
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/**
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* Remove a specific item from the array.
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*
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* @param array The input array (IN).
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* @param index The index to remove, which must be less than
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* the current array size (IN).
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*
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* @return OMPI error code.
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*
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* All elements following this index are shifted down.
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*/
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static inline int opal_value_array_remove_item(opal_value_array_t *array, size_t index)
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{
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#if OMPI_ENABLE_DEBUG
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if (index >= array->array_size) {
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opal_output(0, "opal_value_array_remove_item: invalid index %d\n", index);
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return OMPI_ERR_BAD_PARAM;
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}
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#endif
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memmove(array->array_items+(array->array_item_sizeof * index),
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array->array_items+(array->array_item_sizeof * (index+1)),
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array->array_item_sizeof * (array->array_size - index - 1));
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array->array_size--;
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return OMPI_SUCCESS;
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}
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/**
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* Get the base pointer of the underlying array.
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*
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* @param array The input array (IN).
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* @param array_type The C datatype of the array (IN).
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*
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* @returns ptr Pointer to the actual array.
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*
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* This function is helpful when you need to iterate through an
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* entire array; simply get the base value of the array and use native
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* C to iterate through it manually. This can have better performance
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* than looping over OPAL_VALUE_ARRAY_GET_ITEM() and
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* OPAL_VALUE_ARRAY_SET_ITEM() because it will [potentially] reduce the
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* number of pointer dereferences.
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*/
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#define OPAL_VALUE_ARRAY_GET_BASE(array, item_type) \
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((item_type*) ((array)->array_items))
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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#endif
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