175 строки
4.9 KiB
C
175 строки
4.9 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2006 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* 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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/** @file
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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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* Utility functions to manage fortran <-> c opaque object
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* translation. Note that since MPI defines fortran handles as
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* [signed] int's, we use int everywhere in here where you would
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* normally expect size_t. There's some code that makes sure indices
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* don't go above FORTRAN_HANDLE_MAX (which is min(INT_MAX, fortran
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* INTEGER max)), just to be sure.
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*/
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#ifndef OMPI_POINTER_ARRAY_H
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#define OMPI_POINTER_ARRAY_H
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#include "ompi_config.h"
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#include "opal/threads/mutex.h"
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#include "opal/class/opal_object.h"
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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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/**
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* dynamic pointer array
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*/
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struct ompi_pointer_array_t {
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/** base class */
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opal_object_t super;
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/** synchronization object */
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opal_mutex_t lock;
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/** Index of lowest free element. NOTE: This is only an
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optimization to know where to search for the first free slot.
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It does \em not necessarily imply indices all above this index
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are not taken! */
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int lowest_free;
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/** number of free elements in the list */
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int number_free;
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/** size of list, i.e. number of elements in addr */
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int size;
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/** pointer to array of pointers */
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void **addr;
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};
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/**
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* Convenience typedef
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*/
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typedef struct ompi_pointer_array_t ompi_pointer_array_t;
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/**
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* Class declaration
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*/
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OMPI_DECLSPEC OBJ_CLASS_DECLARATION(ompi_pointer_array_t);
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/**
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* Add a pointer to the array (Grow the array, if need be)
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*
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* @param array Pointer to array (IN)
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* @param ptr Pointer value (IN)
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*
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* @return Index of inserted array element. Return value of
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* (-1) indicates an error.
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*/
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OMPI_DECLSPEC int ompi_pointer_array_add(ompi_pointer_array_t *array, void *ptr);
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/**
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* Set the value of an element in array
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*
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* @param array Pointer to array (IN)
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* @param index Index of element to be reset (IN)
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* @param value New value to be set at element index (IN)
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*
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* @return Error code. (-1) indicates an error.
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*/
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OMPI_DECLSPEC int ompi_pointer_array_set_item(ompi_pointer_array_t *array,
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int index, void *value);
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/**
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* Get the value of an element in array
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*
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* @param array Pointer to array (IN)
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* @param index Index of element to be returned (IN)
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*
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* @return Error code. NULL indicates an error.
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*/
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static inline void *ompi_pointer_array_get_item(ompi_pointer_array_t *table,
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int index)
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{
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void *p;
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if( table->size <= index ) {
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return NULL;
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}
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OPAL_THREAD_LOCK(&(table->lock));
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p = table->addr[index];
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OPAL_THREAD_UNLOCK(&(table->lock));
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return p;
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}
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/**
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* Get the size of the pointer array
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*
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* @param array Pointer to array (IN)
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*
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* @returns size Size of the array
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*
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* Simple inline function to return the size of the array in order to
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* hide the member field from external users.
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*/
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static inline int ompi_pointer_array_get_size(ompi_pointer_array_t *array)
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{
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return array->size;
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}
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/**
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* Test whether a certain element is already in use. If not yet
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* in use, reserve it.
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*
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* @param array Pointer to array (IN)
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* @param index Index of element to be tested (IN)
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* @param value New value to be set at element index (IN)
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*
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* @return true/false True if element could be reserved
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* False if element could not be reserved (e.g., in use).
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*
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* In contrary to array_set, this function does not allow to overwrite
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* a value, unless the previous value is NULL ( equiv. to free ).
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*/
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OMPI_DECLSPEC bool ompi_pointer_array_test_and_set_item (ompi_pointer_array_t *table,
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int index,
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void *value);
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/**
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* Empty the array.
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*
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* @param array Pointer to array (IN)
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*
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*/
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static inline void ompi_pointer_array_remove_all(ompi_pointer_array_t *array)
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{
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int i;
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OPAL_THREAD_LOCK(&array->lock);
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array->lowest_free = 0;
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array->number_free = array->size;
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for(i=0; i<array->size; i++) {
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array->addr[i] = NULL;
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}
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OPAL_THREAD_UNLOCK(&array->lock);
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}
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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#endif /* OMPI_POINTER_ARRAY_H */
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