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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2007 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2015 Los Alamos National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/**
* @file
*
* Implementation of opal_object_t, the base opal foundation class
*/
#include "opal_config.h"
#include <stdio.h>
#include "opal/class/opal_object.h"
#include "opal/constants.h"
#include "opal/sys/atomic.h"
/*
* Instantiation of class descriptor for the base class. This is
* special, since be mark it as already initialized, with no parent
* and no constructor or destructor.
*/
opal_class_t opal_object_t_class = {
"opal_object_t", /* name */
NULL, /* parent class */
NULL, /* constructor */
NULL, /* destructor */
1, /* initialized -- this class is preinitialized */
0, /* class hierarchy depth */
NULL, /* array of constructors */
NULL, /* array of destructors */
sizeof(opal_object_t) /* size of the opal object */
};
int opal_class_init_epoch = 1;
/*
* Local variables
*/
static opal_atomic_lock_t class_lock = OPAL_ATOMIC_LOCK_INIT;
static void **classes = NULL;
static int num_classes = 0;
static int max_classes = 0;
static const int increment = 10;
/*
* Local functions
*/
static void save_class(opal_class_t *cls);
static void expand_array(void);
/*
* Lazy initialization of class descriptor.
*/
void opal_class_initialize(opal_class_t *cls)
{
opal_class_t *c;
opal_construct_t *cls_construct_array;
opal_destruct_t *cls_destruct_array;
int cls_construct_array_count;
int cls_destruct_array_count;
int i;
assert(cls);
/* Check to see if any other thread got in here and initialized
this class before we got a chance to */
if (opal_class_init_epoch == cls->cls_initialized) {
return;
}
opal_atomic_lock(&class_lock);
/* If another thread initializing this same class came in at
roughly the same time, it may have gotten the lock and
initialized. So check again. */
if (opal_class_init_epoch == cls->cls_initialized) {
opal_atomic_unlock(&class_lock);
return;
}
/*
* First calculate depth of class hierarchy
* And the number of constructors and destructors
*/
cls->cls_depth = 0;
cls_construct_array_count = 0;
cls_destruct_array_count = 0;
for (c = cls; c; c = c->cls_parent) {
if (NULL != c->cls_construct) {
cls_construct_array_count++;
}
if (NULL != c->cls_destruct) {
cls_destruct_array_count++;
}
cls->cls_depth++;
}
/*
* Allocate arrays for hierarchy of constructors and destructors
* plus for each a NULL-sentinel
*/
cls->cls_construct_array = (void (**)(opal_object_t *)) malloc(
(cls_construct_array_count + cls_destruct_array_count + 2) * sizeof(opal_construct_t));
if (NULL == cls->cls_construct_array) {
perror("Out of memory");
exit(-1);
}
cls->cls_destruct_array = cls->cls_construct_array + cls_construct_array_count + 1;
/*
* The constructor array is reversed, so start at the end
*/
cls_construct_array = cls->cls_construct_array + cls_construct_array_count;
cls_destruct_array = cls->cls_destruct_array;
c = cls;
*cls_construct_array = NULL; /* end marker for the constructors */
for (i = 0; i < cls->cls_depth; i++) {
if (NULL != c->cls_construct) {
--cls_construct_array;
*cls_construct_array = c->cls_construct;
}
if (NULL != c->cls_destruct) {
*cls_destruct_array = c->cls_destruct;
cls_destruct_array++;
}
c = c->cls_parent;
}
*cls_destruct_array = NULL; /* end marker for the destructors */
cls->cls_initialized = opal_class_init_epoch;
save_class(cls);
/* All done */
opal_atomic_unlock(&class_lock);
}
/*
* Note that this is finalize for *all* classes.
*/
int opal_class_finalize(void)
{
int i;
if (INT_MAX == opal_class_init_epoch) {
opal_class_init_epoch = 1;
} else {
opal_class_init_epoch++;
}
if (NULL != classes) {
for (i = 0; i < num_classes; ++i) {
if (NULL != classes[i]) {
free(classes[i]);
}
}
free(classes);
classes = NULL;
num_classes = 0;
max_classes = 0;
}
return OPAL_SUCCESS;
}
static void save_class(opal_class_t *cls)
{
if (num_classes >= max_classes) {
expand_array();
}
classes[num_classes] = cls->cls_construct_array;
++num_classes;
}
static void expand_array(void)
{
int i;
max_classes += increment;
classes = (void **) realloc(classes, sizeof(opal_class_t *) * max_classes);
if (NULL == classes) {
perror("class malloc failed");
exit(-1);
}
for (i = num_classes; i < max_classes; ++i) {
classes[i] = NULL;
}
}
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