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/* utility routines for keeping conters about events and the event rates */
/* (C) 2015 by Sysmocom s.f.m.c. GmbH
* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/*! \addtogroup stat_item
* @{
*/
/*! \file stat_item.c */
#include <stdint.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/stat_item.h>
static LLIST_HEAD(stat_item_groups);
static void *tall_stat_item_ctx;
/*! \brief Allocate a new group of counters according to description
* \param[in] ctx \ref talloc context
* \param[in] desc Statistics item group description
* \param[in] idx Index of new stat item group
*/
struct stat_item_group *stat_item_group_alloc(void *ctx,
const struct stat_item_group_desc *desc,
unsigned int idx)
{
unsigned int group_size;
unsigned int items_size = 0;
unsigned int item_idx;
void *items;
struct stat_item_group *group;
group_size = sizeof(struct stat_item_group) +
desc->num_items * sizeof(struct stat_item *);
if (!ctx)
ctx = tall_stat_item_ctx;
group = talloc_zero_size(ctx, group_size);
if (!group)
return NULL;
group->desc = desc;
group->idx = idx;
/* Get combined size of all items */
for (item_idx = 0; item_idx < desc->num_items; item_idx++) {
unsigned int size;
size = sizeof(struct stat_item) +
sizeof(int32_t) * desc->item_desc[item_idx].num_values;
/* Align to pointer size */
size = (size + sizeof(void *) - 1) & ~(sizeof(void *) - 1);
/* Store offsets into the item array */
group->items[item_idx] = (void *)items_size;
items_size += size;
}
items = talloc_zero_size(group, items_size);
if (!items) {
talloc_free(group);
return NULL;
}
/* Update item pointers */
for (item_idx = 0; item_idx < desc->num_items; item_idx++) {
struct stat_item *item = (struct stat_item *)
((uint8_t *)items + (int)group->items[item_idx]);
unsigned int i;
group->items[item_idx] = item;
item->last_offs = desc->item_desc[item_idx].num_values - 1;
item->last_value_index = -1;
item->desc = &desc->item_desc[item_idx];
for (i = 0; i <= item->last_offs; i++)
item->values[i] = desc->item_desc[item_idx].default_value;
}
llist_add(&group->list, &stat_item_groups);
return group;
}
/*! \brief Free the memory for the specified group of counters */
void stat_item_group_free(struct stat_item_group *grp)
{
llist_del(&grp->list);
talloc_free(grp);
}
void stat_item_set(struct stat_item *item, int32_t value)
{
item->last_offs += 1;
if (item->last_offs >= item->desc->num_values)
item->last_offs = 0;
item->last_value_index += 1;
item->values[item->last_offs] = value;
}
int stat_item_get_next(const struct stat_item *item, int32_t *next_idx,
int32_t *value)
{
int32_t delta = item->last_value_index + 1 - *next_idx;
int n_values = 0;
int next_offs;
if (delta == 0)
/* All items have been read */
return 0;
if (delta < 0 || delta > item->desc->num_values) {
n_values = delta - item->desc->num_values;
delta = item->desc->num_values;
}
next_offs = item->last_offs + 1 - delta;
if (next_offs < 0)
next_offs += item->desc->num_values;
*value = item->values[next_offs];
n_values += 1;
delta -= 1;
*next_idx = item->last_value_index + 1 - delta;
return n_values;
}
/*! \brief Skip all values and update idx accordingly */
int stat_item_discard(const struct stat_item *item, int32_t *idx)
{
int discarded = item->last_value_index + 1 - *idx;
*idx = item->last_value_index + 1;
return discarded;
}
/*! \brief Initialize the stat item module */
int stat_item_init(void *tall_ctx)
{
tall_stat_item_ctx = tall_ctx;
return 0;
}
/*! \brief Search for item group based on group name and index */
struct stat_item_group *stat_item_get_group_by_name_idx(
const char *name, const unsigned int idx)
{
struct stat_item_group *statg;
llist_for_each_entry(statg, &stat_item_groups, list) {
if (!statg->desc)
continue;
if (!strcmp(statg->desc->group_name_prefix, name) &&
statg->idx == idx)
return statg;
}
return NULL;
}
/*! \brief Search for item group based on group name */
const struct stat_item *stat_item_get_by_name(
const struct stat_item_group *statg, const char *name)
{
int i;
const struct stat_item_desc *item_desc;
if (!statg->desc)
return NULL;
for (i = 0; i < statg->desc->num_items; i++) {
item_desc = &statg->desc->item_desc[i];
if (!strcmp(item_desc->name, name)) {
return statg->items[i];
}
}
return NULL;
}
/*! @} */
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