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/*! \file counter.c
* utility routines for keeping some statistics. */
/*
* (C) 2009,2019 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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.
*
*/
#include <string.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/counter.h>
static LLIST_HEAD(counters);
/*! Global talloc context for all osmo_counter allocations. */
void *tall_ctr_ctx;
/*! Allocate a new counter with given name. Allocates from tall_ctr_ctx
* \param[in] name Human-readable string name for the counter
* \returns Allocated counter on success; NULL on error */
struct osmo_counter *osmo_counter_alloc(const char *name)
{
struct osmo_counter *ctr;
if (!tall_ctr_ctx)
tall_ctr_ctx = talloc_named_const(OTC_GLOBAL, 0, "osmo_counter");
ctr = talloc_zero(tall_ctr_ctx, struct osmo_counter);
if (!ctr)
return NULL;
ctr->name = name;
llist_add_tail(&ctr->list, &counters);
return ctr;
}
/*! Release/Destroy a given counter
* \param[in] ctr Counter to be destroyed */
void osmo_counter_free(struct osmo_counter *ctr)
{
llist_del(&ctr->list);
talloc_free(ctr);
}
/*! Iterate over all counters; call \a handle_cunter call-back for each.
* \param[in] handle_counter Call-back to be called for each counter; aborts if rc < 0
* \param[in] data Opaque data passed through to \a handle_counter function
* \returns 0 if all \a handle_counter calls successfull; negative on error */
int osmo_counters_for_each(int (*handle_counter)(struct osmo_counter *, void *),
void *data)
{
struct osmo_counter *ctr;
int rc = 0;
llist_for_each_entry(ctr, &counters, list) {
rc = handle_counter(ctr, data);
if (rc < 0)
return rc;
}
return rc;
}
/*! Counts the registered counter
* \returns amount of counters */
int osmo_counters_count()
{
return llist_count(&counters);
}
/*! Find a counter by its name.
* \param[in] name Name used to look-up/search counter
* \returns Counter on success; NULL if not found */
struct osmo_counter *osmo_counter_get_by_name(const char *name)
{
struct osmo_counter *ctr;
llist_for_each_entry(ctr, &counters, list) {
if (!strcmp(ctr->name, name))
return ctr;
}
return NULL;
}
/*! Compute difference between current and previous counter value.
* \param[in] ctr Counter of which the difference is to be computed
* \returns Delta value between current counter and previous counter. Please
* note that the actual counter values are unsigned long, while the
* difference is computed as signed integer! */
int osmo_counter_difference(struct osmo_counter *ctr)
{
int delta = ctr->value - ctr->previous;
ctr->previous = ctr->value;
return delta;
}
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