mirror of https://gerrit.osmocom.org/libosmocore
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/*! \file counter.c
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* utility routines for keeping some statistics. */
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/*
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* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <string.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/counter.h>
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static LLIST_HEAD(counters);
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/*! Global talloc context for all osmo_counter allocations. */
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void *tall_ctr_ctx;
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/*! Allocate a new counter with given name. Allocates from tall_ctr_ctx
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* \param[in] name Human-readable string name for the counter
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* \returns Allocated counter on success; NULL on error */
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struct osmo_counter *osmo_counter_alloc(const char *name)
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{
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struct osmo_counter *ctr = talloc_zero(tall_ctr_ctx, struct osmo_counter);
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if (!ctr)
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return NULL;
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ctr->name = name;
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llist_add_tail(&ctr->list, &counters);
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return ctr;
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}
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/*! Release/Destroy a given counter
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* \param[in] ctr Counter to be destroyed */
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void osmo_counter_free(struct osmo_counter *ctr)
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{
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llist_del(&ctr->list);
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talloc_free(ctr);
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}
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/*! Iterate over all counters; call \a handle_cunter call-back for each.
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* \param[in] handle_counter Call-back to be called for each counter; aborts if rc < 0
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* \param[in] data Opaque data passed through to \a handle_counter function
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* \returns 0 if all \a handle_counter calls successfull; negative on error */
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int osmo_counters_for_each(int (*handle_counter)(struct osmo_counter *, void *),
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void *data)
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{
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struct osmo_counter *ctr;
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int rc = 0;
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llist_for_each_entry(ctr, &counters, list) {
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rc = handle_counter(ctr, data);
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if (rc < 0)
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return rc;
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}
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return rc;
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}
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/*! Counts the registered counter
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* \returns amount of counters */
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int osmo_counters_count()
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{
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return llist_count(&counters);
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}
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/*! Find a counter by its name.
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* \param[in] name Name used to look-up/search counter
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* \returns Counter on success; NULL if not found */
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struct osmo_counter *osmo_counter_get_by_name(const char *name)
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{
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struct osmo_counter *ctr;
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llist_for_each_entry(ctr, &counters, list) {
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if (!strcmp(ctr->name, name))
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return ctr;
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}
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return NULL;
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}
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/*! Compute difference between current and previous counter value.
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* \param[in] ctr Counter of which the difference is to be computed
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* \returns Delta value between current counter and previous counter. Please
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* note that the actual counter values are unsigned long, while the
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* difference is computed as signed integer! */
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int osmo_counter_difference(struct osmo_counter *ctr)
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{
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int delta = ctr->value - ctr->previous;
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ctr->previous = ctr->value;
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return delta;
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}
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