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/* reference counting, for libreswan
*
* Copyright (C) 2015-2019 Andrew Cagney <cagney@gnu.org>
*
* 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. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*/
#include <pthread.h>
#include "refcnt.h"
#include "lswlog.h" /* for DBG*() et.al. */
static pthread_mutex_t refcnt_mutex = PTHREAD_MUTEX_INITIALIZER;
static void ldbg_ref(const struct logger *logger,
const struct logger *owner,
const char *why, const char *what,
const void *pointer, where_t where,
int old_count, int new_count)
{
if (DBGP(DBG_REFCNT)) {
LLOG_JAMBUF(DEBUG_STREAM, &global_logger, buf) {
if (logger == NULL) {
jam_string(buf, what);
jam_string(buf, ": ");
} else {
jam_logger_prefix(buf, logger);
}
jam(buf, "%sref @%p(%u->%u)",
why, pointer, old_count, new_count);
if (owner != NULL) {
jam_string(buf, " ");
jam_logger_prefix(buf, owner);
}
jam_string(buf, " ");
jam_where(buf, where);
}
}
}
#define LDBG_REF(WHY) \
ldbg_ref(logger, owner, WHY, refcnt->base->what, pointer, where, old, new)
/*
* So existing code can use the refcnt tracer.
*/
void ldbg_alloc(const struct logger *new_owner, const char *what, const void *pointer, where_t where)
{
ldbg_ref(NULL, new_owner, "new", what, pointer, where, 0, 1);
}
void ldbg_free(const struct logger *logger, const char *what, const void *pointer, where_t where)
{
ldbg_ref(logger, NULL, "del", what, pointer, where, 1, 0);
}
void ldbg_addref_where(const struct logger *logger, const char *what,
const void *pointer, where_t where)
{
if (DBGP(DBG_REFCNT)) {
LDBG_log(logger, "addref %s@%p "PRI_WHERE,
what, pointer, pri_where(where));
}
}
void ldbg_delref_where(const struct logger *logger, const char *what,
const void *pointer, where_t where)
{
if (DBGP(DBG_REFCNT)) {
LDBG_log(logger, "delref %s@%p "PRI_WHERE,
what, pointer, pri_where(where));
}
}
void dbg_alloc(const char *what, const void *pointer, where_t where)
{
ldbg_alloc(NULL, what, pointer, where);
}
void dbg_free(const char *what, const void *pointer, where_t where)
{
ldbg_free(NULL, what, pointer, where);
}
/* -- */
void refcnt_init(const void *pointer, struct refcnt *refcnt,
const struct refcnt_base *base,
const struct where *where)
{
unsigned old, new;
pthread_mutex_lock(&refcnt_mutex);
{
old = refcnt->count;
refcnt->count++;
refcnt->base = base;
new = refcnt->count;
}
pthread_mutex_unlock(&refcnt_mutex);
if (old != 0 || new != 1) {
llog_passert(&global_logger, where,
"%s() %s@%p should have been 0 initialized",
__func__, base->what, pointer);
}
ldbg_ref(NULL, NULL, "new", base->what, pointer, where, old, new);
}
void refcnt_addref_where(const char *what,
const void *pointer,
refcnt_t *refcnt,
const struct logger *logger,
const struct logger *owner,
where_t where)
{
unsigned old, new;
pthread_mutex_lock(&refcnt_mutex);
{
old = refcnt->count;
refcnt->count++;
new = refcnt->count;
}
pthread_mutex_unlock(&refcnt_mutex);
if (old == 0) {
llog_passert((logger == NULL ? &global_logger : logger), where,
"%s() refcnt for %s@%p should have been non-0",
__func__, what, pointer);
}
LDBG_REF("add");
}
/*
* look at refcnt atomically
* This is a bit slow but it is used rarely.
*/
unsigned refcnt_peek_where(const void *pointer,
const refcnt_t *refcnt,
const struct logger *logger,
where_t where)
{
unsigned val;
pthread_mutex_lock(&refcnt_mutex);
{
val = refcnt->count;
}
pthread_mutex_unlock(&refcnt_mutex);
ldbg_ref(logger, /*owner*/NULL, "peek", /*what*/NULL, pointer, where, val, val);
return val;
}
void *refcnt_delref_where(const char *what, void *pointer,
struct refcnt *refcnt,
const struct logger *logger,
const struct logger *owner,
const struct where *where)
{
/* on main thread */
unsigned old, new;
pthread_mutex_lock(&refcnt_mutex);
{
old = refcnt->count;
if (old > 0) {
refcnt->count--;
}
new = refcnt->count;
}
pthread_mutex_unlock(&refcnt_mutex);
if (old == 0) {
llog_passert((logger == NULL ? &global_logger : logger), where,
"%s() refcnt for %s@%p should have been non-0",
__func__, what, pointer);
}
LDBG_REF("del");
if (new == 0) {
return pointer;
}
return NULL;
}
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