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* Copyright (C) 2014 Red Hat Inc, Steven Rostedt <>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* 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; version 2 of the License (not later!)
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* 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, see <>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#ifndef _TRACE_HASH_H
#define _TRACE_HASH_H
#include "trace-hash-local.h"
#include "list.h"
struct trace_hash_item {
struct trace_hash_item *next;
struct trace_hash_item *prev;
unsigned long long key;
struct trace_hash {
struct trace_hash_item **buckets;
int nr_buckets;
int power;
int trace_hash_init(struct trace_hash *hash, int buckets);
void trace_hash_free(struct trace_hash *hash);
int trace_hash_add(struct trace_hash *hash, struct trace_hash_item *item);
int trace_hash_empty(struct trace_hash *hash);
static inline void trace_hash_del(struct trace_hash_item *item)
struct trace_hash_item *prev = item->prev;
prev->next = item->next;
if (item->next)
item->next->prev = prev;
#define trace_hash_for_each_bucket(bucket, hash) \
for (bucket = (hash)->buckets; \
(bucket) < (hash)->buckets + (hash)->nr_buckets; (bucket)++)
#define trace_hash_for_each_item(item, bucket) \
for ((item = *(bucket)); item; item = (item)->next)
#define trace_hash_for_each_item_safe(item, n, bucket) \
for ((item = *(bucket)), n = item ? item->next : NULL; item; \
item = n, n = item ? (item)->next : NULL)
#define trace_hash_while_item(item, bucket) \
while ((item = *(bucket)))
typedef int (*trace_hash_func)(struct trace_hash_item *item, void *data);
struct trace_hash_item *
trace_hash_find(struct trace_hash *hash, unsigned long long key,
trace_hash_func match, void *data);
#endif /* _TRACE_HASH_H */