container_multihashmap32.c File Reference

a version of hash map implemented in container_multihashmap.c but with uint32_t as keys More...

#include "gnunet_common.h"
#include "platform.h"
#include "gnunet_util_lib.h"

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Data Structures
union	MapEntry
	Entry in the map. More...
struct	GNUNET_CONTAINER_MultiHashMap32
	Internal representation of the hash map. More...
struct	GNUNET_CONTAINER_MultiHashMap32Iterator
	Cursor into a multihashmap. More...

Macros
#define	LOG(kind, ...)    GNUNET_log_from (kind, "util-container-multihashmap32", __VA_ARGS__)
#define	NEXT_CACHE_SIZE   16
	Maximum recursion depth for callbacks of GNUNET_CONTAINER_multihashmap_get_multiple() themselves again calling GNUNET_CONTAINER_multihashmap_get_multiple(). More...

Functions
struct GNUNET_CONTAINER_MultiHashMap32 *	GNUNET_CONTAINER_multihashmap32_create (unsigned int len)
	Create a multi hash map. More...
void	GNUNET_CONTAINER_multihashmap32_destroy (struct GNUNET_CONTAINER_MultiHashMap32 *map)
	Destroy a hash map. More...
static unsigned int	idx_of (const struct GNUNET_CONTAINER_MultiHashMap32 *m, const uint32_t key)
	Compute the index of the bucket for the given key. More...
unsigned int	GNUNET_CONTAINER_multihashmap32_size (const struct GNUNET_CONTAINER_MultiHashMap32 *map)
	Get the number of key-value pairs in the map. More...
void *	GNUNET_CONTAINER_multihashmap32_get (const struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key)
	Given a key find a value in the map matching the key. More...
int	GNUNET_CONTAINER_multihashmap32_iterate (struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_MultiHashMapIterator32Callback it, void *it_cls)
	Iterate over all entries in the map. More...
static void	update_next_cache (struct GNUNET_CONTAINER_MultiHashMap32 *map, const struct MapEntry *me)
	We are about to free() the me, make sure it is not in the list of next values for any iterator in the map's next_cache. More...
enum GNUNET_GenericReturnValue	GNUNET_CONTAINER_multihashmap32_remove (struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, const void *value)
	Remove the given key-value pair from the map. More...
int	GNUNET_CONTAINER_multihashmap32_remove_all (struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key)
	Remove all entries for the given key from the map. More...
enum GNUNET_GenericReturnValue	GNUNET_CONTAINER_multihashmap32_contains (const struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key)
	Check if the map contains any value under the given key (including values that are NULL). More...
enum GNUNET_GenericReturnValue	GNUNET_CONTAINER_multihashmap32_contains_value (const struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, const void *value)
	Check if the map contains the given value under the given key. More...
static void	grow (struct GNUNET_CONTAINER_MultiHashMap32 *map)
	Grow the given map to a more appropriate size. More...
enum GNUNET_GenericReturnValue	GNUNET_CONTAINER_multihashmap32_put (struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
	Store a key-value pair in the map. More...
int	GNUNET_CONTAINER_multihashmap32_get_multiple (struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, GNUNET_CONTAINER_MultiHashMapIterator32Callback it, void *it_cls)
	Iterate over all entries in the map that match a particular key. More...
struct GNUNET_CONTAINER_MultiHashMap32Iterator *	GNUNET_CONTAINER_multihashmap32_iterator_create (const struct GNUNET_CONTAINER_MultiHashMap32 *map)
	Create an iterator for a multihashmap. More...
enum GNUNET_GenericReturnValue	GNUNET_CONTAINER_multihashmap32_iterator_next (struct GNUNET_CONTAINER_MultiHashMap32Iterator *iter, uint32_t *key, const void **value)
	Retrieve the next element from the hash map at the iterator's position. More...
void	GNUNET_CONTAINER_multihashmap32_iterator_destroy (struct GNUNET_CONTAINER_MultiHashMapIterator *iter)
	Destroy a multihashmap iterator. More...

Detailed Description

a version of hash map implemented in container_multihashmap.c but with uint32_t as keys

Author

Christian Grothoff

Sree Harsha Totakura

Definition in file container_multihashmap32.c.

Macro Definition Documentation

LOG

#define LOG	(		kind,
			...
	)		GNUNET_log_from (kind, "util-container-multihashmap32", __VA_ARGS__)

Definition at line 33 of file container_multihashmap32.c.

NEXT_CACHE_SIZE

#define NEXT_CACHE_SIZE   16

Maximum recursion depth for callbacks of GNUNET_CONTAINER_multihashmap_get_multiple() themselves again calling GNUNET_CONTAINER_multihashmap_get_multiple().

Should be totally excessive, but if violated we die.

Definition at line 43 of file container_multihashmap32.c.

Function Documentation

idx_of()

static unsigned int idx_of ( const struct GNUNET_CONTAINER_MultiHashMap32 *  m, const uint32_t  key  )

static

Compute the index of the bucket for the given key.

Parameters

m	hash map for which to compute the index
key	what key should the index be computed for

Returns

offset into the "map" array of "m"

Definition at line 193 of file container_multihashmap32.c.

{
  GNUNET_assert (NULL != m);
  return ((unsigned int) key) % m->map_length;
}

References GNUNET_assert, key, and m.

Referenced by GNUNET_CONTAINER_multihashmap32_contains(), GNUNET_CONTAINER_multihashmap32_get(), GNUNET_CONTAINER_multihashmap32_get_multiple(), and GNUNET_CONTAINER_multihashmap32_put().

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update_next_cache()

static void update_next_cache ( struct GNUNET_CONTAINER_MultiHashMap32 *  map, const struct MapEntry *  me  )

static

We are about to free() the me, make sure it is not in the list of next values for any iterator in the map's next_cache.

Parameters

map	the map to check
me	the entry that is about to be free'd

Definition at line 271 of file container_multihashmap32.c.

{
  for (unsigned int i = 0; i < map->next_cache_off; i++)
    if (map->next_cache[i] == me)
      map->next_cache[i] = me->next;
}

Referenced by GNUNET_CONTAINER_multihashmap32_contains().

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grow()

static void grow ( struct GNUNET_CONTAINER_MultiHashMap32 *  map )

static

Grow the given map to a more appropriate size.

Parameters

map	the hash map to grow

Definition at line 401 of file container_multihashmap32.c.

{
  struct MapEntry **old_map;
  struct MapEntry **new_map;
  struct MapEntry *e;
  unsigned int old_len;
  unsigned int new_len;
  unsigned int idx;
 
  old_map = map->map;
  old_len = map->map_length;
  new_len = old_len * 2;
  if (0 == new_len) /* 2^31 * 2 == 0 */
    new_len = old_len; /* never use 0 */
  if (new_len == old_len)
    return; /* nothing changed */
  new_map = GNUNET_malloc_large (new_len * sizeof(struct MapEntry *));
  if (NULL == new_map)
    return; /* grow not possible */
  map->modification_counter++;
  map->map_length = new_len;
  map->map = new_map;
  for (unsigned int i = 0; i < old_len; i++)
  {
    while (NULL != (e = old_map[i]))
    {
      old_map[i] = e->next;
      idx = idx_of (map, e->key);
      e->next = new_map[idx];
      new_map[idx] = e;
    }
  }
  GNUNET_free (old_map);
}