GNUnet  0.19.2
container_multihashmap32.c File Reference

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

#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_MultiHashMap32GNUNET_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_MulitHashMapIterator32Callback 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...
 
int 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...
 
int 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...
 
int 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...
 
int 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_MulitHashMapIterator32Callback it, void *it_cls)
 Iterate over all entries in the map that match a particular key. More...
 
struct GNUNET_CONTAINER_MultiHashMap32IteratorGNUNET_CONTAINER_multihashmap32_iterator_create (const struct GNUNET_CONTAINER_MultiHashMap32 *map)
 Create an iterator for a multihashmap. More...
 
int 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 32 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 42 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
mhash map for which to compute the index
keywhat key should the index be computed for
Returns
offset into the "map" array of "m"

Definition at line 192 of file container_multihashmap32.c.

193 {
194  GNUNET_assert (NULL != m);
195  return ((unsigned int) key) % m->map_length;
196 }
static struct GNUNET_ARM_MonitorHandle * m
Monitor connection with ARM.
Definition: gnunet-arm.c:104
struct GNUNET_HashCode key
The key used in the DHT.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.

References GNUNET_assert, key, and m.

Referenced by GNUNET_CONTAINER_multihashmap32_contains(), GNUNET_CONTAINER_multihashmap32_contains_value(), GNUNET_CONTAINER_multihashmap32_get(), GNUNET_CONTAINER_multihashmap32_get_multiple(), GNUNET_CONTAINER_multihashmap32_put(), GNUNET_CONTAINER_multihashmap32_remove(), GNUNET_CONTAINER_multihashmap32_remove_all(), and grow().

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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
mapthe map to check
methe entry that is about to be free'd

Definition at line 270 of file container_multihashmap32.c.

272 {
273  for (unsigned int i = 0; i < map->next_cache_off; i++)
274  if (map->next_cache[i] == me)
275  map->next_cache[i] = me->next;
276 }
static GNUNET_NETWORK_STRUCT_END struct GNUNET_PeerIdentity me
Our own peer identity.
static struct GNUNET_CONTAINER_MultiPeerMap * map
Handle to the map used to store old latency values for peers.
unsigned int next_cache_off
Offset of next_cache entries in use, must be smaller than NEXT_CACHE_SIZE.
union MapEntry next_cache[16]
Map entries indicating iteration positions currently in use by GNUNET_CONTAINER_multihashmap_get_mult...

References map, me, GNUNET_CONTAINER_MultiPeerMap::next_cache, and GNUNET_CONTAINER_MultiPeerMap::next_cache_off.

Referenced by GNUNET_CONTAINER_multihashmap32_remove(), and GNUNET_CONTAINER_multihashmap32_remove_all().

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◆ grow()

static void grow ( struct GNUNET_CONTAINER_MultiHashMap32 map)
static

Grow the given map to a more appropriate size.

Parameters
mapthe hash map to grow

Definition at line 400 of file container_multihashmap32.c.

401 {
402  struct MapEntry **old_map;
403  struct MapEntry **new_map;
404  struct MapEntry *e;
405  unsigned int old_len;
406  unsigned int new_len;
407  unsigned int idx;
408 
409  old_map = map->map;
410  old_len = map->map_length;
411  new_len = old_len * 2;
412  if (0 == new_len) /* 2^31 * 2 == 0 */
413  new_len = old_len; /* never use 0 */
414  if (new_len == old_len)
415  return; /* nothing changed */
416  new_map = GNUNET_malloc_large (new_len * sizeof(struct MapEntry *));
417  if (NULL == new_map)
418  return; /* grow not possible */
420  map->map_length = new_len;
421  map->map = new_map;
422  for (unsigned int i = 0; i < old_len; i++)
423  {
424  while (NULL != (e = old_map[i]))
425  {
426  old_map[i] = e->next;
427  idx = idx_of (map, e->key);
428  e->next = new_map[idx];
429  new_map[idx] = e;
430  }
431  }
432  GNUNET_free (old_map);
433 }
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.
static struct Experiment * e
#define GNUNET_malloc_large(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
unsigned int map_length
Length of the "map" array.
unsigned int modification_counter
Counts the destructive modifications (grow, remove) to the map, so that iterators can check if they a...
union MapEntry * map
All of our buckets.
Entry in the map.

References e, GNUNET_free, GNUNET_malloc_large, idx_of(), map, GNUNET_CONTAINER_MultiPeerMap::map, GNUNET_CONTAINER_MultiPeerMap::map_length, and GNUNET_CONTAINER_MultiPeerMap::modification_counter.

Referenced by GNUNET_CONTAINER_multihashmap32_put().

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