memcached_generate_hash - Man Page

Name

memcached_generate_hash ā€” Generating hash values directly

Hash a key value

Synopsis

#include <libmemcached/memcached.h>

Compile and link with -lmemcachedutil -lmemcached

uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash_t hash_algorithm)
Parameters
  • key -- the key to generate a hash of
  • key_length -- the length of the key without any terminating zero
  • hash_algorithm -- memcached_hash_t, the algorithm to use
Returns

a 32 bit hash value

uint32_t memcached_generate_hash(memcached_st *ptr, const char *key, size_t key_length)
Parameters
  • ptr -- pointer to an initialized memcached_st struct
  • key -- the key to generate a hash of
  • key_length -- the length of the key without any terminating zero
Returns

a 32 bit hash value

typedef enum memcached_hash_t memcached_hash_t

enum memcached_hash_t

enumerator MEMCACHED_HASH_DEFAULT

enumerator MEMCACHED_HASH_MD5

enumerator MEMCACHED_HASH_CRC

enumerator MEMCACHED_HASH_FNV1_64

enumerator MEMCACHED_HASH_FNV1A_64

enumerator MEMCACHED_HASH_FNV1_32

enumerator MEMCACHED_HASH_FNV1A_32

enumerator MEMCACHED_HASH_HSIEH

enumerator MEMCACHED_HASH_MURMUR

enumerator MEMCACHED_HASH_JENKINS

enumerator MEMCACHED_HASH_MURMUR3

enumerator MEMCACHED_HASH_CUSTOM

Description

memcached_generate_hash_value() allows you to hash a key using one of the hash functions defined in the library. This method is provided for the convenience of higher-level language bindings and is not necessary for normal memcache operations.

Support for MEMCACHED_HASH_HSIEH is a compile time option that is disabled by default. To enable tests for this hashing algorithm, configure and build libmemcached with the Hsieh hash enabled.

memcached_generate_hash() takes a memcached_st structure and produces the hash value that would have been generated based on the defaults of memcached_st.

As of version 0.36 all hash methods have been placed into the library libhashkit(3) which is linked with libmemcached(3). For more information please see its documentation.

Return Value

A 32-bit integer which is the result of hashing the given key. For 64-bit hash algorithms, only the least-significant 32 bits are returned.

See Also

memcached(1) libmemcached(3) memcached_strerror(3)

Info

Sep 20, 2021 1.1 libmemcached-awesome