hashkit_set_function(3)

1HASHKIT_SET_FUNCTION(3)      libmemcached-awesome      HASHKIT_SET_FUNCTION(3)
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NAME

6       hashkit_set_function - libhashkit Documentation
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SYNOPSIS

9       #include <libhashkit-1.0/hashkit.h>
10              Compile and link with -lhashkit
11
12       typedef uint32_t (*hashkit_hash_fn)(const char *key, size_t key_length,
13       void *context)
14
15              Param key
16                     the key to generate a hash of
17
18              Param key_length
19                     the length of the key without any terminating zero byte
20
21              Param context
22                     the   custom   hash   function   context   set    through
23                     hashkit_set_custom_function()                          or
24                     hashkit_set_custom_distribution_function()
25
26              Returns
27                     the custom hash function should return a hash  value  for
28                     key as an unsigned 32bit integer
29
30       typedef enum hashkit_return_t hashkit_return_t
31
32       enum hashkit_return_t
33
34              enumerator HASHKIT_SUCCESS
35                     Operation succeeded.
36
37              enumerator HASHKIT_FAILURE
38                     Operation failed.
39
40              enumerator HASHKIT_MEMORY_ALLOCATION_FAILURE
41                     Memory allocation failed.
42
43              enumerator HASHKIT_INVALID_HASH
44                     Invalid hashkit_hash_algorithm_t passed.
45
46              enumerator HASHKIT_INVALID_ARGUMENT
47                     Invalid argument passed.
48
49       typedef enum hashkit_hash_algorithm_t hashkit_hash_algorithm_t
50
51       enum hashkit_hash_algorithm_t
52
53              enumerator HASHKIT_HASH_DEFAULT
54                     Default hash algorithm (one_at_a_time).
55
56              enumerator HASHKIT_HASH_MD5
57
58              enumerator HASHKIT_HASH_CRC
59
60              enumerator HASHKIT_HASH_FNV1_64
61
62              enumerator HASHKIT_HASH_FNV1A_64
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64              enumerator HASHKIT_HASH_FNV1_32
65
66              enumerator HASHKIT_HASH_FNV1A_32
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68              enumerator HASHKIT_HASH_HSIEH
69                     Only  available  if libhashkit hash been built with HSIEH
70                     support.
71
72              enumerator HASHKIT_HASH_MURMUR
73                     Only available if libhashkit has been built  with  MURMUR
74                     support.
75
76              enumerator HASHKIT_HASH_MURMUR3
77                     Only  available  if libhashkit has been built with MURMUR
78                     support.
79
80              enumerator HASHKIT_HASH_JENKINS
81
82              enumerator HASHKIT_HASH_CUSTOM
83                     Use   custom   hashkit_hash_fn   function   set   through
84                     hashkit_set_custom_function()                          or
85                     hashkit_set_custom_distribution_function().
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87       hashkit_return_t         hashkit_set_function(hashkit_st         *hash,
88       hashkit_hash_algorithm_t hash_algorithm)
89
90              Parameters
91
92                     • hash -- pointer to an initialized hashkit_st struct
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94                     • hash_algorithm  --  valid hashkit_hash_algorithm_t con‐
95                       stant
96
97              Returns
98                     hashkit_return_t indicating success or failure
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100       hashkit_return_t     hashkit_set_custom_function(hashkit_st      *hash,
101       hashkit_hash_fn function, void *context)
102
103              Parameters
104
105                     • hash -- pointer to initialized hashkit_st struct
106
107                     • function  -- hashkit_hash_fn function pointer to use as
108                       hash function for HASHKIT_HASH_CUSTOM
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110                     • context -- pointer to an opaque  user  managed  context
111                       for the custom hash function
112
113              Returns
114                     hashkit_return_t indicating success or failure
115
116       hashkit_hash_algorithm_t hashkit_get_function(const hashkit_st *hash)
117
118              Parameters
119                     hash -- pointer to an initialized hashkit_st struct
120
121              Returns
122                     hashkit_hash_algorithm_t  indicating  the  currently  set
123                     hash algorithm to use
124
125       hashkit_return_t  hashkit_set_distribution_function(hashkit_st   *hash,
126       hashkit_hash_algorithm_t hash_algorithm)
127
128              Parameters
129
130                     • hash -- pointer to an initialized hashkit_st struct
131
132                     • hash_algorithm  --  valid  hashkit_hash_algrothm_t con‐
133                       stant
134
135              Returns
136                     hashkit_return_t indicating success or failure
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138       hashkit_return_t    hashkit_set_custom_distribution_function(hashkit_st
139       *hash, hashkit_hash_fn function, void *context)
140
141              Parameters
142
143                     • hash -- pointer to initialized hashkit_st struct
144
145                     • function  -- hashkit_hash_fn function pointer to use as
146                       distribution hash function for HASHKIT_HASH_CUSTOM
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148                     • context -- pointer to an opaque  user  managed  context
149                       for the custom distribution hash function
150
151       hashkit_hash_algorithm_t        hashkit_get_distribution_function(const
152       hashkit_st *hash)
153
154              Parameters
155                     hash -- pointer to an initialized hashkit_st struct
156
157              Returns
158                     hashkit_hash_algorithm_t  indicating  the  currently  set
159                     distribution hash algorithm to use
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DESCRIPTION

162       These  functions  are used to set and retrieve the key and distribution
163       hash functions.
164

RETURN VALUE

166       hashkit_set_function(), hashkit_set_custom_function() and the distribu‐
167       tion equivalents return hashkit_return_t::HASHKIT_SUCCESS on success.
168
169       hashkit_get_function()  and  hashkit_get_distribution_function() return
170       hashkit_hash_algorithm_t indicating the hash function used.
171

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

SEE ALSO