1ck_pr_cas(3) BSD Library Functions Manual ck_pr_cas(3)
2
4 ck_pr_cas_ptr, ck_pr_cas_ptr_value, ck_pr_cas_ptr_2,
5 ck_pr_cas_ptr_2_value, ck_pr_cas_double, ck_pr_cas_double_value,
6 ck_pr_cas_char, ck_pr_cas_char_value, ck_pr_cas_uint,
7 ck_pr_cas_uint_value, ck_pr_cas_int, ck_pr_cas_int_value, ck_pr_cas_64_2,
8 ck_pr_cas_64_2_value, ck_pr_cas_64, ck_pr_cas_64_value, ck_pr_cas_32,
9 ck_pr_cas_32_value, ck_pr_cas_16, ck_pr_cas_16_value, ck_pr_cas_8,
10 ck_pr_cas_8_value — atomic compare-and-swap operations
11
13 Concurrency Kit (libck, -lck)
14
16 #include <ck_pr.h>
17 bool
19 ck_pr_cas_ptr(void *target, void *old_value, void *new_value);
20 bool
22 ck_pr_cas_ptr_value(void *target, void *old_value, void *new_value,
23 void *original_value);
24 bool
26 ck_pr_cas_ptr_2(void *target, void *old_value, void *new_value);
27 bool
29 ck_pr_cas_ptr_2_value(void *target, void *old_value, void *new_value,
30 void *original_value);
31 bool
33 ck_pr_cas_double(double *target, double old_value, double new_value);
34 bool
36 ck_pr_cas_double_value(double *target, double old_value,
37 double new_value, double *original_value);
38 bool
40 ck_pr_cas_char(char *target, char old_value, char new_value);
41 bool
43 ck_pr_cas_char_value(char *target, char old_value, char new_value,
44 char *original_value);
45 bool
47 ck_pr_cas_uint(unsigned int *target, unsigned int old_value,
48 unsigned int new_value);
49 bool
51 ck_pr_cas_uint_value(unsigned int *target, unsigned int old_value,
52 unsigned int new_value, unsigned int *original_value);
53 bool
55 ck_pr_cas_int(int *target, int old_value, int new_value);
56 bool
58 ck_pr_cas_int_value(int *target, int old_value, int new_value,
59 int *original_value);
60 bool
62 ck_pr_cas_64_2(uint64_t target[static 2], uint64_t old_value[static 2],
63 uint64_t new_value[static 2]);
64 bool
66 ck_pr_cas_64_2_value(uint64_t target[static 2],
67 uint64_t old_value[static 2], uint64_t new_value[static 2],
68 uint64_t original_value[static 2]);
69 bool
71 ck_pr_cas_64(uint64_t *target, uint64_t old_value, uint64_t new_value);
72 bool
74 ck_pr_cas_64_value(uint64_t *target, uint64_t old_value,
75 uint64_t new_value, uint64_t *original_value);
76 bool
78 ck_pr_cas_32(uint32_t *target, uint32_t old_value, uint32_t new_value);
79 bool
81 ck_pr_cas_32_value(uint32_t *target, uint32_t old_value,
82 uint32_t new_value, uint32_t *original_value);
83 bool
85 ck_pr_cas_16(uint16_t *target, uint16_t old_value, uint16_t new_value);
86 bool
88 ck_pr_cas_16_value(uint16_t *target, uint16_t old_value,
89 uint16_t new_value, uint16_t *original_value);
90 bool
92 ck_pr_cas_8(uint8_t *target, uint8_t old_value, uint8_t new_value);
93 bool
95 ck_pr_cas_8_value(uint8_t *target, uint8_t old_value, uint8_t new_value,
96 uint8_t *original_value);
97
99 The ck_pr_cas(3) family of functions atomically compare the value in
100 target for equality with old_value and if so, replace the value pointed
101 to by target with the value specified by new_value. If the value in
102 target was not equal to the value specified by old_value then no modifi‐
103 cations occur to the value in target. The *_value form of these func‐
104 tions unconditionally update original_value.
105
107 This family of functions return true if the value in target was modified
108 as a result of the operation. Otherwise, they return false.
109
111 ck_pr_fence_load(3), ck_pr_fence_load_depends(3), ck_pr_fence_store(3),
112 ck_pr_fence_memory(3), ck_pr_load(3), ck_pr_store(3), ck_pr_fas(3),
113 ck_pr_faa(3), ck_pr_inc(3), ck_pr_dec(3), ck_pr_neg(3), ck_pr_not(3),
114 ck_pr_sub(3), ck_pr_and(3), ck_pr_or(3), ck_pr_xor(3), ck_pr_add(3),
115 ck_pr_btc(3), ck_pr_bts(3), ck_pr_btr(3)
116 Additional information available at http://concurrencykit.org/
118 April 11, 2013