1CK_PR_FENCE_ATOMIC_LO... BSD Library Functions Manual CK_PR_FENCE_ATOMIC_LO...
2

NAME

4     ck_pr_fence_atomic_load — enforce ordering of atomic read-modify-write
5     operations to load operations
6

LIBRARY

8     Concurrency Kit (libck, -lck)
9

SYNOPSIS

11     #include <ck_pr.h>
12
13     void
14     ck_pr_fence_atomic_load(void);
15
16     void
17     ck_pr_fence_strict_atomic_load(void);
18

DESCRIPTION

20     The ck_pr_fence_atomic_load() function enforces the ordering of any
21     atomic read-modify-write operations relative to any load operations fol‐
22     lowing the function invocation. This function always serve as an implicit
23     compiler barrier. On architectures implementing CK_MD_TSO, this operation
24     only serves as a compiler barrier and no fences are emitted. To force the
25     unconditional emission of a fence, use ck_pr_fence_strict_atomic_load().
26

EXAMPLE

28           #include <ck_pr.h>
29
30           static int a = 0;
31           static int b = 0;
32
33           void
34           function(void)
35           {
36                   int c;
37
38                   ck_pr_fas_int(&a, 1);
39
40                   /*
41                    * Guarantee that the update to a is completed
42                    * with respect to the load of *b.
43                    */
44                   ck_pr_fence_atomic_load();
45                   c = ck_pr_load_int(&b);
46
47                   return;
48           }
49

RETURN VALUES

51     This function has no return value.
52

SEE ALSO

54     ck_pr_stall(3), ck_pr_fence_atomic(3), ck_pr_fence_atomic_store(3),
55     ck_pr_fence_store(3), ck_pr_fence_load(3), ck_pr_fence_load_atomic(3),
56     ck_pr_fence_load_store(3), ck_pr_fence_load_depends(3),
57     ck_pr_fence_memory(3), ck_pr_barrier(3), ck_pr_fas(3), ck_pr_load(3),
58     ck_pr_store(3), ck_pr_faa(3), ck_pr_inc(3), ck_pr_dec(3), ck_pr_neg(3),
59     ck_pr_not(3), ck_pr_add(3), ck_pr_sub(3), ck_pr_and(3), ck_pr_or(3),
60     ck_pr_xor(3), ck_pr_cas(3), ck_pr_btc(3), ck_pr_bts(3), ck_pr_btr(3)
61
62     Additional information available at http://concurrencykit.org/
63
64                                 May 16, 2013
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