NAME

       ck_pr_fence_atomic — enforce partial ordering of atomic read-modify-write operations

LIBRARY

       Concurrency Kit (libck, -lck)

SYNOPSIS

       #include <ck_pr.h>

       void
       ck_pr_fence_atomic(void);

       void
       ck_pr_fence_strict_atomic(void);

DESCRIPTION

       The  ck_pr_fence_atomic()  function  enforces  the  ordering  of  any atomic read-modify-write operations
       relative to the invocation of the function. This function always serve as an implicit  compiler  barrier.
       On  architectures  implementing CK_MD_TSO, this operation only serves as a compiler barrier and no fences
       are emitted. On architectures implementing CK_MD_PSO and CK_MD_RMO, a store fence is  emitted.  To  force
       the unconditional emission of a fence, use ck_pr_fence_strict_atomic().

EXAMPLE

             #include <ck_pr.h>

             static int a = 0;
             static int b = 0;
             static int c = 0;

             void
             function(void)
             {

                     ck_pr_fas_int(&a, 1);

                     /*
                      * Guarantee that the update to a is completed
                      * with respect to the updates of b and c.
                      */
                     ck_pr_fence_atomic();
                     ck_pr_fas_int(&b, 2);
                     ck_pr_fas_int(&c, 2);

                     return;
             }

RETURN VALUES

       This function has no return value.

SEE ALSO

       ck_pr_stall(3),     ck_pr_fence_atomic_store(3),     ck_pr_fence_atomic_load(3),    ck_pr_fence_store(3),
       ck_pr_fence_load(3), ck_pr_fence_load_atomic(3), ck_pr_fence_load_store(3),  ck_pr_fence_load_depends(3),
       ck_pr_fence_memory(3),   ck_pr_barrier(3),  ck_pr_fas(3),  ck_pr_load(3),  ck_pr_store(3),  ck_pr_faa(3),
       ck_pr_inc(3),  ck_pr_dec(3),  ck_pr_neg(3),  ck_pr_not(3),  ck_pr_add(3),   ck_pr_sub(3),   ck_pr_and(3),
       ck_pr_or(3), ck_pr_xor(3), ck_pr_cas(3), ck_pr_btc(3), ck_pr_bts(3), ck_pr_btr(3)

       Additional information available at http://concurrencykit.org/

                                                  May 16, 2013                             CK_PR_FENCE_ATOMIC(3)