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NAME ck_pr_fence_load -- enforce partial ordering of load operations LIBRARY Concurrency Kit (libck, -lck) SYNOPSIS #include <ck_pr.h> void ck_pr_fence_load(void); void ck_pr_fence_strict_load(void); DESCRIPTION This function enforces the ordering of any memory load and ck_pr_load(3) operations relative to the invocation of the function. Any store operations that were committed on remote processors and received by the calling processor before the invocation of ck_pr_fence_load() is also be made visi- ble only after a call to ck_pr_fence_load(). This function always serves as an implicit compiler barrier. On architectures with CK_MD_TSO or CK_MD_PSO specified (total store ordering and partial store ordering re- spectively), this operation only serves as a compiler barrier and no fence instructions will be emitted. To force the unconditional emission of a load fence, use ck_pr_fence_strict_load(). Architectures implementing CK_MD_RMO always emit a load fence. EXAMPLE #include <ck_pr.h> static unsigned int a; static unsigned int b; void function(void) { unsigned int snapshot_a, snapshot_b; snapshot_a = ck_pr_load_uint(&a); /* * Guarantee that the load from "a" completes * before the load from "b". */ ck_pr_fence_load(); snapshot_b = ck_pr_load_uint(&b); return; } RETURN VALUES This function has no return value. SEE ALSO ck_pr_stall(3), ck_pr_fence_atomic(3), ck_pr_fence_atomic_store(3), ck_pr_fence_atomic_load(3), ck_pr_fence_load_atomic(3), ck_pr_fence_load_store(3), ck_pr_fence_load_depends(3), ck_pr_fence_store(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/ April 7, 2013 ck_pr_fence_load(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | EXAMPLE | RETURN VALUES | SEE ALSO
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