From e36b37583bebd229102f46c4ed7d2f6fad8697d4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 23 Jul 2021 13:24:09 +0200 Subject: Adding upstream version 0.6.0. Signed-off-by: Daniel Baumann --- doc/ck_pr_fence_load | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 doc/ck_pr_fence_load (limited to 'doc/ck_pr_fence_load') diff --git a/doc/ck_pr_fence_load b/doc/ck_pr_fence_load new file mode 100644 index 0000000..b6e778d --- /dev/null +++ b/doc/ck_pr_fence_load @@ -0,0 +1,113 @@ +.\" +.\" Copyright 2013 Samy Al Bahra. +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" +.Dd April 7, 2013 +.Dt ck_pr_fence_load 3 +.Sh NAME +.Nm ck_pr_fence_load +.Nd enforce partial ordering of load operations +.Sh LIBRARY +Concurrency Kit (libck, \-lck) +.Sh SYNOPSIS +.In ck_pr.h +.Ft void +.Fn ck_pr_fence_load void +.Ft void +.Fn ck_pr_fence_strict_load void +.Sh DESCRIPTION +This function enforces the ordering of any memory load +and +.Fn 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 +.Fn ck_pr_fence_load +is also be made visible only after a call to +.Fn 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 respectively), 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 +.Fn ck_pr_fence_strict_load . +Architectures implementing CK_MD_RMO always emit a load fence. +.Sh EXAMPLE +.Bd -literal -offset indent + +#include + +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; +} +.Ed +.Sh RETURN VALUES +This function has no return value. +.Sh SEE ALSO +.Xr ck_pr_stall 3 , +.Xr ck_pr_fence_atomic 3 , +.Xr ck_pr_fence_atomic_store 3 , +.Xr ck_pr_fence_atomic_load 3 , +.Xr ck_pr_fence_load_atomic 3 , +.Xr ck_pr_fence_load_store 3 , +.Xr ck_pr_fence_load_depends 3 , +.Xr ck_pr_fence_store 3 , +.Xr ck_pr_fence_memory 3 , +.Xr ck_pr_barrier 3 , +.Xr ck_pr_fas 3 , +.Xr ck_pr_load 3 , +.Xr ck_pr_store 3 , +.Xr ck_pr_faa 3 , +.Xr ck_pr_inc 3 , +.Xr ck_pr_dec 3 , +.Xr ck_pr_neg 3 , +.Xr ck_pr_not 3 , +.Xr ck_pr_add 3 , +.Xr ck_pr_sub 3 , +.Xr ck_pr_and 3 , +.Xr ck_pr_or 3 , +.Xr ck_pr_xor 3 , +.Xr ck_pr_cas 3 , +.Xr ck_pr_btc 3 , +.Xr ck_pr_bts 3 , +.Xr ck_pr_btr 3 +.Pp +Additional information available at http://concurrencykit.org/ -- cgit v1.2.3