__INSN_BARRIER(3) BSD Library Functions Manual __INSN_BARRIER(3)NAME
__insn_barrier -- compiler reorder barrier
SYNOPSIS
#include <sys/cdefs.h>
void
__insn_barrier();
DESCRIPTION
The __insn_barrier() macro prevents GCC from moving code across the barrier. In other words, the compiler is not allowed to reorder read and
write commands below the barrier with the code preceding the barrier. Like with the volatile type qualifier, __insn_barrier() may be neces-
sary in some corner cases to prevent the compiler from misoptimizing.
SEE ALSO gcc(1), cdefs(3), mb(9)
Paul E. McKenney, Memory Barriers: a Hardware View for Software Hackers,
http://www.rdrop.com/users/paulmck/scalability/paper/whymb.2010.06.07c.pdf, June 7, 2010.
HISTORY
The __insn_barrier() macro first appeared in NetBSD 2.0.
BSD January 2, 2011 BSD
Check Out this Related Man Page
CDEFS(3) BSD Library Functions Manual CDEFS(3)NAME
cdefs -- common definitions and macros
SYNOPSIS
#include <sys/cdefs.h>
DESCRIPTION
The <sys/cdefs.h> header includes some common definitions and macros typical to the C language conventions of NetBSD. Among these are:
o Certain C language properties and definitions that are versioned according to the support in compilers. Examples include the
__func__ keyword and the restrict type qualifier from C99.
o Macros and definitions specific to compilers, preprocessors, and linkers; see __CONCAT(3), __UNCONST(3), __insn_barrier(3), and
attribute(3).
o Utility macros provided for convenience; see __arraycount(3) and bits(3).
The header also contains the __RCSID() and __KERNEL_RCSID() macros used for version control system (VCS) identifiers. Thus, all NetBSD
source code files typically include <sys/cdefs.h>, included as the first thing right after any possible copyright texts;
/*-
* Copyright (c) 1984 John Doe
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: cdefs.3,v 1.3 2011/04/08 07:55:04 jruoho Exp $");
It is possible to identify the RCS keyword strings by using ident(1).
SEE ALSO ident(1), param(3), stddef(3), types(3), c(7)HISTORY
The <sys/cdefs.h> header was originally imported from 386BSD.
BSD April 8, 2011 BSD
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