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__INSN_BARRIER(3) 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 necessary 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. NetBSD 7.1.2 January 2, 2011 NetBSD 7.1.2