04-07-2009
I disconnected and noticed two things. First, the sites I couldn't reach changed. I can't search Google anymore (though I can ping it -- main page vs. results page?), but I could reach at least one site previously off-limits to me. Second, I didn't have traceroute installed (and couldn't install it without reconnecting). So I'll disconnect again shortly and report back.
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LEARN ABOUT NETBSD
membar_exit
MEMBAR_OPS(3) BSD Library Functions Manual MEMBAR_OPS(3)
NAME
membar_ops, membar_enter, membar_exit, membar_producer, membar_consumer, membar_sync -- memory access barrier operations
SYNOPSIS
#include <sys/atomic.h>
void
membar_enter(void);
void
membar_exit(void);
void
membar_producer(void);
void
membar_consumer(void);
void
membar_sync(void);
DESCRIPTION
The membar_ops family of functions provide memory access barrier operations necessary for synchronization in multiprocessor execution envi-
ronments that have relaxed load and store order.
membar_enter()
Any store preceding membar_enter() will reach global visibility before all loads and stores following it.
membar_enter() is typically used in code that implements locking primitives to ensure that a lock protects its data.
membar_exit()
All loads and stores preceding membar_exit() will reach global visibility before any store that follows it.
membar_exit() is typically used in code that implements locking primitives to ensure that a lock protects its data.
membar_producer()
All stores preceding the memory barrier will reach global visibility before any stores after the memory barrier reach global visibility.
membar_consumer()
All loads preceding the memory barrier will complete before any loads after the memory barrier complete.
membar_sync()
All loads and stores preceding the memory barrier will complete and reach global visibility before any loads and stores after the memory
barrier complete and reach global visibility.
SEE ALSO
atomic_ops(3)
HISTORY
The membar_ops functions first appeared in NetBSD 5.0.
BSD
February 11, 2007 BSD