lkml.org 
[lkml]   [2008]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
DateFri, 22 Feb 2008 08:46:16 -0500 (EST)
FromSteven Rostedt <>
SubjectRe: [PATCH [RT] 05/14] rearrange rt_spin_lock sleep

Gregory,

I guess we should have just read Documentation/memory-barriers.text

Here's the snippet:


Any atomic operation that modifies some state in memory and returns
information
about the state (old or new) implies an SMP-conditional general memory
barrier
(smp_mb()) on each side of the actual operation (with the exception of
explicit lock operations, described later). These include:

xchg();
cmpxchg();
atomic_cmpxchg();
atomic_inc_return();
atomic_dec_return();
atomic_add_return();
atomic_sub_return();
atomic_inc_and_test();
atomic_dec_and_test();
atomic_sub_and_test();
atomic_add_negative();
atomic_add_unless();
test_and_set_bit();
test_and_clear_bit();
test_and_change_bit();


-- Steve



\
 
 \ /
  Last update: 2008-02-22 14:49    [from the cache]
©2003-2010