r191495 - in /branches/google/gcc-4_7/libstdc++...

[aaw@gcc.gnu.org]

Author: aaw
Date: Wed Sep 19 20:04:36 2012
New Revision: 191495

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191495
Log:
Merge r191125 and r191191 from gcc-4_7-branch.

Google ref b/7173106.

	* libsupc++/guard.cc (__cxa_guard_acquire): Exit the loop earlier if
	we detect that another thread has had success. Don't compare_exchange
	from a finished state back to a waiting state.  Fix up the last
	argument of the first __atomic_compare_exchange_n.  Comment.

Modified:
    branches/google/gcc-4_7/libstdc++-v3/ChangeLog.google-4_7
    branches/google/gcc-4_7/libstdc++-v3/libsupc++/guard.cc