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Re: [google/gcc-4_7] fix race in __cxa_guard_acquire

From: Diego Novillo <dnovillo at google dot com>
To: Ollie Wild <aaw at google dot com>
Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>, Paul Pluzhnikov <ppluzhnikov at google dot com>
Date: Wed, 19 Sep 2012 16:01:39 -0400
Subject: Re: [google/gcc-4_7] fix race in __cxa_guard_acquire
References: <CAFOgFcQSac8B=apoCUEzFWvTsJm_iCcHgp60Fe0x88CfhDQO8Q@mail.gmail.com>

On 2012-09-19 15:59 , Ollie Wild wrote:

         * 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.

OK.

Diego.

References:
- [google/gcc-4_7] fix race in __cxa_guard_acquire
  - From: Ollie Wild

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