Re: Thread-safe singleton w/ Boost.Threads

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2001-09-25 10:43:16

> This has an even subtler bug. (IMO - I'm not an expert at threading!) No
> mutex protects pm, so according to POSIX memory visibility rules a thread
> can pass through call_once, see that another thread has already executed
> m_once, and fetch the old value of pm, i.e. zero.
>
> Comments? Is the flaw in Boost.Threads or in my limited understanding?

http://groups.google.com/groups?as_umsgid=3AC07BBB.4F52286E%40web.de
http://groups.google.com/groups?as_umsgid=3AC0A93D.4222518B%40web.de
http://sources.redhat.com/ml/libc-alpha/2001-04/msg00271.html
http://sources.redhat.com/ml/libc-alpha/2001-05/msg00019.html

regards,
alexander.