EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: c++ 0x initialization of local (block scoped) static variables
From: "Jeff Hill" <[email protected]>
To: "'EPICS Core Talk'" <[email protected]>
Date: Thu, 11 Aug 2011 18:01:02 -0600
Interesting reading about concurrent initialization of local (block scoped)
static variables in the latest working draft of the c++ standard. 

See section 6.7. 

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf

"If control enters the declaration concurrently while the variable is being
initialized, the concurrent execution shall wait for completion of the
initialization. If control re-enters the declaration recursively while the
variable is being initialized, the behavior is undefined"

Note however that, after a quick read, I think I understand that no such
guarantees exist for dynamic initialization of file scoped static variables.

Jeff
______________________________________________________
Jeffrey O. Hill           Email        [email protected]
LANL MS H820              Voice        505 665 1831
Los Alamos NM 87545 USA   FAX          505 665 5107

Message content: TSPA

With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea. It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925





Navigate by Date:
Prev: Re: c++ static initialization Benjamin Franksen
Next: Re: [Merge] lp:~epics-core/epics-base/epicsR3.15-atomics into lp:epics-base Janet B. Anderson
Index: 2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: c++ static initialization Hill, Bruce
Next: [Merge] lp:~epics-core/epics-base/3.15-buildCompilerSpecific into lp:epics-base Jeff Hill
Index: 2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 02 Feb 2012 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·