Date: Thu, 09 Nov 2000 15:08:55 -0800 From: Jack Rusher <jar@integratus.com> To: James FitzGibbon <james@targetnet.com> Cc: hackers@freebsd.org Subject: Re: Repeatable STL core with -pthread Message-ID: <3A0B2E87.3B49887B@integratus.com> References: <20001109161045.D39548@targetnet.com>
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James FitzGibbon wrote:
>
> The program will core after about 10 seconds, every time.
> It would appear that there is an issue with some low-level allocator in the
> STL as shipped in 4.x.
Dude. The STL implementation that ships with g++ isn't thread safe.
In fact, if you read the STL portion of the C++ specification, you will
notice that threads are not mentioned at all. The only guarantees made
by the STL are that operations will complete within certain performance
guidelines.
As a safety tip, the string implementation in the g++ implementation
isn't thread safe either. It uses a shared buffer scheme ("char*
string->rep") to reduce memory consumption & improve performance. This
is in opposition to "deep copy" style libraries, like the SGI STL, that
work in threaded environments.
Because of the way the C++ standard is written, commercial STL
implementations, such as the Rogue Wave library that comes with the Sun
C++ compiler, suffer from the same threading problems.
--
Jack Rusher, Senior Engineer | mailto:jar@integratus.com
Integratus, Inc. | http://www.integratus.com
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