From owner-freebsd-stable  Fri Nov 24 15:20:21 2000
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Date: Sat, 25 Nov 2000 00:20:57 +0100
From: Bjorn Tornqvist <bjorn.tornqvist@west.se>
Organization: West AB
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To: Sergey Osokin <osa@freebsd.org.ru>
Cc: freebsd-stable@freebsd.org
Subject: Re: stranges in threads implementation... possible bug?
References: <20001124220303.A1027@freebsd.org.ru>
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std::string is not threadsafe in the STL shipped with FreeBSD (gcc
2.95.2),
so, what probably happens is that the string destructor being invoked in
sp_call after the spawn interfers with the string allocations in the
thread.
Try the program without strings.
Solution? Upgrade to gcc-2.97 (/usr/ports/lang/gcc-devel) and then
compile
with
eg++ -pthread -D_THREAD_SAFE
A note about 2.97 however;
operator{==|!=|etc)(string, const char*)
doesn't work for empty const char* strings, like this:
works not:
string hello="hello";
if (hello != "")
	// operator!=() fails to catch this
else
	// and instead goes here.

works:
if (hello != string(""))
...

Hope this helps for you, and please let me know otherwise.

Greetings, 

Bjorn



Sergey Osokin wrote:
> 
> Hello!
> My friend find some stranges in FreeBSD threads implementation...
> Here is a "special" code:
[SNIP]
> void
> SS::run()
> {
>     string s;   // !!!
>     string s1;  // !!!
>     sleep(1);
> }
> 
> /*=====================================================================*/
> static void sp_call(SS *ss)
> {
>     string s;   // !!!
>     ss->spawn();
> }


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