Re: [jamboost] bjam failure when two instances running?

From: David Abrahams (dave_at_[hidden])
Date: 2002-12-18 12:54:09

Beman Dawes <bdawes_at_[hidden]> writes:

> I just had an odd failure - the full boost regression tests were running, 
> and I tried to run some separate filesystem tests at the same time (in a 
> different Win 32 command window).
>
> Four of the boost regression test status/bin/xxx.test directories were 
> mistakenly created in the boost-root/libs/filesystem directory! 

That's very odd. Are you sure you don't mean that it was crating
directories in which to build the compiled part of the filesystem
library?

> Both runs showed unexpected errors.
>
> Afterwards, I reran the tests, being careful not to invoke both at the same 
> time, and they then ran correctly.
>
> Note that both bjam runs are done from batch files.
>
> So on the surface, it looks like there may be some interaction between two 
> bjam instances running in completely different processes.
>
> Is that a known issue?

I don't understand the symptoms you're seeing at all. On the other
hand, I wouldn't expect it to work _right_ unless you used
ALL_LOCATE_TARGET to move the build tree of one or both of the tests.
Remember, bjam needs to evaluate file dependency information to decide
what's out-of-date and needs to be rebuilt. If something (like
another test build) comes along and changes the parts of the
filesystem which participate in the dependency graph, you could
certainly see some unexpected results.

-- 
David Abrahams
dave_at_[hidden] * http://www.boost-consulting.com
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