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Subject: Re: [Boost-build] question(s) about bjam code
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2017-10-06 02:31:37


On 10/05/2017 08:12 PM, Stefan Seefeld via Boost-build wrote:
> <snip>
> I'm looking at
>, and
> wonder why, despite the inline comment above the referenced line, this is not
> the first statement to be executed in the make1a function. I understand that the
> make1a function may be called multiple times from different locations, but
> should be ignored (i.e., should be a noop) in all but one case.
> However, each time the function is called, its parent's async counter is
> incremented (as long as this target 's progress is not yet RUNNING).


A depends on C
B depends on C

We enter make1a for C twice, once with each parent,
A and B. A and B both need to wait for C to complete,
hence we increment the async counter both times.

We only skip this if C has already completed, and
no waiting is required.

> Am I missing something ?

In Christ,
Steven Watanabe

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