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From: Daniel Colascione <dancol@dancol.org>
Newsgroups: gnu.bash.bug
Subject: Re: Request For Enhancement - TID variable
Date: Thu, 26 Dec 2019 08:48:33 -0800
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On 12/26/19 7:37 AM, Eric S. Raymond wrote:
> In attempting to use GNU parallel, with some bash scripts, I
> discovered I had a problem with tempfile collisions due to
> all of the thread having the same PID.
> 
> I was able to come up with a workaround, but...
> 
> RFE: bash should have a TID varuable that returns the vakue of gettid(2).
> 
> If the bash devs are too busy for this like the idea, I could write
> the patch.

Are you sure that'd help? Parallel runs bash in a bunch of subprocesses, 
so looking at PID would suffice to distinguish jobs. Are you sure you 
weren't seeing an invariant PID because you were letting the PID 
variable expansion happen too early?