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From: Peter Otten <__peter__@web.de>
Subject: Re: Thread-ID - how much could be?
Date: Thu, 11 Sep 2014 21:48:18 +0200
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Xref: csiph.com comp.lang.python:77777

Ervin Hegedüs wrote:

> I've made a long-time running daemon, which uses threads. Looks
> like that works perfectly, now I'm looking at the exceptions :).
> 
> In the log, I found an interesting message:
> 
> Exception in thread Thread-82:
> ...
> 
> The main function allows 2 thread to run simultaniously, and if
> the thread finished, then it joined with th.join(), where the
> "th" is the thread item, derived from threading.Thread class.
> 
> My question is: how much thread ID could be totally? Is there any
> maximum number? And if the thread reached that, what will be
> done? Overlflowed? Couting from 0 again?

A quick peak into threading.py reveals

# Helper to generate new thread names
_counter = 0
def _newname(template="Thread-%d"):
    global _counter
    _counter += 1
    return template % _counter

class Thread:
    ...
    def __init__(self, group=None, target=None, name=None,
                 args=(), kwargs=None, *, daemon=None):
        ...
        self._name = str(name or _newname())


There is no upper limit to the thread name other than that you will 
eventually run out of memory ;)