These would be consistent with having a background thread pool where the 
ttl expired that were running your repl commands. I was able to repro in 
lein after waiting a bit.

The default clojure.main/repl doesn't do anything like that, but maybe lein 
and boot do (perhaps via nrepl or something?)


On Tuesday, February 9, 2016 at 12:55:13 PM UTC-6, Magomimmo wrote:
>
> yep..now I get the same weird result with boot too:
>
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 34
> boot.user=> (.getId (Thread/currentThread))
> 64
> boot.user=> (.getId (Thread/currentThread))
> 64
>
> mimmo
>
> On 09 Feb 2016, at 19:48, Nathan Marz <nat...@nathanmarz.com> wrote:
>
> I should clarify that the thread id doesn't change instantly, it seems to 
> change when I've left it idle for a bit. Also on lein 2.5.2.
>
> On Tue, Feb 9, 2016 at 1:45 PM, Mimmo Cosenza <mimmo.cose...@gmail.com> 
> wrote:
>
>> I just tried with boot real:
>>
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>> boot.user=> (.getId (Thread/currentThread))
>> 34
>>
>>
>> mimmo
>>
>> On 09 Feb 2016, at 19:38, Alex Miller <a...@puredanger.com> wrote:
>>
>> That seems pretty weird. I can't reproduce it. I'm using lein 2.5.2. 
>>
>> On Tuesday, February 9, 2016 at 12:19:09 PM UTC-6, Nathan Marz wrote:
>>>
>>> I was doing some work that involved the use of thread locals, and I 
>>> noticed that within a REPL session (launched via 'lein repl') my thread 
>>> locals would reset themselves to their initial value. I did some digging 
>>> and found that the thread id keeps changing within a single REPL session, 
>>> e.g.:
>>>
>>> user=> (.getId (Thread/currentThread))
>>> 65
>>> user=> (.getId (Thread/currentThread))
>>> 74
>>> user=> (.getId (Thread/currentThread))
>>> 78
>>> user=> (.getId (Thread/currentThread))
>>> 78
>>> user=> (.getId (Thread/currentThread))
>>> 78
>>> user=> (.getId (Thread/currentThread))
>>> 82
>>>
>>> I'm hoping someone who knows the internals of the REPL could shed some 
>>> light onto why this is the behavior and why it was designed this way.
>>>
>>> Thanks,
>>> Nathan
>>>
>>>
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