Let's imagine we are in jshell, thus 1 session has been created already. 
Then
1. if we launch jBasic that calls .py there will be still 1 session (i.e. 
the same one)
2. if we launch python that calls .py the second session will be created

in both cases the same C extension with jbase_getdpEX inside is used

среда, 25 марта 2020 г., 19:28:17 UTC пользователь pfalson написал:

> Still not entirely sure why though. If python is the starting point and 
> you get a dp from jbase_getdpEX (you cant avoid at least one session) you 
> could pass the dp down the chain. 
>
> Sent from my iPhone
>
> On Mar 25, 2020, at 10:15 AM, Igor Osmolovskiy <[email protected] 
> <javascript:>> wrote:
>
> 
> Right. If a jBASE routine is the starting point - no new session is 
> created.
>
> But if python is the starting point then looks like we cannot avoid an 
> additional session
>
> среда, 25 марта 2020 г., 14:25:33 UTC пользователь pfalson написал:
>
>> Not following. If your starting point is jsh or LOGTO or a jBASE program 
>> you should be able to call a python routine and convert the dp to a pylong 
>> and pass it down for reuse.
>>
>> Sent from my iPhone
>>
>> On Mar 25, 2020, at 7:14 AM, Igor Osmolovskiy <[email protected]> wrote:
>>
>> 
>> Thanks Peter for your help
>>
>> Coming back to the initial question whether a DP could be initialized 
>> without a new session - looks like it is not possible. 
>> When we compile and catalog a JBC routine then a dll will be placed into 
>> bin. And when that JBC routine is called then it is actually called as a 
>> dll rather than executable (which can be removed even). So the same address 
>> space is used.
>> On the contrary when we call python then it is always a separate 
>> executable with its own address space..
>>
>> вторник, 10 марта 2020 г., 19:03:45 UTC пользователь pfalson написал:
>>
>>> https://github.com/pickmultivalue/jPython  
>>>
>>> On Tue, Mar 10, 2020 at 7:11 AM Igor Osmolovskiy <[email protected]> 
>>> wrote:
>>>
>>>> Would be interesting to have a look
>>>> Thanks!
>>>>
>>>> понедельник, 9 марта 2020 г., 19:31:07 UTC+1 пользователь pfalson 
>>>> написал:
>>>>>
>>>>> Your only choices are start from jsh/jbc call python, call jbc etc or 
>>>>> start with python call jbc. 
>>>>>
>>>>> Either way the dp needs to be carried around. 
>>>>>
>>>>> I can post an example of calling python (it needs jBASE 5).
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Mar 9, 2020, at 10:36 AM, Igor Osmolovskiy <[email protected]> 
>>>>> wrote:
>>>>>
>>>>> 
>>>>> Hello Dan
>>>>> Right, but is there a possibility to avoid creating a new thread? 
>>>>> One option proposed by Peter is to launch Pyhton from JBC e.g. But any 
>>>>> chance to achieve this for pure Pyhton?
>>>>>
>>>>> понедельник, 9 марта 2020 г., 15:27:22 UTC+1 пользователь DanE написал:
>>>>>>
>>>>>> That would be because the jsh initiated the thread and the program 
>>>>>> running under it is a shared object /dll beneath that thread.
>>>>>>
>>>>>>  
>>>>>>
>>>>>> Dan Ell​  | jBASE Technical Engineer
>>>>>> jBASE International, Inc.
>>>>>> *813-498-2544* |  866‑582‑8447
>>>>>> *[email protected]* |  www.jbase.com
>>>>>> 1050 Calle Amanecer, Suite A | San Clemente, CA 92673
>>>>>> *From:* [email protected] <[email protected]> *On Behalf 
>>>>>> Of *Igor Osmolovskiy
>>>>>> *Sent:* Monday, March 9, 2020 6:10 AM
>>>>>> *To:* jBASE <[email protected]>
>>>>>> *Subject:* Re: Getting the jBase DP (data pointer) of the current 
>>>>>> session when using pure C
>>>>>>
>>>>>>  
>>>>>>
>>>>>> Thank you Peter
>>>>>>
>>>>>>  
>>>>>>
>>>>>> But do you think it is still possible to retrieve a DP for an 
>>>>>> existing session? 
>>>>>>
>>>>>> It can be seen that no new session is created when a JBC program is 
>>>>>> being called in jshell e.g. Therefore a DP initialization is happening 
>>>>>> somehow for that case
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>>
>>>>>> суббота, 7 марта 2020 г., 1:13:48 UTC+1 пользователь pfalson написал:
>>>>>>
>>>>>> That creates a regular jBASE session dp. The null args are more for 
>>>>>> internal use. 
>>>>>>
>>>>>> Sent from my iPhone 
>>>>>>
>>>>>> > On Mar 6, 2020, at 2:56 PM, Igor Osmolovskiy <[email protected]> 
>>>>>> wrote: 
>>>>>> > 
>>>>>> > Peter, thanks for the code sample 
>>>>>> > 
>>>>>> > Could you please elaborate on what exactly the next line means 
>>>>>> > jbase_getdpEX(NULL,NULL,1,NULL) 
>>>>>> > 
>>>>>> > Thanks 
>>>>>> > Igor 
>>>>>> > 
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