create threads from thread in hierarical fashion

General OpenMP discussion

create threads from thread in hierarical fashion

Postby open_coder » Sun Dec 30, 2018 10:00 pm

Hi
I want to create thread as follow
Initially single thread will run, as a whole, further this threads spitted into two threads say thread_0 and thread_1, now further threads_1 spitted in to multiple threads i.e, thread_2, thread_3 ...,
and further based on condition kill some threads while rest allow to run. as depicted in figure below.


|---------> thread_0------------------------------------------------------------------------------------->|
(process starts here) thread_0 ---->| |----------> thread_1----------| |
|----------> thread_1 --------->|----------> thread_2----------| (killed here) |
|----------> thread_3----------| | -------------> (process terminates here)
|----------> thread_4---------------------------------------------->|
|----------> thread_5---------------------------------------------->|


Is it possible to create threads and terminated above manner using openmp. 8-)
Attachments
Uu.jpg
figure represented flow of threads creation and cancellation
Uu.jpg (33.88 KiB) Viewed 172 times
open_coder
 
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Re: create threads from thread in hierarical fashion

Postby MarkB » Mon Jan 07, 2019 9:12 am

The short answer is no: you can create threads in a hierarchy of teams using nested parallel regions, but once a team of threads has been created you cannot kill off a subset of them before the end of that parallel region. What is your use case? There may be other ways of handling it using OpenMP.
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