[Pharo-dev] Multithreading

Yuriy Tymchuk yuriy.tymchuk at me.com
Thu Nov 21 06:33:31 EST 2013


On 20 Nov 2013, at 20:58, Clément Bera <bera.clement at gmail.com> wrote:

> So what you are looking for is Process and semaphores. 
> 
> This is not multithreading in the default Pharo VM + image, currently our semaphore/process management is not multithreaded, but executes all the process in the same thread.

Ouch. Do you know if this is planned for any milestone?

> What happens basically is that you will run several processes in 1 thread with different priorities, and processes with highest priorities will be executed first. This is very good for your case, because if you put your task in another process with lower priority than the UI process, each time you will trigger a UI interaction the secondary process will be temporarily stopped to execute your UI interaction.
> 
> (see #forkAt: Process userBackgroundPriority)
> 
> Seemingly there's no chapter about Process and semaphores yet but Stef is planning to write one.
> 
> The other alternatives are to use CogMT, a version of the Cog VM with real multithreading for FFI (but I think it will not work easily with your case) or the island VM plugin, which seemingly is an actor based multithreading system in Squeak/Pharo (however there is only 1 project that successfully uses it, which is the one of 3DICC).
> 
> 
> 
> 
> 2013/11/20 Yuriy Tymchuk <yuriy.tymchuk at me.com>
> I’m not proficient in multithreading, but I think that I’m looking for Semaphore and Process. Things that I implement take a very long time to run, and I can’t do anything else during that time or even cancel them. So I guess they should run in a separate process which I can achieve with #fork. But as I start to work with that I want to know all the rest that can be useful.
> 
> uko
> 
> On 20 Nov 2013, at 19:21, Clément Bera <bera.clement at gmail.com> wrote:
> 
>> Hello,
>> 
>> What do you mean by multithreading ?
>> Do you mean Semaphore and Process, Cog Multithreading, the Island VM plugin ?
>> 
>> 
>> 2013/11/20 Yuriy Tymchuk <yuriy.tymchuk at me.com>
>> Hi everyone, is there any chapter on multithreading in Pharo books? If not maybe I’ll write something about that, but any material will be useful for me right now.
>> 
> 
> 

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