core.thread vs std.concurrency - which of them to use?

Petar Petar
Thu Aug 6 23:14:38 UTC 2020

On Thursday, 6 August 2020 at 01:13:28 UTC, Victor L Porton wrote:
> When to use core.thread and when std.concurrency for 
> multithreading in applications? Is one of them a preferred way?

Druntime's core.thread sets the foundation for D's 
multi-threading (or at least the non-betterC foundation). On top 
of it Phobos' std.concurrency and std.parallelism provide a 
higher-level abstractions.

Which ones you should use depends on your application:

* If you want to build a web application, event loop is the way 
to go -> look at libraries like vibe-d / vibe-core / event-code 
(these I've ordered from high-level to lowe-level).

* If you want to speed up a computation, then you're likely 
looking for data-parallelism -> look into std.parallelism and 
only if you need more control you can consider core.thread

* If you need concurrency, either logical (represent different 
"processes" like web requests, AI agents in a simulation, or say 
simply remembering different states of a graph iteration) or 
physical (using multiple cores to do things concurrently, but not 
necessarily based on data-parallelism) look into std.concurrency.

* If want to build a library (e.g. event loop, task 
system/future/promises/ reactive extensions, actor model, SCP, 
etc.) then you need to understand how things work under the hood 
and so I'd say that reading core.thread's source code would be 


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