Re: [fiber] Moving fibers between threads

From: oliver.kowalke_at_[hidden]
Date: 2023-09-28 04:09:49

Yoi can't move a runnong fiber to anotjer thread. A fiber is simply a stack (+ some registers) that is assigned a thread for execution.

27.09.2023 22:12:57 Niall Douglas via Boost <boost_at_[hidden]>:

> Dear Boost,
> 
> At work I need to move a Boost Fiber from one kernel thread to another.
> There is a dedicated documentation page for this:
> 
> https://www.boost.org/doc/libs/1_83_0/libs/fiber/doc/html/fiber/migration.html
> 
> What that page doesn't say is how to migrate yourself if you're
> currently within a Fiber to another kernel thread, as the docs only talk
> about migrating Fibers currently not executing and in the ready not
> sleeping state. I guess this would work:
> 
> 1. Create a new Fiber, and go into a loop giving up the current execution.
> 
> 2. When that new Fiber executes, migrate the original fiber to its new
> kernel thread, then have it exit the loop so it proceeds. Then self
> immolate, as you're done.
> 
> 
> But now you're creating and destroying a whole Fiber just to migrate a
> Fiber between kernel threads, and that feels icky.
> 
> I don't suppose there's a better way e.g. some sort of way of asking the
> current thread's Fiber scheduler to call a function when it's next not
> executing a Fiber? That would avoid the needless Fiber creation and
> destruction per migration of a Fiber across kernel threads.
> 
> Thanks for help in advance.
> 
> Niall
> 
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