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Re: For which gcc release is going to be foreseen the support for the Coroutines TS extension?


On 7/26/19 6:03 AM, Iain Sandoe wrote:
Hello Sebastian,

On 26 Jul 2019, at 10:19, Florian Weimer <fweimer@redhat.com> wrote:

C++ coroutines are stackless.  I don't think any new low-level run-time
support will be needed.

correct, C++20 coroutines and threading mechanisms are orthogonal
facilities; one can use (IS C++20) coroutines on top of a threaded system
or in a single-threaded environment.

Two places I see them as being a go-to facility in embedded systems are:
  * co-operative multi-tasking UIs on single-threaded platforms.
  * async I/O completion by continuations, rather than callbacks.

There are cases where the overhead of threads is too expensive. For instance hiding (cache-missing) load latencies by doing other work while waiting -- a context switch at that point is far too expensive.

nathan

--
Nathan Sidwell


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