Cooperative multi-task / event loop with co_await about cppcoro HOT 1 OPEN

I have the same question. Looking for a way to have coroutinues run atop an event loop. Some events may be ui-event handlers, other events may be the signal to resume a suspended coroutine.

The closest concept I see in the current api is to have a blocking call use an single_consumer_event to suspend itself, and then the resuming event calls .set() to continue it. But how, from the event loop we start a task until it suspends, and then get control back to process the next message, I haven't figured out.

Basically, I'm asking how to get an event handler to invoke a()

... run a() -> b() -> c() ---
 ^                           |
 |                           |
  --------------------------

... and then getting c()'s suspend to return control back to what called a()

Here, maybe c() could co_await a single_consumer_event, but I don't see where control goes at that point.

from cppcoro.