Overview

Miso.Concurrent provides Waiter, a lightweight synchronization primitive built on MVar that the miso runtime uses to coordinate its event loop with subscription threads.

Two constructors are available with different wakeup semantics:

• waiter — many-to-one. Multiple threads may call notify concurrently; only one pending notification is retained at a time (tryPutMVar is used, so rapid notifications coalesce). The single consumer calls wait to block until at least one notification arrives.
• oneshot — one-to-many. One thread calls notify to permanently unblock all threads currently (or subsequently) calling wait. Implemented with readMVar, so the stored value is never consumed.

See also

• Miso.Effect — Sub subscriptions that use notify to wake the event loop
• Miso.Runtime — the event loop that calls wait