Rethinking the futex API

Posted Jun 19, 2020 19:59 UTC (Fri) by itsmycpu (guest, #139639)
In reply to: Rethinking the futex API by sbaugh
Parent article: Rethinking the futex API

> As far as I'm aware, this can only be done by dedicating a thread to each futex you want to wait on - not exactly cheap.

Conceptually, a futex is not something you wait on. It is something that you use to wait. It is a consumer, not a producer. The wake call is the producer.

You can use a single futex to wait for many things at the same time (using user space utility functions to establish the necessary connections).