The ongoing discussion of threadlets (or fibrils, or whatever they will be called next week) has considered the addition of a major new API to the kernel. This discussion has, however, studiously ignored an important question: what about the longstanding kevent patch which, at some level, solves the same problems? The motivation for the first fibril patch was to make it easier to provide comprehensive asynchronous I/O in the kernel - and that was one of the reasons for kevents as well. So it has been surprising that kevents have not figured into this conversation.
