> The Linux people aren't dumb, so they give you eventfd - but there's no promise of single wakeup! NT wakes up one thread per increment, and the wakeup atomica

> The Linux people aren't dumb, so they give you eventfd - but there's no promise of single wakeup! NT wakes up one thread per increment, and the wakeup atomically decrements the semaphore; Linux wakes up every thread waiting on the semaphore, and they all fight over it, because there's no other option. You can get Linux to only wake up one thread using epoll and either EPOLLEXCLUSIVE or EPOLLONESHOT. Though I don't really understand why you'd want to wait on a semaphore and other waitables at the same time… probably this is just my Unix bias/lack of Windows experience showing.