I'd like a way to wait on multiple condition variables. Windows has this... Or to treat condition variables as file descriptors so that select/poll/epoll can

I'd like a way to wait on multiple condition variables. Windows has this... Or to treat condition variables as file descriptors so that select/poll/epoll can be used to wait on them (you'd get a notification of a signal, though it might be spurious, so you still have to take the lock and check the condition before you consider the CV signaled).