TODO: ev_loop_wakeup

TODO: EV_STANDALONE == NO_HASSLE (do not use clock_gettime in ev_standalone)

TODO: faq, process a thing in each iteration

TODO: dbeugging tips, ev_verify, ev_init twice

TODO: ev_break for immediate exit (EVBREAK_NOW?)

TODO: ev_feed_child_event

TODO: document the special problem of signals around fork.

TODO: store pid for each signal

TODO: document file descriptor usage per loop

TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork

TODO: embed watchers need updating when fd changes

TODO: document portability requirements for atomic pointer access

TODO: document requirements for function pointers and calling conventions.