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This removes all signal handling code from os_unix.c to os/signal.c. Now signal
handling is done like this:
- Watchers for signals are registered with libuv default event loop
- `event_poll` continuously calls `poll_uv_loop` to produce events until it
receives user input, SIGINT or a timeout
- Any signals received in `poll_uv_loop` will push events to a queue that is
drained and processed by `event_poll`
Signals aren't handled directly in the libuv callback to avoid recursion in the
event loop(which isn't supported by libuv).
The same principle will apply to other events in the future: Push to a queue
from a libuv callback and drain it from `event_poll`
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* Add const.
* Fix conditions (move && from end to start of line).
* Use int32_t instead of long.
* Use //-style comments.
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This enum doesn't need to be public since `event_poll` is only interested in
user input(but other events may be handled by libuv callbacks).
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The functions `mch_inchar`, `mch_breakcheck`, `mch_char_avail` were
reimplemented on top of libuv. Here's how it works:
- When Neovim needs to wait for characters, it will transfer control to libuv
event loop.
- When the libuv event loop gets user input, it will transfer control back to
Neovim
- Neovim uses the `input_read` function to get the actual data read by libuv.
With this scheme its possible to keep Neovim single-threaded while enjoying the
benefits provided by libuv.
This commit leaves SIGWINCH broken for now
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