win, tty: improve SIGWINCH performance

Continuing improvement of SIGWINCH from PR #2308.

Running SetWinEventHook without filtering for the specific PIDs has
significant impact o

win, tty: improve SIGWINCH performance

Continuing improvement of SIGWINCH from PR #2308.

Running SetWinEventHook without filtering for the specific PIDs has
significant impact on the performance of the entire system. This PR
changes the way SIGWINCH is handled.

The SetWinEventHook callback now signals a separate thread,
uv__tty_console_resize_watcher_thread. This thread calls
uv__tty_console_signal_resize() which checks if the console was actually
resized. The uv__tty_console_resize_watcher_thread makes sure to not to
call the uv__tty_console_signal_resize function more than 30 times per
second.

The SetWinEventHook will not be installed, if the PID of the
conhost.exe process that owns the console window cannot be
determinated. This can happen when a 32bit libuv app is running on a
64bit Windows.

For such cases PR #1408 is partially reverted - when tty reads
WINDOW_BUFFER_SIZE_EVENT, it will also trigger a call to
uv__tty_console_signal_resize(). This will also help when the app is
running under console emulators. Documentation was also updated to
reflect that.

Refs: https://github.com/microsoft/terminal/issues/1811
Refs: https://github.com/microsoft/terminal/issues/410
Refs: https://github.com/libuv/libuv/pull/2308

PR-URL: https://github.com/libuv/libuv/pull/2381
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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doc: describe unix signal handling better

- SIGTERM seems OK to handle - I tested that on Linux, read POSIX, etc.
I can't see why it should be different from SIGUSR1, for example,

doc: describe unix signal handling better

- SIGTERM seems OK to handle - I tested that on Linux, read POSIX, etc.
I can't see why it should be different from SIGUSR1, for example,
except that the default handler is different.
- Also raise(15) is caught by the handler for me, and I can't see
why it wouldn't.

The main source of knowledge for this is POSIX.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04_03_03

PR-URL: https://github.com/libuv/libuv/pull/1987
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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doc: clarify that some remarks apply to windows

PR-URL: https://github.com/libuv/libuv/pull/1988
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.

doc: clarify that some remarks apply to windows

PR-URL: https://github.com/libuv/libuv/pull/1988
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

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doc: remove note about SIGWINCH on Windows

SIGWINCH support was improved by
https://github.com/libuv/libuv/commit/6ad1e81547c83f9fe7c5a806b6b282642e8d3bca

PR-URL: https://github

doc: remove note about SIGWINCH on Windows

SIGWINCH support was improved by
https://github.com/libuv/libuv/commit/6ad1e81547c83f9fe7c5a806b6b282642e8d3bca

PR-URL: https://github.com/libuv/libuv/pull/1638
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

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signal: add uv_signal_start_oneshot method

It behaves as `uv_signal_start` but it resets the signal handler as soon
as the signal is received.

Fixes: https://github.com/libuv/li

signal: add uv_signal_start_oneshot method

It behaves as `uv_signal_start` but it resets the signal handler as soon
as the signal is received.

Fixes: https://github.com/libuv/libuv/issues/1104
PR-URL: https://github.com/libuv/libuv/pull/1106
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>

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doc: add missing variable name

PR-URL: https://github.com/libuv/libuv/pull/432
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

doc: add API documentation