cygwin: implement uv_resident_set_memory (#4333)

According to the documentation for Cygwin, the penultimate field
of /proc/pid/stat corresponds to the RSS, so the method is basically

cygwin: implement uv_resident_set_memory (#4333)

According to the documentation for Cygwin, the penultimate field
of /proc/pid/stat corresponds to the RSS, so the method is basically
the same as in the Linux version. The only difference is that getpagesize()
will return wincap.allocation_granularity(), but in this mapping, RSS is
calculated using wincap.page_size(), which can be accessed by sysinfo.mem_unit.

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unix,win: add uv_get_available_memory() (#3754)

src: move uv_free_cpu_info to uv-common.c

PR-URL: https://github.com/libuv/libuv/pull/2433
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.co

src: move uv_free_cpu_info to uv-common.c

PR-URL: https://github.com/libuv/libuv/pull/2433
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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unix: add uv_get_constrained_memory() cygwin stub

PR-URL: https://github.com/libuv/libuv/pull/2361
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

unix: return 0 retrieving rss on cygwin

Refs: https://github.com/libuv/libuv/pull/1939
PR-URL: https://github.com/libuv/libuv/pull/1992
Reviewed-By: Santiago Gimeno <santiago.gimeno@

unix: return 0 retrieving rss on cygwin

Refs: https://github.com/libuv/libuv/pull/1939
PR-URL: https://github.com/libuv/libuv/pull/1992
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

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include,src: introduce UV__ERR() macro

Using -errno, -E**, and -pthread_function() can be
error prone, and breaks compatibility with some operating
systems that already negate errno'

include,src: introduce UV__ERR() macro

Using -errno, -E**, and -pthread_function() can be
error prone, and breaks compatibility with some operating
systems that already negate errno's (e.g. Haiku).

This commit adds a UV__ERR() macro that ensures libuv
errors are negative.

Fixes: https://github.com/libuv/help/issues/39
PR-URL: https://github.com/libuv/libuv/pull/1687
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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cygwin: implement support for cygwin and msys2

Cygwin and MSYS2 are POSIX layers implemented on top of Windows.
Use our POSIX `poll(2)` implementation of our poll abstraction.
For mo

cygwin: implement support for cygwin and msys2

Cygwin and MSYS2 are POSIX layers implemented on top of Windows.
Use our POSIX `poll(2)` implementation of our poll abstraction.
For most other components we already have dedicated sources
implementing them in terms of APIs available on Cygwin or
providing non-implementations of components not supported.

This leaves only three components that need Cygwin-specific
implementations:

* uv_uptime: implement using sysinfo
* uv_resident_set_memory: add a placeholder returning UV_ENOSYS
* uv_cpu_info: add a placeholder returning UV_ENOSYS

Update our test suite to account for features not available
due to Cygwin platform limitations or our placeholders.

PR-URL: https://github.com/libuv/libuv/pull/1312
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

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unix: remove src/unix/cygwin.c

The cygwin build has been broken for a long time now and no one is
complaining, which strongly suggests that no one actually uses it.
Remove it.

cygwin: remove unused variable

windows, unix: remove dead code

unix: fix include in cygwin.c

unix: use uv__hrtime() internally

This commit renames the various uv_hrtime() implementations to uv__hrtime().

Libuv uses the high-res timer internally in performance-critical code

unix: use uv__hrtime() internally

This commit renames the various uv_hrtime() implementations to uv__hrtime().

Libuv uses the high-res timer internally in performance-critical code paths.
Calling the non-public version avoids going through the PLT when libuv is
compiled as a shared object.

The exported uv_hrtime() now has a single definition in src/unix/core.c that
calls uv__hrtime().

A future optimization is to lift the uv__hrtime() declarations into header
files so they can be inlined at the call sites. Then again, linking with -flto
should accomplish the same thing.

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Merge branch 'v0.8'

unix: fix integer overflow in uv_hrtime

Conversion to nanoseconds was overflowing with 32-bit builds.

unix: move platform init out of loop.c

Move platform-specific initialization logic out of loop.c and into the
platform files (freebsd.c, sunos.c, etc).

unix, windows: remove handle init counters

Remove the handle init counters, no one uses them.

unix, test: make NANOSEC a 64 bits unsigned int

Avoids accidental overflow / truncation when it's used in 32 bits arithmetic.

unix: move handle specific close logic out of core.c

cygwin: we need to include uv-common.h for uv__set_sys_error()

Fix missing increments of loop->counters

cygwin: fix undefined _SC_PAGESIZE

unistd.h was not included, when tried to build node 0.5.9 had an error of:
_SC_PAGESIZE undefined

Add flags to uv_fs_event_init

Change return type of uv_get_*_memory() functions

... from double to uint64_t. Limit use of floating point in public API as much
as possible.

os: implement loadavg (not working on cygwin/win)

os: implement memory bindings

* us_get_free_memory
* us_get_total_memory