darwin: emit relative path in fsevents

unix: rethink relaxed accept() approach

Benchmarks demonstrated that the idle timer handle approach didn't balance the
load quite fair enough, the majority of new connections still ended

unix: rethink relaxed accept() approach

Benchmarks demonstrated that the idle timer handle approach didn't balance the
load quite fair enough, the majority of new connections still ended up in one
or two processes.

The new approach voluntarily gives up a scheduler timeslice by calling
nanosleep() with a one nanosecond timeout.

Why not sched_yield()? Because on Linux (and this is probably true for other
Unices as well), sched_yield() only yields if there are other processes running
on the same CPU.

nanosleep() on the other hand always forces the process to sleep, which gives
other processes a chance to accept our pending connections.

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test: fix aliasing warning in dns-server.c

bench: let client close connection in tcp_multi_accept{2,4,8}

bench: add idle delay to tcp_multi_accept{2,4,8}

bench: add tcp accept benchmarks

unix, windows: add uv_tcp_open and uv_udp_open

unix, windows: return error if uv_pipe_open fails

linux: improve /proc/cpuinfo parser

Make uv_cpu_info() understand the ARM and MIPS versions of /proc/cpuinfo,
it only knew how to deal with the x86 version

This commit also fixe

linux: improve /proc/cpuinfo parser

Make uv_cpu_info() understand the ARM and MIPS versions of /proc/cpuinfo,
it only knew how to deal with the x86 version

This commit also fixes a buglet where uv_cpu_info() reported the maximum CPU
frequency instead of the actual CPU frequency. That is, before this commit
`out/Debug/run-tests platform_output | grep speed | sort | uniq -c` on my
system always reported:

8 speed: 3400

Now it reports (for example):

2 speed: 3400
6 speed: 1600

In other words, two CPUs are running at full speed while the others have been
scaled back because they're mostly idle.

This is a back-port of commit 54bfb66 from the master branch.

Fixes #526.

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win/tty: reset background brightness when color is set to default

darwin: fix build when minimum OS X version is specified

The OS X version was being checked with the __MAC_OS_X_VERSION_MIN_REQUIRED__
macro, but this value doesn't match the actual SDK

darwin: fix build when minimum OS X version is specified

The OS X version was being checked with the __MAC_OS_X_VERSION_MIN_REQUIRED__
macro, but this value doesn't match the actual SDK version when it is
overridden with the -mmacosx-version-min command line switch.

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windows: un-break writable tty handles

windows: remove unnecessary pointer alignment code

windows: style

aix: add initial platform support for aix using gcc/gxlc

Adds initial libuv build/platform support for AIX. Builds work using gcc or the
IBM XL C compiler using its gxlc wrapper. Platfor

aix: add initial platform support for aix using gcc/gxlc

Adds initial libuv build/platform support for AIX. Builds work using gcc or the
IBM XL C compiler using its gxlc wrapper. Platform support is added for
uv_hrtime, uv_exepath, uv_get_free_memory, uv_get_total_memory, uv_loadavg,
uv_uptime, uv_cpu_info, uv_interface_addresses.

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windows: rename UV_HANDLE_CLOSING to UV__HANDLE_CLOSING

windows: support for NULL as uv_queue_work callback

This will make uv_queue_work consistent with other functions, where it's
possible to omit the callback. I'm pretty sure that this is a

windows: support for NULL as uv_queue_work callback

This will make uv_queue_work consistent with other functions, where it's
possible to omit the callback. I'm pretty sure that this is already
implemented for unix systems, although I didn't test the unix part of
uv_queue_work.

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Add uv_thread_self.

doc: add note about -D_GNU_SOURCE

unix: remove __read_mostly macro

It creates trouble with llvm-gcc on OS X.

darwin: use FSEvents to watch directory changes

unix: put child process stdio fds in blocking mode

Remove the O_NONBLOCK flag from file descriptors 0-2, most applications don't
expect EAGAIN errors when dealing with stdio.

unix: code cleanup, rename variable

unix: support missing api on NetBSD

unix: reimplement accept() EMFILE trick

Implement a best effort approach to mitigating accept() EMFILE errors.

We have a spare file descriptor stashed away that we close to get belo

unix: reimplement accept() EMFILE trick

Implement a best effort approach to mitigating accept() EMFILE errors.

We have a spare file descriptor stashed away that we close to get below
the EMFILE limit. Next, we accept all pending connections and close them
immediately to signal the clients that we're overloaded - and we are, but
we still keep on trucking.

There is one caveat: it's not reliable in a multi-threaded environment.
The file descriptor limit is per process. Our party trick fails if another
thread opens a file or creates a socket in the time window between us
calling close() and accept().

Fixes #315.

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