darwin: make two uv__cf_*() functions static
darwin: task_info() cannot fail

And if it does: assert, don't return errno. It's a mach function, it
doesn't set errno.
unix: add mapping for ENETDOWN
unix: implicitly signal write errors to libuv user

Fix an infinite loop in the example below when the stream encounters
an EPIPE/ECONNRESET/etc. error:

    // keep writing until we start buffering
    while (stream->write_queue_size == 0) {
      uv_write_t* req = make_write_req();
      uv_buf_t buf = uv_buf_init("PING", 4);
      uv_write(req, stream, &buf, 1, write_cb);
    }

uv_write() does not return an error code on write errors, the error is
only reported to the callback.

Before this commit, uv_write() left stream->write_queue_size untouched
on error, meaning the caller had no way to find out about that error
until the next tick of the event loop - which in the example above
leads to an infinite loop because that next tick is indefinitely
postponed.

This commit works around that at the cost of some added internal
complexity.

Fixes joyent/node#5516.
unix: fix assert on signal pipe overflow

An incorrect assert() statement was causing libuv to crash when writing
to an internal signal pipe would result in EAGAIN/EWOULDBLOCK.

This commit doesn't solve the underlying issue that the signal pipe can
overflow.

This should fix joyent/node#5538
unix: fix stream refcounting buglet

Fix a buglet where uv_read_stop() would mark the handle as stopped even
when there are in-progress write requests.

This bug is unlikely to have affected anyone, the only case where it
has a user-visible effect is when:

  a) the handle has been stopped for reading but not writing, and
  b) it's the last active handle in the event loop's pollset

If both conditions are met, it's possible for the event loop to
terminate prematurely.
unix: turn off POLLOUT after stream connect

Clear the POLLOUT flag after we're done connecting. Not doing so isn't
really harmful but it may cause the event loop to wake up more often
than it has to.
Revert "unix: fix stream refcounting buglet"

This change is making 45 out of 527 node.js tests fail on OS X with the
following assertion:

    Assertion failed: (!uv__is_active(handle)), function
    uv__finish_close, file ../../deps/uv/src/unix/core.c, line 165.

It's likely a manifestation of a bug elsewhere but, because there's a
new node.js release going out tonight, I'm reverting it for now.

This reverts commit 80f2f826bf90b84e659321c0b7fd8af419acb85e.

Conflicts:
	src/unix/stream.c
2013.05.25, Version 0.10.8 (Stable)

Changes since version 0.10.7:

* windows: make uv_spawn not fail under job control (Bert Belder)

* darwin: assume CFRunLoopStop() isn't thread-safe (Fedor Indutny)

* win: fix UV_EALREADY incorrectly set (Bert Belder)

* darwin: make two uv__cf_*() functions static (Ben Noordhuis)

* darwin: task_info() cannot fail (Ben Noordhuis)

* unix: add mapping for ENETDOWN (Ben Noordhuis)

* unix: implicitly signal write errors to libuv user (Ben Noordhuis)

* unix: fix assert on signal pipe overflow (Bert Belder)

* unix: turn off POLLOUT after stream connect (Ben Noordhuis)
Now working on v0.10.9
unix: fix stream refcounting buglet

Fix a buglet where uv_read_stop() would mark the handle as stopped even
when there are in-progress write requests.

This bug is unlikely to have affected anyone, the only case where it
has a user-visible effect is when:

  a) the handle has been stopped for reading but not writing, and
  b) it's the last active handle in the event loop's pollset

If both conditions are met, it's possible for the event loop to
terminate prematurely.

This reapplies commit 80f2f82 which was temporarily reverted in fe7b154
because it was making a lot of node.js tests fail on OS X with the
following assertion:

    Assertion failed: (!uv__is_active(handle)), function
    uv__finish_close, file ../../deps/uv/src/unix/core.c, line 165.

Expecting that the handle is inactive when the state is UV_CLOSING
turns out to be a bad assumption: it's possible that the handle is
executing (for example) a shutdown request when uv__finish_close()
is called. That's okay, uv__stream_destroy() takes care of that.

The issue wasn't specific to OS X, it was just more visible on that
platform. (Slow) debug builds on Linux exhibited the same behavior.
unix: remove erroneous asserts

As of commit c53fe81, it's legal for write_queue_size > 0 when the
write_queue itself is empty. Sounds illogical but it means there are
error-state write requests in the write_completed_queue that will touch
up the write_queue_size on the next tick of the event loop.

Remove a few stray asserts that still checked for the old situation.
unix: appease warning about non-standard `inline`

Clang warns about using `inline`, which is not technically allowed in
C89 mode (libuv compiles with `-std=c89`). It's probably best to leave
it to the compiler to do the inlining anyway.
windows: call idle handles on every loop iteration

This mimicks what the unix implementation does: call idle handles on
every loop iteration. The guarantee that it runs on every loop iteration
makes it easier to predict and opens up more use cases.

Note that the name uv_idle is now a bit of a misnomer. There is
actually no guarantee that libuv completely processed all i/o
when an iteration ends. The windows implementation at least limits
the amount of callbacks processed in a single iteration to avoid some
handles getting a disproportionate amount of cpu attention.
test: reflect new idle semantics in test

Update the `idle_starvation` test to verify not only that idle callbacks
are called, but also that they are called once per loop iteration.
Merge remote-tracking branch 'origin/v0.10'

Conflicts:
	ChangeLog
	src/unix/stream.c
	src/version.c
unix, windows: run expired timers in run-once mode

Before this commit, creating an event loop, starting a timer and
calling uv_run(UV_RUN_ONCE) blocked in uv_run() until the timer
expired - but didn't actually run the timer.
2013.05.30, Version 0.11.4 (Unstable)

Changes since version 0.11.3:

* windows: make uv_spawn not fail when the libuv embedding application
  is run under external job control (Bert Belder)

* darwin: assume CFRunLoopStop() isn't thread-safe, fixing a race
  condition when stopping the 'stdin select hack' thread (Fedor Indutny)

* win: fix UV_EALREADY not being reported correctly to the libuv user in
  some cases (Bert Belder)

* darwin: make the uv__cf_loop_runner and uv__cf_loop_cb functions
  static (Ben Noordhuis)

* darwin: task_info() cannot fail (Ben Noordhuis)

* unix: add error mapping for ENETDOWN (Ben Noordhuis)

* unix: implicitly signal write errors to the libuv user (Ben Noordhuis)

* unix: fix assertion error on signal pipe overflow (Bert Belder)

* unix: turn off POLLOUT after stream connect (Ben Noordhuis)

* unix: fix stream refcounting buglet (Ben Noordhuis)

* unix: remove assert statements that are no longer correct (Ben
  Noordhuis)

* unix: appease warning about non-standard `inline` (Sean Silva)

* unix: add uv__is_closing() macro (Ben Noordhuis)

* unix: stop stream POLLOUT watcher on write error (Ben Noordhuis)

* include: document uv_update_time() and uv_now() (Ben Noordhuis)

* linux: fix cpu model parsing on newer arm kernels (Ben Noordhuis)

* linux: fix a memory leak in uv_cpu_info() error path (Ben Noordhuis)

* linux: don't ignore out-of-memory errors in uv_cpu_info() (Ben
  Noordhuis)

* unix, windows: move uv_now() to uv-common.c (Ben Noordhuis)

* test: fix a compilation problem in test-osx-select.c that was caused
  by the use of c-style comments (Bert Belder)

* darwin: use uv_fs_sendfile() use the sendfile api correctly (Wynn
  Wilkes)

* windows: call idle handles on every loop iteration, something the unix
  implementation already did (Bert Belder)

* test: update the idle-starvation test to verify that idle handles are
  called in every loop iteration (Bert Belder)

* unix, windows: ensure that uv_run() in RUN_ONCE mode calls timers that
  expire after blocking (Ben Noordhuis)
Now working on v0.11.5
doc: explain how to build a .so