There is no Thread API to put a thread into a 'dying' state, so any such
possible observation of a thread is a non-deterministic race.

The C-API rb_thread_select and rb_thread_blocking_region functions have been deprecated
for a long time and finally removed in Ruby 2.2.0 (or trunk). The C-API specs for these
functions were not compiling properly on 2.2.0 and the specs for rb_thread_blocking_region
had serious race condition flaws. While Rubinius is not yet 2.2.0 compatible at this point
and the C-API will continue to have these functions until we tick to 2.2.0 compatibility,
there's no point wasting time fixing these specs.

This is the read-only version of :vm_inc_global_serial,
returning the current value of the serial without modification.

This is useful for implementing caches in Ruby-space that
are to be invalidated when the global serial is incremented.
(That is, when constants are assigned or included into modules).

Many log messages may be associated with a particular log level, but some
log output (eg the command line of the process) are not necessarily associated
with a log level as that is typically specified. In other words, some info
should always be written to the log. It's not a matter of program 'condition'
(eg warning, debug, error). The content *is* informational, but the 'info'
level typically indicates something between optional and important, inclusive,
and may be turned off.

Because of syslog limitations, the write() output is tagged LOG_INFO.

RubyGems 2.4.6 installed

=== 2.4.6 / 2014-02-05

Bug fixes:

* Fixed resolving gems with both upper and lower requirement boundaries.
  Issue #1141 by Jakub Jirutka.
* Moved extension directory after require_paths to fix missing constant bugs
  in some gems with C extensions.  Issue #784 by André Arko, pull request
  #1137 by Barry Allard.
* Use Gem::Dependency#requirement when adding a dependency to an existing
  dependency instance.  Pull request #1101 by Josh Cheek.
* Fixed warning of shadowed local variable in Gem::Specification.  Pull request
  #1109 by Rohit Arondekar
* Gem::Requirement should always sort requirements before coercion to Hash.
  Pull request #1139 by Eito Katagiri.
* The `gem open` command should change the current working directory before
  opening the editor.  Pull request #1142 by Alex Wood.
* Ensure quotes are stripped from the Windows launcher script used to install
  gems.  Pull request #1115 by Youngjun Song.
* Fixed errors when writing to NFS to to 0444 files.  Issue #1161 by Emmanuel
  Hadoux.
* Removed dead code in Gem::StreamUI.  Pull request #1117 by mediaslave24.
* Fixed typos.  Pull request #1096 by hakeda.
* Relaxed CMake dependency for RHEL 6 and CentOS 6.  Pull request #1124 by Vít
  Ondruch.
* Relaxed Psych dependency.  Pull request #1128 by Vít Ondruch.

=== 2.4.5 / 2014-12-03

Bug fixes:

* Improved speed of requiring gems.  (Around 25% for a 60 gem test).  Pull
  request #1060 by unak.
* RubyGems no longer attempts to look up gems remotely with the --local flag.
  Pull request #1084 by Jeremy Evans.
* Executable stubs use the correct gem version when RUBYGEMS_GEMDEPS is
  active.  Issue #1072 by Michael Kaiser-Nyman.
* Fixed handling of pinned gems in lockfiles with versions.  Issue #1078 by
  Ian Ker-Seymer.
* Fixed handling of git@example:gem.git URIs.  Issue #1054 by Mogutan Mogu.
* Fixed handling of platforms retrieved from the dependencies API.  Issue
  #1058 and patch suggestion by tux-mind.
* RubyGems now suggests a copy-pasteable `gem pristine` command when
  extensions are missing.  Pull request #1057 by Shannon Skipper.
* Improved errors for long file names when packaging.  Pull request #1016 by
  Piotrek Bator.
* `gem pristine` now skips gems cannot be found remotely.  Pull request #1064
  by Tuomas Kareinen.
* `gem pristine` now caches gems to the proper directory.  Pull request #1064
  by Tuomas Kareinen.
* `gem pristine` now skips bundled gems properly.  Pull request #1064 by
  Tuomas Kareinen.
* Improved interoperability of Vagrant with RubyGems.  Pull request #1057 by
  Vít Ondruch.
* Renamed CONTRIBUTING to CONTRIBUTING.rdoc to allow markup.  Pull request
  #1090 by Roberto Miranda.
* Switched from #partition to #reject as only one collection is used.  Pull
  request #1074 by Tuomas Kareinen.
* Fixed installation of gems on systems using memory-mapped files.  Pull
  request #1038 by Justin Li.
* Fixed bug in Gem::Text#min3 where `a == b < c`.  Pull request #1026 by
  fortissimo1997.
* Fixed uninitialized variable warning in BasicSpecification.  Pull request
  #1019 by Piotr Szotkowski.
* Removed unneeded exception handling for cyclic dependencies.  Pull request
  #1043 by Jens Wille.
* Fixed grouped expression warning.  Pull request #1081 by André Arko.
* Fixed handling of platforms when writing lockfiles.

------------------------------------------------------------------------------

Conflicts:
	gems_list.txt
	kernel/bootstrap/thread.rb
	spec/ruby/optional/capi/thread_spec.rb

A Thread can be in exactly three states via the methods that are available:
running, sleeping, and dead. Every other supposed state is a race condition
because there is no API to put the thread deterministically (ie, not as a
factor of some random scheduling artifact) into that state.