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https://github.com/ruby/strscan/commit/9e3db14fa2

https://github.com/ruby/strscan/commit/b4ddc3a2a6

(https://github.com/ruby/strscan/pull/157)

This is same as https://github.com/ruby/stringio/pull/134

---------

https://github.com/ruby/strscan/commit/141f9cf9b6

Co-authored-by: Koichi Sasada <ko1@atdot.net>

* Added `Ractor::Port`
  * `Ractor::Port#receive` (support multi-threads)
  * `Rcator::Port#close`
  * `Ractor::Port#closed?`
* Added some methods
  * `Ractor#join`
  * `Ractor#value`
  * `Ractor#monitor`
  * `Ractor#unmonitor`
* Removed some methods
  * `Ractor#take`
  * `Ractor.yield`
* Change the spec
  * `Racotr.select`

You can wait for multiple sequences of messages with `Ractor::Port`.

```ruby
ports = 3.times.map{ Ractor::Port.new }
ports.map.with_index do |port, ri|
  Ractor.new port,ri do |port, ri|
    3.times{|i| port << "r#{ri}-#{i}"}
  end
end

p ports.each{|port| pp 3.times.map{port.receive}}

```

In this example, we use 3 ports, and 3 Ractors send messages to them respectively.
We can receive a series of messages from each port.

You can use `Ractor#value` to get the last value of a Ractor's block:

```ruby
result = Ractor.new do
  heavy_task()
end.value
```

You can wait for the termination of a Ractor with `Ractor#join` like this:

```ruby
Ractor.new do
  some_task()
end.join
```

`#value` and `#join` are similar to `Thread#value` and `Thread#join`.

To implement `#join`, `Ractor#monitor` (and `Ractor#unmonitor`) is introduced.

This commit changes `Ractor.select()` method.
It now only accepts ports or Ractors, and returns when a port receives a message or a Ractor terminates.

We removes `Ractor.yield` and `Ractor#take` because:
* `Ractor::Port` supports most of similar use cases in a simpler manner.
* Removing them significantly simplifies the code.

We also change the internal thread scheduler code (thread_pthread.c):
* During barrier synchronization, we keep the `ractor_sched` lock to avoid deadlocks.
  This lock is released by `rb_ractor_sched_barrier_end()`
  which is called at the end of operations that require the barrier.
* fix potential deadlock issues by checking interrupts just before setting UBF.

https://bugs.ruby-lang.org/issues/21262

(https://github.com/ruby/strscan/pull/153)

Fix https://github.com/ruby/strscan/pull/152

CRuby can walk off the end because there's always a null byte. In JRuby,
the byte array is often (usually?) the exact size of the string. So we
need to check if len++ walked off the end.

This code was ported from a version by @byroot in
https://github.com/ruby/strscan/pull/127 but I missed adding this check
due to a lack of tests. A test is included for both "-" and "+" parsing.

https://github.com/ruby/strscan/commit/1abe4ca556

(https://github.com/ruby/strscan/pull/150)

These parse methods take begin and end indices, not begin and length. A
test is included.

Fixes https://github.com/jruby/jruby/issues/8823

https://github.com/ruby/strscan/commit/9690e39e73

MatchData#named_captures
(https://github.com/ruby/strscan/pull/146)

Fix https://github.com/ruby/strscan/pull/145

`MatchData#named_captures` use the last matched value for each name.

Reported by Linus Sellberg. Thanks!!!

https://github.com/ruby/strscan/commit/a6086ea322

(https://github.com/ruby/strscan/pull/144)

Changes:
- enabled tests passing on TruffleRuby
- removed `truffleruby` and keep only `truffleruby-head` in CI

https://github.com/ruby/strscan/commit/4aadfc8408

unknown capture group
(https://github.com/ruby/strscan/pull/143)

Fix https://github.com/ruby/strscan/pull/139

Reported by Benoit Daloze. Thanks!!!

https://github.com/ruby/strscan/commit/bc8a0d2623

don't clear named capture groups
(https://github.com/ruby/strscan/pull/142)

Fix https://github.com/ruby/strscan/pull/135

https://github.com/ruby/strscan/commit/b957443e20