[ruby-dev:49118] [Ruby trunk - Bug #11277] "code converter not found" error with multi-thread (high occurrence rate since r50887)

Issue #11277 has been updated by Naohisa Goto.

Subject changed from "code converter not found" Failure (high occurrence rate since r50887) to "code converter not found" error with multi-thread (high occurrence rate since r50887)

たとえば #5654 のような何らかのロック機構が必要な気はしますが、
Encoding 関係は、事前にどのファイルにどのクラス・モジュールが格納されているかは完全に把握済、かつ、circular requireは絶対無い、という前提があるため、グローバルなロックまでは必要無く、クラス・モジュールオブジェクト単位の簡易なロックで十分かもしれません。

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Bug #11277: "code converter not found" error with multi-thread (high occurrence rate since r50887)
https://bugs.ruby-lang.org/issues/11277#change-53040

* Author: Naohisa Goto
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0dev (2015-06-16) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
sparc Solaris 10 にて、r50887 以降、make test-all にて以下の3つのFailureが出るようになりました。

~~~
  1) Failure:
TestDir_M17N#test_filename_extutf8_inteucjp_unrepresentable [/XXXXX-trunk-50887/test/ruby/test_dir_m17n.rb:152]:
assert_separately failed with error message.
<""> expected but was
<"/XXXXX-trunk-50887/test/lib/envutil.rb:72:in `read': code converter not found (UTF-8 to EUC-JP) (Encoding::ConverterNotFoundError)\n\tfrom /XXXXX-trunk-50887/test/lib/envutil.rb:72:in `block in invoke_ruby'\n">.

  2) Failure:
TestDir_M17N#test_filename_extutf8_inteucjp_representable [/XXXXX-trunk-50887/test/ruby/test_dir_m17n.rb:125]:
assert_separately failed with error message.
<""> expected but was
<"/XXXXX-trunk-50887/test/lib/envutil.rb:72:in `read': code converter not found (UTF-8 to EUC-JP) (Encoding::ConverterNotFoundError)\n\tfrom /XXXXX-trunk-50887/test/lib/envutil.rb:72:in `block in invoke_ruby'\n">.

  3) Failure:
TestDir_M17N#test_filename_ext_euc_jp_and_int_utf_8 [/XXXXX-trunk-50887/test/ruby/test_dir_m17n.rb:246]:
assert_separately failed with error message.
<""> expected but was
<"/XXXXX-trunk-50887/test/lib/envutil.rb:72:in `read': code converter not found (EUC-JP to UTF-8) (Encoding::ConverterNotFoundError)\n\tfrom /XXXXX-trunk-50887/test/lib/envutil.rb:72:in `block in invoke_ruby'\n">.
~~~





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