Issue #14963 has been reported by ngoto (Naohisa Goto).

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Bug #14963: Since r64107, on Solaris, spec test of rb_io_wait_readable hangs up
https://bugs.ruby-lang.org/issues/14963

* Author: ngoto (Naohisa Goto)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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Since r64107 (removal of timer thread), on Solaris (both on Solaris 10 and Solaris 11, both on x86 and sparc),
`make test-rubyspec` never ends in the test of rb_io_wait_readable in spec/ruby/optional/capi/io_spec.rb.

~~~
C-API IO function rb_io_wait_writable
- returns false if there is no error condition (FAILED - 1)
- raises an IOError if the IO is closed

C-API IO function rb_thread_fd_writable
- waits til an fd is ready for writing

C-API IO function rb_io_wait_readable
- returns false if there is no error condition
~~~

On rubyci.org, it stopped by 600s timeout.
(confirmed with r64171 or r64169)

Solaris10 i386: https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable10x/ruby-trunk/log/20180803T121806Z.fail.html.gz
Solaris11 i386: https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable11x/ruby-trunk/log/20180803T122406Z.fail.html.gz
Solaris10 sparc: https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable10s/ruby-trunk/log/20180803T071912Z.fail.html.gz
Solaris11 sparc: https://rubyci.org/logs/rubyci.s3.amazonaws.com/unstable11s/ruby-trunk/log/20180803T112505Z.fail.html.gz

I cannot determine whether the changes of removing timer thread contain some bug on Solaris or the test code is essentially wrong.




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