[ruby-core:102910] [Ruby master Bug#16608] ConditionVariable#wait should return false when timeout exceeded

Issue #16608 has been updated by jeremyevans0 (Jeremy Evans).


@matz agreed to change the return value of Mutex#sleep at the last developer meeting.  However, that breaks a Mutex_m test: https://github.com/ruby/ruby/pull/4256/checks?check_run_id=2135513377#step:15:1295

So the Mutex_m test needs to be fixed first, a new release needs to be made, and the bundled gems need to be updated, before the Mutex#sleep change can be merged.

----------------------------------------
Bug #16608: ConditionVariable#wait should return false when timeout exceeded
https://bugs.ruby-lang.org/issues/16608#change-90974

* Author: shugo (Shugo Maeda)
* Status: Assigned
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
The following program prints `false` on Ruby 1.8, but `true` on Ruby 1.9 or later.

```
require "monitor"
m = Monitor.new
c = m.new_cond
m.synchronize { p c.wait(0.1) }
```

However, it's not critical because most programs check the condition after wait.



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