[ruby-dev:50675] [Ruby trunk Bug#595] Fiber ignores ensure clause

[samuel@oriontransfer•net]

Issue #595 has been updated by ioquatix (Samuel Williams).


In a GC language, it's impossible to ensure this, unless you want the GC to invoke some functionality.

I suggest adding something like `Fiber#stop` which causes internally `Fiber#resume` to raise exception.

It should be up to user code to deal with this IMHO, e.g.

```
fib = Fiber.new{
  begin
    Fiber.yield :ok
  ensure
    puts "should be print out"
  end
}
begin
  p fib.resume
ensure
  fib.stop
end
```

I believe there is no logical solution to avoid this issue except making it explicit of consumer of fiber. It's the same reason why we should do the following:


```
f = File.open
begin
  f.write "..."
ensure
  f.close
end
```


----------------------------------------
Bug #595: Fiber ignores ensure clause
https://bugs.ruby-lang.org/issues/595#change-75026

* Author: ko1 (Koichi Sasada)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Target version: 
* ruby -v: -
* Backport: 
----------------------------------------

 Ruby プロセス終了時，Fiber が ensure を無視します．
 これは，前から直そうと思って手がついていなかった問題です．
 10月末までには直そうと思います．結構複雑なので，後回しにしていましました．

``` 
 fib = Fiber.new{
   begin
     Fiber.yield :ok
   ensure
     puts "should be print out"
   end
 }
 p fib.resume
```


---Files--------------------------------
ensure_fiber.patch (2.12 KB)
ensure_fiber2.patch (7.57 KB)


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