[ruby-core:23649] [Bug #1547] Fiber#alive? Returns 0 for true on 1.9.1

Bug #1547: Fiber#alive? Returns 0 for true on 1.9.1
http://redmine.ruby-lang.org/issues/show/1547

Author: Run Paint Run Run
Status: Open, Priority: Normal
ruby -v: ruby 1.9.1p154 (2009-05-22 revision 23541) [i686-linux]

When a Fiber is alive, Fiber#alive? returns 0 on 1.9.1; true on 1.9.2. The latter behaviour is consistent with the documentation.

  $ ruby91 -rfiber -ve 'f=Fiber.new {1}; p f.alive?; f.resume; p f.alive?'
  ruby 1.9.1p154 (2009-05-22 revision 23541) [i686-linux]
  0
  false

  $ rubybleed -rfiber -ve 'f=Fiber.new {1}; p f.alive?; f.resume; p f.alive?'
  ruby 1.9.2dev (2009-05-28 trunk 23601) [i686-linux]
  true
  false

branches/ruby_1_9_1/cont.c:

  rb_fiber_alive_p(VALUE fibval)
  {
    rb_fiber_t *fib;
    GetFiberPtr(fibval, fib);
    return fib->status != TERMINATED;
  }

trunk/cont.c:

  rb_fiber_alive_p(VALUE fibval)
  {
    rb_fiber_t *fib;
    GetFiberPtr(fibval, fib);
    return fib->status != TERMINATED ? Qtrue : Qfalse;
  }


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