[ruby-core:34141] [Backport87-Backport#4236][Open] zlib.c requires RB_GC_GUARD backport from 1.9

[Aman Gupta <redmine@ruby-lang.org>]

Backport #4236: zlib.c requires RB_GC_GUARD backport from 1.9
http://redmine.ruby-lang.org/issues/show/4236

Author: Aman Gupta
Status: Open, Priority: Normal
Category: ext

This issue was fixed in 1.9 r28080 via this patch: http://redmine.ruby-lang.org/repositories/diff/ruby-19?rev=28080

But the issue also exists in 1.8 branch, so the same patch should be backported. To replicate:

<pre><code class="ruby">
unless File.exists?("test.gz")
  File.open("test","w"){|f| f.write "helloworld "*1024 }
  `gzip test`
end

require 'zlib'

class Zlib::GzipReader
  class << self
    alias new_orig new
    def new(*args)
     GC.stress=true
      new_orig(*args)
    ensure
     GC.stress=false
    end
  end
end

def parse_gzip(i=0)
  Zlib::GzipReader.new(File.open('test.gz','r'))
end

5.times do |i|
  parse_gzip
end
</code></pre>

$ ruby simple.rb 
simple.rb:13:in `initialize': not in gzip format (Zlib::GzipFile::Error)
	from simple.rb:13:in `new_orig'
	from simple.rb:13:in `new'
	from simple.rb:21:in `parse_gzip'
	from simple.rb:25
	from simple.rb:24:in `times'
	from simple.rb:24


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