From: "Muhammad Ali S." <lists@...>
Date: 2013-07-11T23:52:38+09:00
Subject: Embedding Ruby in a Multi-threaded C++ Application

Hi,

I am trying to embed Ruby 2.0.0-p195 in a multi-threaded VC++
application for MS Windows.

The same application previously made successful use of Ruby version
1.8.7-p374 without any problems but the later versions of Ruby are
causing various issues. The overall approach in my C++ application
hasn't changed.

The way it works is that my core application loads a DLL, where I
initialise Ruby in DllMain:

With 1.8.7:
----------
NtInitialize (&argc, &argv);
ruby_init();

With 2.0.0:
---------
ruby_sysinit(&argc, &argv);
RUBY_INIT_STACK;
ruby_init();


I then load call the following sequence of functions in a different
thread to invoke a Ruby function in a given .rb file. The code is same
for 1.8.7 and 2.0.0:

ruby_icnpush (pathToMyRbFile);
ruby_init_loadpath();

ruby_sript (myRubyFile);
rb_load_protect (rb_str_new2 (myRubyFile), 0, &status);

It works for 1.8.7 but for 2.0.0 the rb_str_new2 call fails. If I check
the reason I can get the class of the error but not the exact error
string. The class I get is SystemStackError.

Any hints/ pointers will be highly appreciated. I know this is mainly
due to a multi-threaded environment. But the interesting thing is that
Ruby 1.8.7 works fine with this approach.

Regards,
Muhammad

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