thread.c: refine stream closed message

* thread.c (Init_Thread): [EXPERIMENTAL] refine the "stream
  closed" special exception message, by explicating that it is
  caused by threading.  [ruby-core:80583] [Bug #13405]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58286 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -34,6 +34,10 @@ with all sufficient information, see the ChangeLog file or Redmine
   * IO#pread  [Feature #4532]
   * IO#pwrite  [Feature #4532]
 
+* IOError
+
+  * exception message "stream closed" is changed  [Bug #13405]
+
 * Regexp
   * Update Onigmo 6.1.1.
     * Support absent operator https://github.com/k-takata/Onigmo/issues/82

test/lib/test/unit.rb

@@ -225,7 +225,7 @@ module Test
           rescue Errno::EPIPE
             died
           rescue IOError
-            raise unless ["stream closed","closed stream"].include? $!.message
+            raise unless /stream closed|closed stream/ =~ $!.message
             died
           end
         end

test/lib/test/unit/parallel.rb

@@ -61,7 +61,7 @@ module Test
         begin
           th.join
         rescue IOError
-          raise unless ["stream closed","closed stream"].include? $!.message
+          raise unless /stream closed|closed stream/ =~ $!.message
         end
         i.close
 

thread.c

@@ -4881,7 +4881,8 @@ Init_Thread(void)
     rb_define_method(rb_cThread, "name=", rb_thread_setname, 1);
     rb_define_method(rb_cThread, "inspect", rb_thread_inspect, 0);
 
-    rb_vm_register_special_exception(ruby_error_stream_closed, rb_eIOError, "stream closed");
+    rb_vm_register_special_exception(ruby_error_stream_closed, rb_eIOError,
+				     "stream closed in another thread");
 
     cThGroup = rb_define_class("ThreadGroup", rb_cObject);
     rb_define_alloc_func(cThGroup, thgroup_s_alloc);