update the RB_UBF_DL for more recent versions of Ruby 1.9, which doesn't have it

ext/extconf.rb

@@ -31,8 +31,9 @@ else
   exit 1
 end
 
-if have_func('rb_thread_blocking_region') and have_macro('RB_UBF_DFL', 'ruby.h')
-  flags << "-DHAVE_TBR"
+# check for 1.9
+if have_func('rb_thread_blocking_region') and have_macro('RUBY_UBF_IO', 'ruby.h')
+  $CFLAGS += " -DHAVE_TBR "
 end
 
 # make mysql constant
@@ -71,9 +72,4 @@ File.open('error_const.h', 'w') do |f|
   end
 end
 
-# check for 1.9
-if have_func('rb_thread_blocking_region') and have_macro('RB_UBF_DFL', 'ruby.h')
-  $CFLAGS += " -DHAVE_TBR"
-end
-
 create_makefile("mysql")

ext/mysql.c

@@ -711,17 +711,16 @@ static VALUE store_result(VALUE obj)
     MYSQL_RES* res = NULL;
 #ifndef HAVE_TBR
     res = mysql_store_result(m);
-    //store_result_to_location(m, &res);
 #else
     mysql_result_to_here_t linker;
     linker.mysql_instance = m;
     linker.store_it_here = &res;
-    //store_result_to_location((void *) &linker);
-    rb_thread_blocking_region(store_result_to_location, (void *) &linker, RB_UBF_DFL, 0);
+    rb_thread_blocking_region(store_result_to_location, (void *) &linker, RUBY_UBF_IO, 0); /* not sure if this should be RUBY_UBF_IO or RUBY_UBF_PROCESS here -- see Ruby 1.9 ChangeLog */
 #endif
  
     if (res == NULL)
 	mysql_raise(m);
+
     return mysqlres2obj(res);
 }
 

test/test_all_hashes.rb

@@ -1,7 +1,8 @@
 # shows the effect of using .all_hashes instead of looping on each hash 
 # run it by substiting in a 'long' [many row] query for the query variable and toggling use_all_hashes here at the top
 # note that we load all the rows first, then run .all_hashes on the result [to see more easily the effect of all hashes]
-# on my machine and a 200_000 row table, it took 3.38s versus 3.65s
+# on my machine and a 200_000 row table, it took 3.38s versus 3.65s for the old .each_hash way [note also that .each_hash is 
+# almost as fast, now, as .all_hashes--they've both been optimized]
 require 'mysqlplus'
 
 use_the_all_hashes_method = true