Do not run File.write while Ractors are running

also make sure all local variables have the __bmdv_ prefix.

benchmark/lib/benchmark_driver/runner/ractor.rb

@@ -66,29 +66,32 @@ Warning[:experimental] = false
 #{prelude}
 
 if #{loop_count} == 1
-  __bmdv_empty_before = 0
+  __bmdv_loop_before = 0
-  __bmdv_empty_after = 0
+  __bmdv_loop_after = 0
 else
-  __bmdv_empty_before = Time.new
+  __bmdv_loop_before = Time.new
   #{while_loop('', loop_count, id: 0)}
-  __bmdv_empty_after = Time.new
+  __bmdv_loop_after = Time.new
 end
 
-ractors = []
+__bmdv_ractors = []
-<% results.each  do |result| %>
+<% results.size.times  do %>
-ractors << Ractor.new(__bmdv_empty_after - __bmdv_empty_before) { |loop_time|
+__bmdv_ractors << Ractor.new(__bmdv_loop_after - __bmdv_loop_before) { |__bmdv_loop_time|
   __bmdv_time = Time
   __bmdv_script_before = __bmdv_time.new
   #{while_loop(script, loop_count, id: 1)}
   __bmdv_script_after = __bmdv_time.new
 
-  File.write(
+  (__bmdv_script_after - __bmdv_script_before) - __bmdv_loop_time
-    <%= result.dump %>,
-    ((__bmdv_script_after - __bmdv_script_before) - loop_time).inspect,
-  )
 }
 <% end  %>
-ractors.each(&:take)
+
+# Wait for all Ractors before executing code to write results
+__bmdv_ractors.map!(&:take)
+
+<% results.each  do |result| %>
+File.write(<%= result.dump %>, __bmdv_ractors.shift)
+<% end  %>
 
 #{teardown}
       RUBY