FIX: properly reset all contexts after forking

Fixes hang on backup

lib/discourse.rb

@@ -328,6 +328,9 @@ module Discourse
 
     # in case v8 was initialized we want to make sure it is nil
     PrettyText.reset_context
+
+    Tilt::ES6ModuleTranspiler.reset_context if defined? Tilt::ES6ModuleTranspiler
+    JsLocaleHelper.reset_context if defined? JsLocaleHelper
     nil
   end
 

lib/es6_module_transpiler/tilt/es6_module_transpiler_template.rb

@@ -33,6 +33,10 @@ JS
       ctx
     end
 
+    def self.reset_context
+      @ctx = nil
+    end
+
     def self.v8
       return @ctx if @ctx
 

lib/js_locale_helper.rb

@@ -165,6 +165,10 @@ module JsLocaleHelper
     result
   end
 
+  def self.reset_context
+    @ctx = nil
+  end
+
   @mutex = Mutex.new
   def self.with_context
     @mutex.synchronize do

script/check_forking.rb

@@ -0,0 +1,28 @@
+require File.expand_path("../../config/environment", __FILE__)
+
+def pretty
+  puts "<before>"
+  puts PrettyText.cook("My pid is #{Process.pid}")
+end
+
+Discourse.after_fork
+pretty
+
+child = fork do
+  Discourse.after_fork
+  pretty
+  grand_child = fork do
+    Discourse.after_fork
+    pretty
+    puts "try to exit"
+    Process.kill "KILL", Process.pid
+  end
+  puts "before wait 2"
+  Process.wait grand_child
+  puts "after wait 2"
+  Process.kill "KILL", Process.pid
+end
+
+puts "before wait 1"
+Process.wait child
+puts "after wait 1"