changed from Mutex to Monitor

CHANGES

@@ -34,6 +34,9 @@
 * Changed RDoc test task to have no default template. This makes it
   easier for the tempate to pick up the template from the environment.
 
+* Changed from using Mutex to Monitor. Evidently Mutex causes thread
+  join errors when Ruby is compiled with -disable-pthreads.
+
 == Version 0.8.1
 
 * Removed requires on parsedate.rb (in Ftptools)

lib/rake.rb

@@ -35,7 +35,7 @@
 require 'getoptlong'
 require 'fileutils'
 require 'singleton'
-require 'thread'
+require 'monitor'
 require 'optparse'
 require 'ostruct'
 
@@ -461,7 +461,7 @@ def initialize(task_name, app)
       @already_invoked = false
       @full_comment = nil
       @comment = nil
-      @lock = Mutex.new
+      @lock = Monitor.new
       @application = app
       @scope = app.current_scope
       @arg_names = nil