Including the mutex fix for folks by default.

git-svn-id: svn+ssh://rubyforge.org/var/svn/mongrel/trunk@379 19e92222-5c0b-0410-8929-a290d50e31e9

lib/mutex_fix.rb

@@ -0,0 +1,34 @@
+require 'thread'
+
+# monkey patch Mutex so it does not leak memory.
+class Mutex
+
+  def lock
+    while (Thread.critical = true; @locked)
+      @waiting.unshift Thread.current
+      Thread.stop
+    end
+    @locked = true
+    Thread.critical = false
+    self
+  end
+  
+  def unlock
+    return unless @locked
+    Thread.critical = true
+    @locked = false
+    begin
+      t = @waiting.pop
+      t.wakeup if t
+    rescue ThreadError
+      retry
+    end
+    Thread.critical = false
+    begin
+      t.run if t
+    rescue ThreadError
+    end
+    self
+  end
+  
+end