Fix problem where a thread can go idle even if there are handlers that are

ready to be dispatched.

Remove need to have a mutex per idle thread.

Remove need to have a mutex per idle thread.


[SVN r39098]

libs/asio

@@ -1 +1 @@
-Subproject commit 2a61b8a501fc6def2ebe808a6a7fec7243c60ac5
+Subproject commit a79f4c70eafbcfdd9b68a2b0eb90d34b69b15e4b