[wanproxy/wanproxy] 6cf224: Synchronize cancellations using locks.

[Juli Mallett]

  Branch: refs/heads/master
  Home:   https://github.com/wanproxy/wanproxy
  Commit: 6cf2245259886ad1d282eb1487dfaaba638bc399
      https://github.com/wanproxy/wanproxy/commit/6cf2245259886ad1d282eb1487dfaaba638bc399
  Author: Juli Mallett <juli at clockworksquid.com>
  Date:   2015-06-04 (Thu, 04 Jun 2015)

  Changed paths:
    M event/action.h
    M event/callback_thread.cc
    M http/http_server_pipe.cc
    M io/io_system.cc
    M io/io_system_handle.cc
    M io/net/tcp_client.cc
    M io/net/udp_client.cc
    M io/pipe/pipe_producer.cc
    M io/pipe/pipe_splice.cc
    M io/pipe/splice.cc
    M io/pipe/splice_pair.cc
    M io/socket/socket_handle.cc
    M programs/wanproxy/ssh_stream.cc
    M ssh/ssh_transport_pipe.cc

  Log Message:
  -----------
  Synchronize cancellations using locks.