Implement flow control

This commit introduces the necessary changes necessary
for implementing flow control. None of the socket types
implements the flow control yet. The code will crash when
the flow control is enabled and the thw lwm is reached.

The following commits will add flow-control support for
individual socket types.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/pgm_receiver.hpp b/src/pgm_receiver.hpp
index 3f0ef81..dd9402f 100644
--- a/src/pgm_receiver.hpp
+++ b/src/pgm_receiver.hpp
@@ -54,6 +54,7 @@ namespace zmq
         void plug (struct i_inout *inout_);
         void unplug ();
         void revive ();
+        void resume_input ();
         void add_prefix (const blob_t &identity_);
         void trim_prefix ();