Scalability improvements for large amounts of connections

Add signaler_sndbuf_size option to config.hpp which allows the user to
increase the size of the send buffer used by the signalling socketpair.

Implement random backoff for reconnection attempts using a primitive
pseudo-random generation to prevent reconnection storms.

Add wait_before_connect option to config.hpp to allow the user to enable
random delay even on initial connect. Default is false for low latency.

Signed-off-by: Martin Lucina <mato@kotelna.sk>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/zmq_connecter.hpp b/src/zmq_connecter.hpp
index 16bfc31..7a516f0 100644
--- a/src/zmq_connecter.hpp
+++ b/src/zmq_connecter.hpp
@@ -56,6 +56,9 @@ namespace zmq
         //  Internal function to start the actual connection establishment.
         void start_connecting ();
 
+        //  Internal function to return the reconnect backoff delay.
+        int get_reconnect_period ();
+
         //  Actual connecting socket.
         tcp_connecter_t tcp_connecter;