ZMQ publisher might hang if it sends a message during ctrl + c

the reason is that when calling zmq_close and zmq_term from the same
thread, zmq_close will wait for the message to be sent (but will return
the control to the calling thread)

and then zmq_ctx_destroy will hang forever

see:
https://lists.zeromq.org/pipermail/zeromq-dev/2013-September/022469.html

Signed-off-by: imarom <imarom@cisco.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/publisher/trex_publisher.cpp b/src/publisher/trex_publisher.cpp
index dc37d14c..f5437378 100644
--- a/src/publisher/trex_publisher.cpp
+++ b/src/publisher/trex_publisher.cpp
@@ -73,6 +73,13 @@ TrexPublisher::Create(uint16_t port, bool disable){
 void 
 TrexPublisher::Delete(){
     if (m_publisher) {
+        
+        /* before calling zmq_close set the linger property to zero
+           (othersie zmq_ctx_destroy might hang forever)
+         */
+        int val = 0;
+        zmq_setsockopt(m_publisher, ZMQ_LINGER, &val, sizeof(val));
+        
         zmq_close (m_publisher);
         m_publisher = NULL;
     }