ZeroCopyReturnValue: Add structure to return ZMQ zero copy buffer

common/ZMQWrappers.cpp

@@ -77,19 +77,19 @@ void ZMQSocket::Send(zmq_msg_t *msg) {
 }
 
 void zmq_socket_free(void *data, void *hint) {
-    auto s = (std::binary_semaphore *) hint;
-    s->release();
+    auto z = (ZeroCopyReturnValue *) hint;
+    z->fifo->Put(z->handle);
 }
 
-void ZMQSocket::SendZeroCopy(const void *buf, size_t buf_size, std::binary_semaphore *sempahore) {
+void ZMQSocket::SendZeroCopy(const void *buf, size_t buf_size, ZeroCopyReturnValue *zero_copy_ret_val) {
     std::unique_lock<std::mutex> ul(m);
     zmq_msg_t msg;
-    if (zmq_msg_init_data(&msg, const_cast<void *>(buf), buf_size, zmq_socket_free, sempahore) != 0) {
-        sempahore->release();
+    if (zmq_msg_init_data(&msg, const_cast<void *>(buf), buf_size, zmq_socket_free, zero_copy_ret_val) != 0) {
+        zero_copy_ret_val->release();
         throw JFJochException(JFJochExceptionCategory::ZeroMQ, "zmq_msg_init_data failed");
     }
     if (zmq_msg_send(&msg, socket, 0) < 0) {
-        sempahore->release();
+        zero_copy_ret_val->release();
         throw JFJochException(JFJochExceptionCategory::ZeroMQ, "zmq_msg_send failed");
     }
 }