From b3214fcb59349efa21e29cb33534d332438bb917 Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Tue, 10 Mar 2020 19:53:25 -0700
Subject: [PATCH] ETHER: Emit advice when asynch operation is attempted without
 USE_READER_THREAD

---
 sim_ether.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sim_ether.c b/sim_ether.c
index 531ac66b..75a70db6 100644
--- a/sim_ether.c
+++ b/sim_ether.c
@@ -1958,7 +1958,8 @@ return NULL;
 t_stat eth_set_async (ETH_DEV *dev, int latency)
 {
 #if !defined(USE_READER_THREAD) || !defined(SIM_ASYNCH_IO)
-char *msg = "Eth: can't operate asynchronously, must poll\n";
+char *msg = "Eth: Can't operate asynchronously, must poll.\n"
+            " *** Build with USE_READER_THREAD defined and link with pthreads for asynchronous operation. ***\n";
 return sim_messagef (SCPE_NOFNC, "%s", msg);
 #else
 int wakeup_needed;