Hello!

This is my first time posting to the group. 

I've been running builds of Python 3.7.x on CentOS Linux release 7.7 
(64bit/Intel Core 2 Duo) 
and I ran into hangs with test_ssl.py when using latest SSL 1.1.1d sources. 

I've done a full compilation from source for Python 3.7.7 and SSL 1.1 in my 
workspaces. 

>From what I can tell the problem is when SSL 1.1 is built with no threading
there is no locking enabled by python. 

This one line change will make the hangs in test_ssl.py  go away:

Index: Modules/_ssl.c
===================================================================
--- Modules/_ssl.c      (revision 70)
+++ Modules/_ssl.c      (working copy)
@@ -5875,7 +5875,7 @@
     if (!_setup_ssl_threads()) {
         return NULL;
     }
-#elif OPENSSL_VERSION_1_1 && defined(OPENSSL_THREADS)
+#elif OPENSSL_VERSION_1_1
     /* OpenSSL 1.1.0 builtin thread support is enabled */
     _ssl_locks_count++;
 #endif


There appears to be an assumption in _ssl.c and test_ssl.y that SSL 1.1 will be 
threaded
but this may not be true (as in my case). 

Appreciate any feedback. Thanks!
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