Added blurb about "null" threads.

diff --git a/NEWS b/NEWS
index 5965d73..b7fd69f 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,20 @@ Changes since the stable branch:
 
 * Changes to the distribution
 
+** There is a new thread implementation option: "null".
+
+When you configure "--with-threads=null", you will get the usual
+threading API (call-with-new-thread, make-mutex, etc), but you can't
+actually create new threads.
+
+The short term plan is to remove the support for --with-threads=no
+completely so that one doesn't need to special case as much when
+writing code that needs to be thread-aware but should also work
+without threads.
+
+The long term plan is to make the selection of a thread implementation
+a run-time option, not a configure time option.
+
 ** Guile now includes its own version of libltdl.
 
 We now use a modified version of libltdl that allows us to make