another example

diff --git a/examples/timing.f b/examples/timing.f
new file mode 100755 (executable)
index 0000000..61d5c0c
--- /dev/null
+++ b/examples/timing.f
@@ -0,0 +1,36 @@
+#!/home/ralph/src/devuan/rrqforth/rrqforth
+#
+# This example adds the words:
+# time0 = variable for holding a time stamp
+# time = function to read of current time; seconds since epoch
+# marktime = function that sets time0 from current time
+# telltime = function that prints the difference between current time and time0
+# longloop = test function for simple timing test
+
+INPUT @ READ-WORD time0 CREATE DROP 0 , ( variable time0 )
+
+: time ( -- s ; seconds since epoch )
+  0 [ SYSTEM USE SYS_TIME TFA>CFA , ]
+;
+
+: marktime ( -- ; set time0 from current time )
+  time time0 !
+;
+
+: telltime ( -- s ; read off time since time0 )
+  time time0 @ - .
+;
+
+: longloop ( n -- )
+  S" Takes " TELL marktime
+  0 BEGIN
+    1 + 2DUP <= IFBREAK
+  AGAIN 2DROP
+  telltime S"  seconds" TELL NL EMIT
+;
+
+1000000000 4 /
+" Test run a tight loop of " TELL DUP . "  cycles" TELL NL EMIT
+longloop
+
+0 EXIT