Initial data commit

Task/Concurrent-computing/OoRexx/concurrent-computing.rexx

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+-- this will launch 3 threads, with each thread given a message to print out.
+-- I've added a stoplight to make each thread wait until given a go signal,
+-- plus some sleeps to give the threads a chance to randomize the execution
+-- order a little.
+launcher = .launcher~new
+launcher~launch
+
+::class launcher
+-- the launcher method.  Guarded is the default, but let's make this
+-- explicit here
+::method launch guarded
+
+  runner1 = .runner~new(self, "Enjoy")
+  runner2 = .runner~new(self, "Rosetta")
+  runner3 = .runner~new(self, "Code")
+
+  -- let's give the threads a chance to settle in to the
+  -- starting line
+  call syssleep 1
+
+  guard off   -- release the launcher lock.  This is the starter's gun
+
+-- this is a guarded method that the runners will call.  They
+-- will block until the launch method releases the object guard
+::method block guarded
+
+::class runner
+::method init
+  use arg launcher, text
+  reply  -- this creates the new thread
+
+  call syssleep .5  -- try to mix things up by sleeping
+  launcher~block    -- wait for the go signal
+  call syssleep .5  -- add another sleep here
+  say text