2!:1 is not truly asynchronous in JHS, it seems. The net result is that I cannot see how to launch a child process without the session hanging until the child terminates.
Strange to say, the jijx session immediately resumes, and will accept (re-)input. But it will not execute the inputted expression. Inside a verb however, execution continues past 2!:1 (which successfully forks the child process), but after completion of the verb the session is silent (until the child process is terminated). Example: Suppose test6s.wav is a sound file lasting 6 seconds. (Chosen to last long enough to allow "i.6" to be entered.) 2!:1 'afplay ~/wav/test6s.wav &' i.6 0 1 2 3 4 5 The jijx accepts i.6 but hangs until test6s.wav finishes playing. Only then does 0 1 2 3 4 5 appear. JVERSION Engine: j701/2011-01-10/11:25 build: Feb 6 2011 16:16:29 Library: 7.01.055 Platform: Darwin 64 Installer: j701a_mac64.dmg ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
