Processes, by default, do not share resources such as memory (you need to take explicit action to share memory between processes).
Tasks, by default, share resources (you should expect that most addresses in one task are valid addresses referring to the same memory in another task within the same process). I tried looking that up, but the current easily searchable formal treatments of these issues are so laden down with jargon and alternatives that I haven't yet found anything which directly discusses this particular issue. I hope this helps, -- Raul On Mon, Jan 11, 2016 at 1:48 PM, Joe Bogner <[email protected]> wrote: > What is lacking from the current task.ijs ? This seems to be the > portable way to deal with tasks. The distinction between process and > task isn't clear to me > > In this specific example: > > fork_jtask_ 'sleep 10' > > returns immediately by appending & (on linux) > > fork_jtask_ > [: 2!:1 '(' , ')&' ,~ ] > fork_jtask_ 'sleep 10' > > ('(' , ')&' ,~ ]) 'sleep 10' > (sleep 10)& > > On Mon, Jan 11, 2016 at 1:40 PM, Eric Iverson <[email protected]> > wrote: >> I agree this (process/task) area is one where J could benefit from new work. >> >> I am pretty sure that the proper framework could be provided for all >> platforms in a portable manner with cd. That is, there is no immediate >> need for jsource changes. >> >> The cd implementation might be adequate, and at worst it would provide >> specs for jsource changes.. >> >> Volunteers?: >> >> On Mon, Jan 11, 2016 at 1:12 PM, Raul Miller <[email protected]> wrote: >>> I was reading >>> https://computinged.wordpress.com/2016/01/11/announcing-a-new-framework-to-define-k-12-computer-science-education/ >>> and his point about processes struck a nerve. >>> >>> A process (as opposed to a task*) is a pretty important concept, and >>> one that we've been sloppy about, in J. >>> >>> 2!:1 is documented as returning '' instead of the process id needed >>> for 2!:3. It's also documented as not working on windows (even under >>> cygwin). I think both of these are mistakes. And on top of that, on a >>> mac: >>> >>> 2!:1 'sleep 3' >>> >>> does not return immediately. At least, not with >>> >>> 9!:14'' >>> j804/j64/darwin/release/commercial/www.jsoftware.com/2015-12-21 18:06:25 >>> >>> (Is chat the right forum for non-beta bug reports?) >>> >>> Thanks, >>> >>> -- >>> Raul >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
