> On Aug 14, 2015, at 5:46 PM, Carl Hoefs <newsli...@autonomy.caltech.edu> > wrote: > > >> On Aug 14, 2015, at 4:15 PM, Ken Thomases <k...@codeweavers.com> wrote: >> >> You'll need to create a new operation each time you want to queue a >> particular invocation. > > Yes, I'm doing that. The problem is finding a mechanism to re-queue a new > operation from the current one after it is done, so the queue can be empty > for a time.
Here's what I'm trying to do, but in code rather than words: . . . [self doStatusChecks]; // start endless checking at 1-min intervals . . . - (void)doStatusChecks { [jobQueue addOperation:[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(checkStatus) object:nil]]; } - (void)checkStatus { // Access device & read status // If bad, do work... // Enqueue another operation, but after 60 sec delay [self performSelector:@selector(doStatusChecks) withObject:nil afterDelay:60.0]; // <-- This never fires! [self doStatusChecks]; // <-- Fires immediately, but not what I want } -Carl _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com