[Gretl-devel] gretl instances

A follow-up to Jack's posting at http://lists.wfu.edu/pipermail/gretl-devel/2013-March/004371.html The question Jack raised was about what happens when you already have gretl running, and you double-click a file for which gretl is registered as the handler (e.g. a .gdt data file or .inp script file). The OS defaults are: (a) for Linux and Windows you'd get the file opened by a new gretl instance, but (b) on OS X (at least with the new gtk-quartz build of gretl) you'd get the file opened in the current gretl instance. To provide choice on this on the OS X side I added (again this is just in the gtk-quartz build) an option to open a new gretl instance if you want. Now on Linux and Windows I've added some functionality to support choice. If you double-click on a gretl-type file this will launch a new gretl instance, but that instance will now, before showing itself, look around to see if gretl is already running. If so, it'll put up a dialog box asking if you want a new instance. And if you say "No" it'll pass a message to the prior instance requesting that the file be opened, then exit. Thi is implemented via the POSIX signals API on Linux, and the Windows Messages API on win32. This is in CVS and the Windows snapshot. Please test, and report any breakage! Thanks. Allin