Yeah, in the old days of data bases we used to call that ac”deadly embrace”
Regards and 73s VE3FBZ London Amateur Radio Club www.larc.ca > On Jul 6, 2019, at 14:54, Rick Drexel <rdre...@msn.com> wrote: > > Your observations match those I have seen for about a year. I've tried to > find a common set of circumstances that always cause the failure but have had > no luck. I use WSJT-X in FT8 receive mode and PSKREPORTER to check band > performance over a long time period. After a random amount of time, WSJT-X > come to a halt. Specifically the Wide Graph Display and the Band Activity > Display stop updating. The UTC in the Wide Graph Display no longer matches > the UTC in the bottom left portion of the Main window. There is no > correlation between the activity on the band and the time it takes to hang. > Rarely does it not hang. > > As a software developer this has all the hallmarks of a race condition > failure. Two (or more) threads update a shared resource without using a > LOCK, UPDATE, UNLOCK sequence. During a thread context swap one of the > threads reads the value, loses control to another thread that updates the > value, then the first thread gets scheduled and writes back its stale value. > The result is undefined behavior. > > Most of the time there is no conflict. Even under a heavy load. Then it > fails unexpectedly. This makes it extremely difficult to debug. > > To recover I have to exit out of WSJT-X and restart it. > > This might not be the root cause but I would put it high on my list of the > usual suspects. > > 73, Rick > WK1P > > > From: Peter Putnam <pe...@ni6e.com> > Sent: Wednesday, July 3, 2019 3:06 PM > To: wsjt-devel@lists.sourceforge.net > Subject: [wsjt-devel] WSJT Audio Input Loss > > Greetings, > > I have been using WSJT-X quite successfully for several years during > June VHF Contests. I experienced a failure of the WSJT program to accept > received audio input after several hours of proper operation during the > recent Field Day exercise. > > I'll provide a brief outline and reply with more detail, should it be > needed. > > My computer is a Dell Optiplex 780 running Win 7 Pro SP1, 64-bit. The > WSJT-X software version is 2.0.1 7ddcb7. > > My receiver is a Flex 6500. It passes data to a Flex-supplied "DAX" > program that interfaces various applications that wish to receive the > audio stream. WSJT accepts the stream and displays results on the Wide > Graph and a small audio signal-strength window. Activity proceeded > normally for the first three hours of Field Day, until both the Wide > Graph and the audio signal-strength stopped showing any incoming audio. > > I can't offer any help on what might have caused the problem. It was > abrupt and seemingly unrelated to any other system actions. I am unable > to reproduce the problem. > > Several operators spent several hours speculating about what a solution > might be. Program restarts and computer re-boots (time-tested favorite > of generations) changed nothing. The only useful clue was that the DAX > audio output stream was present and could be re-directed to Fldigi, but > not to WSJT-X. > > I was able to restore operation for a brief period by stopping WSJT, > renaming WSJT.ini and restarting WSJT. That fix lasted for a half hour. > Repeating the procedure provided operation for the rest of Field Day. > > The two .ini files that were renamed are available for your inspection, > along with the one that continued to function. > > Any suggestions you can offer to prevent a recurrence would be greatly > appreciated. > > Regards, > Peter > NI6E > > > > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Fwsjt-devel&data=02%7C01%7C%7Cc8a88765c47b45e54e0208d6ffea13fc%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636977778175354267&sdata=QIhhN8eBXU7WkgMKIK4WOGh%2BO2Zt6d3mRyQ5qFFV%2FGM%3D&reserved=0 > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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