BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Deadlock using Load.ASYNCHRONOUS          BorlandTalk.com Forum Index -> JBuilder Databases View previous topic :: View next topic   Author Message Nicolas GASNIER Guest Posted: Thu Mar 15, 2007 8:00 pm    Post subject: Deadlock using Load.ASYNCHRONOUS Hi, I want to improve my user interface reactivity by setting the Load.ASYNCHRONOUS option on my QueryDataSet. On this dataset, I have a "navigated" event I use to refresh two other datasets based on the the current row ID (I don't want to use mastelinks, the detail dataset would be too big). But this sometimes causes deadlocks between the event thread and the thread of the provider. I think the first dataset I'm trying to refresh wait for the QueryProvider to be released by the main dataset, but for a reason I don't really understand, the main dataset is waiting for that too. Does anyone experienced such problem, and how did you manage to solve it ? Regards. Back to top John Moore (TeamB) Guest Posted: Fri Mar 16, 2007 11:48 pm    Post subject: Re: Deadlock using Load.ASYNCHRONOUS Nicolas GASNIER wrote: Quote: Hi, I want to improve my user interface reactivity by setting the Load.ASYNCHRONOUS option on my QueryDataSet. On this dataset, I have a "navigated" event I use to refresh two other datasets based on the the current row ID (I don't want to use mastelinks, the detail dataset would be too big). But this sometimes causes deadlocks between the event thread and the thread of the provider. I think the first dataset I'm trying to refresh wait for the QueryProvider to be released by the main dataset, but for a reason I don't really understand, the main dataset is waiting for that too. Does anyone experienced such problem, and how did you manage to solve it ? I have not experienced this problem, nor do I remember anyone reporting it here.. Some questions: 1) You imply that both the detail and master datasets are using the "same" instance of QueryProvider. Is that correct? 2) If so I would question the wisdom of this.. (DX if left to it's defaults creates a new instance of the default QueryProvider for each instance of QueryDataSet. (example out of DX QueryDataSet source**) if (currentProvider == null) { setQueryProvider(new QueryProvider()); currentProvider.setAccumulateResults(accumulateResults); } ...where.. private void setQueryProvider(QueryProvider provider) /*-throws DataSetException-*/ { super.setProvider(provider); currentProvider = (QueryProvider)provider; } So.. I would guess you could be doing something else that is forcing the QueryDataSet to share a Provider.. (Maybe you should not be doing that..??) Hope that helps.. John.. -- ============================================= TeamB are volunteer helpers. Please DO NOT REPLY VIA EMAIL! Post all questions and replies to this newsgroup ONLY For papers on DataExpress, Applets, JSP, and Web Development go to: http://www.microps.com/mps/paperFAQ.html ==================================================== Back to top Nicolas GASNIER Guest Posted: Fri Mar 30, 2007 6:29 pm    Post subject: Re: Deadlock using Load.ASYNCHRONOUS Quote: Some questions: 1) You imply that both the detail and master datasets are using the "same" instance of QueryProvider. Is that correct? I tried the JBuilder deadlock monitor to find where the lock is, and it seems to happen between two threads that wait for the monitor on the provider. Quote: 2) If so I would question the wisdom of this.. (DX if left to it's defaults creates a new instance of the default QueryProvider for each instance of QueryDataSet. (example out of DX QueryDataSet source**) ..... So.. I would guess you could be doing something else that is forcing the QueryDataSet to share a Provider.. (Maybe you should not be doing that..??) I never change the provider, it is always left to default. May the lock be due to the fact that two dataset, event with different providers, can't provide simultaneously ? When I launch my app main window, there is two components that will open their respective dataset, and sometimes they are in conflict to get a lock on something internal to data express... Quote: Hope that helps.. John.. -- ============================================= TeamB are volunteer helpers. Please DO NOT REPLY VIA EMAIL! Post all questions and replies to this newsgroup ONLY For papers on DataExpress, Applets, JSP, and Web Development go to: http://www.microps.com/mps/paperFAQ.html ==================================================== Back to top John Moore (TeamB) Guest Posted: Sat Mar 31, 2007 2:14 am    Post subject: Re: Deadlock using Load.ASYNCHRONOUS Nicolas GASNIER wrote: Quote: I never change the provider, it is always left to default. May the lock be due to the fact that two dataset, event with different providers, can't provide simultaneously ? When I launch my app main window, there is two components that will open their respective dataset, and sometimes they are in conflict to get a lock on something internal to data express... Since I've never encountered this before and have never heard of anyone else encountering that has reported here... I don't have much to suggest.. I would look and see if maybe the driver is where the problem is occuring.. Sorry I could not be more help on this.. John.. -- ============================================= TeamB are volunteer helpers. Please DO NOT REPLY VIA EMAIL! 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