c# - UWP - Headless app stops after 3 or 4 hours -


i have headless uwp app supposed data sensor every 10 minutes , send cloud. when run code headless app on raspberry pi stops measuring after 3 or 4 hours, no error (i have lot of logs). 3 or 4 hours. if start app @ 8, @ 11 or 12 stops...

it looks stopped because have cancellation token in place worked in tests, here not firing anymore. on app manager in device portal appears app running.

i noticed in performance page in device portal memory goes down 8 mb during measurements.

the strange thing ran same code headed app on rpi , on laptop , went well. worked continuously on 16 hours until stopped it. on both laptop , rpi there no memory issue, app used same amount of ram on whole period.

what cause behavior when running headless app?

here how call code headless app:

backgroundtaskdeferral deferral;         private isettingsreader settings;         private ilogger logger;         private iflowmanager<palmsensemeasurement> flow;         private iserviceprovider services;         ibackgroundtaskinstance mytaskinstance;          public async void run(ibackgroundtaskinstance taskinstance)         {             taskinstance.canceled += taskinstance_canceled;              deferral = taskinstance.getdeferral();              mytaskinstance = taskinstance;              try             {                 setproperties();                  var flowtask = flow.runflowasync();                  await flowtask;             }             catch (exception ex)             {                  logger.logcritical("#####---->exception occured in startuptask (run): {0}", ex.tostring());             }          }          private void setproperties()         {             services = sensorhubcontainer.services;              settings = services.getservice<isettingsreader>();              flow = services.getservice<iflowmanager<palmsensemeasurement>>();              logger = services.getservice<ilogger<startuptask>>();         }          private void taskinstance_canceled(ibackgroundtaskinstance sender, backgroundtaskcancellationreason reason)         {                logger.logdebug("startuptask.taskinstance_canceled() - {0}", reason.tostring());             deferral.complete();         }

and here how call code headed app:

private async task getmeasurementsasync()         {              try             {                  flow = services.getservice<iflowmanager<palmsensemeasurement>>();                  await flow.runflowasync();              }             catch (exception ex)             {                  measurements.add(new measurementresult() { errormessage = ex.message });             }          }

the runflowasync method looks this:

public async task runflowasync()         {              var loopinterval = settings.noofsecondsforloopinterval;               while (true)             {                 try                 {                     logger.loginformation("starting new loop in {0} seconds...", loopinterval);                      //check previous unsent files                     await resender.tryresendmeasuresasync();                      await task.delay(timespan.fromseconds(loopinterval));                      await domeasureandsend();                      logger.loginformation("loop finished");                   }                 catch (exception ex)                 {                     logger.logerror("error in flow<{0}>! error {1}", typeof(t).fullname, ex); #if debug                     debug.writeline(ex.tostring()); #endif                 }             }         }

the problem 3rd party library had use , had called differently headless app. internally creating own taskscheduler if synchronizationcontext.current null.


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