[mythtv-commits] Ticket #13072: Schedule busy looping with sched_sleep of 0

[MythTV]

#13072: Schedule busy looping with sched_sleep of 0
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 Reporter:  lucylangthorne55@…    |          Owner:  gigem
     Type:  Bug Report - General  |         Status:  infoneeded_new
 Priority:  minor                 |      Milestone:  unknown
Component:  MythTV - Scheduling   |        Version:  0.28.0
 Severity:  medium                |     Resolution:
 Keywords:                        |  Ticket locked:  0
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Comment (by lucylangthorne55@…):

 Patch is against 7a1ab5001cb0f9576a913f012fcda773590d6c95 (v29) whereas
 original issue was against 0.28.

 (I would've mentioned it earlier but I was blocked for an hour as spam for
 too many posts).

 Looking at the log, it suggests that since we woke at 14:28:56 with a next
 start time of 14:30, the HandleRecording doesn't update nextWakeTime since
 it always takes the min and 14:28:56 is less than "14:30-preroll of 60
 seconds" for the >0 case.

 This means we'll always sleep for zero seconds and busy loop.

 I'll add a bit more debug and schedule a few more programmes later to see
 what else is going on.

 I don't know if the logic of the reclist allows us to
 unlock/sched_yield/relock the mutex each time around the doRun loop to
 give the frontend/mythweb a chance of grabbing the mutex so they don't get
 blocked for the few minutes.

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Ticket URL: <https://code.mythtv.org/trac/ticket/13072#comment:10>
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