3 Commits

Author	SHA1	Message	Date
Scott Shawcroft	d2860b58b0	Check background pending before sleep ... There is a race between when we run background tasks and when we sleep. If an interrupt happens between the two, then we may delay executing the background task. On some ports we checked this for TinyUSB already. On iMX RT, we didn't which caused USB issues. This PR makes it more generic for all background tasks including USB. Fixes #5086 and maybe others.	2021-08-19 12:18:13 -07:00
Jeff Epler	a18a392109	background_callback: Add gc collect callback ... A background callback must never outlive its related object. By collecting the head of the linked list of background tasks, this will not happen. One hypothetical case where this could happen is if an MP3Decoder is deleted while its callback to fill its buffer is scheduled.	2020-07-17 08:36:26 -05:00
Jeff Epler	1474fccd2f	supervisor: Add a linked list of background callbacks ... In time, we should transition interrupt driven background tasks out of the overall run_background_tasks into distinct background callbacks, so that the number of checks that occur with each tick is reduced.	2020-07-15 09:26:47 -05:00