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POLLERR from snd_pcm_poll_descriptors_revents() signals an xrun but was being returned as a BackendSpecificError, causing the poll loop to spin indefinitely. It now falls through to avail(), which returns EPIPE and triggers xrun recovery. Capture streams also require an explicit snd_pcm_start() after snd_pcm_prepare() to re-enter SND_PCM_STATE_RUNNING; without it the stream stalled in PREPARED and poll() timed out repeatedly. POLLHUP/POLLNVAL now stop the stream with StreamError::DeviceNotAvailable instead of looping and poll() returning 0 (timeout/spurious) is now treated as Continue rather than an error. Fixes #730
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The Copilot review seems a valid concern and a pre-existing fragility. I'll think about how to address it. |
TriggerReceiver is now wrapped in Arc and a clone is stored in Stream alongside the sender. Worker threads take their own Arc clone, so dropping the worker no longer closes the read end of the pipe. This means wakeup() in Stream::drop() always writes to an open pipe, even when the worker exited early due to a device error, eliminating the SIGPIPE that would otherwise be raised.
roderickvd
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Pull request overview
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
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This PR has grown quite a bit beyond its original #730 scope so I updated the PR title and text. |
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Fixes
Capture overrun recovery (ALSA: invalid handling of capture overruns #730):
snd_pcm_start()was not called aftersnd_pcm_prepare()when recovering a capture stream from an underrun.POLLERRmishandled as error:POLLERRfromsnd_pcm_poll_descriptors_revents()signals a pending underrun. It was being returned asBackendSpecificError, causing spurious error callbacks and skipping recovery.poll()timeout reported as error:poll()returning 0 (timeout or spurious wakeup) was fired as aBackendSpecificErroron every timeout .Device disconnection looping:
POLLHUP/POLLNVALwere not handled. The worker now stops withStreamError::DeviceNotAvailableon device removal.SIGPIPEon early worker exit: If the worker exited early (e.g. onDeviceNotAvailable) beforeStream::drop()calledwakeup(), the write to the self-pipe's closed read end raisedSIGPIPEEINTRpanic in self-pipe paths:write()/read()on the self-pipe could return-1withEINTRon signal delivery, causingassert_eq!(ret, 8)to panic.Added
Suspend/resume support:
ESTRPIPEfromavail()orwritei()(system suspend) is now handled.Changed
The internal
PollDescriptorsFlowenum andpoll_descriptors_and_prepare_bufferfunction havebeen refactored for simplicity and likeness to
Ready/Pendingvocabulary.Fixes #730