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Breaks a potential deadlock.

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This commit is contained in:
Thomas Harte 2020-01-22 22:10:20 -05:00
parent 8404409c0d
commit 3c6a00dc3c
1 changed files with 13 additions and 4 deletions
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17
OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift
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@ -225,16 +225,25 @@ class MachineDocument:
}
func machineSpeakerDidChangeInputClock(_ machine: CSMachine) {
setupAudioQueueClockRate()
// setupAudioQueueClockRate not only needs blocking access to the machine,
// but may be triggered on an arbitrary thread by a running machine, and that
// running machine may not be able to stop running until it has been called
// (e.g. if it is currently trying to run_until an audio event). Break the
// deadlock with an async dispatch.
DispatchQueue.main.async {
self.setupAudioQueueClockRate()
}
}
private func setupAudioQueueClockRate() {
// establish and provide the audio queue, taking advice as to an appropriate sampling rate
// Establish and provide the audio queue, taking advice as to an appropriate sampling rate.
//
// TODO: this needs to be threadsafe. FIX!
let maximumSamplingRate = CSAudioQueue.preferredSamplingRate()
let selectedSamplingRate = self.machine.idealSamplingRate(from: NSRange(location: 0, length: NSInteger(maximumSamplingRate)))
if selectedSamplingRate > 0 {
audioQueue = CSAudioQueue(samplingRate: Float64(selectedSamplingRate))
audioQueue.delegate = self
self.audioQueue = CSAudioQueue(samplingRate: Float64(selectedSamplingRate))
self.audioQueue.delegate = self
self.machine.audioQueue = self.audioQueue
self.machine.setAudioSamplingRate(selectedSamplingRate, bufferSize:audioQueue.preferredBufferSize)
}