[sbooth]

No description provided.

[Copilot]

🔵 Needs a closer look

Changing synchronization from an audio render callback has real-time scheduling implications requiring human validation.

Pull request overview

Experiments with Mach semaphore-based event signaling for AudioPlayer.

Changes:

• Adds a Mach semaphore wrapper.
• Signals render events directly.
• Replaces adaptive polling with a 500 ms timed wait.

File summaries

File	Description
AudioPlayer.mm	Updates render-event signaling and waiting.
AudioPlayer.h	Adds the Mach semaphore implementation and member.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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[sbooth]

Time in render():

	Average	Min	Std dev	Max
main	4.08–4.43 µs (≈4.3)	≈1.06 µs	≈3.3 µs	33–49 µs
dsema	12.01–12.36 µs (≈12.2)	≈3.6 µs	≈4.8 µs	40–50 µs
msema	11.15–11.69 µs (≈11.3)	≈3.2 µs	≈4.6 µs	40–60 µs

Frames rendered event delivery time:

	Average	Min	Max	Std dev
main	4.60–4.71 ms	2.8–34 µs	9.41–9.46 ms	≈2.6 ms
dsema	57.8–59.6 µs	7–10 µs	114–121 µs	≈19 µs
msema	59.7–62.1 µs	9–10 µs	129–150 µs	≈18 µs

Applied

[Copilot]

🔵 Needs a closer look

Mach semaphore signaling now runs in the real-time render callback, so deadline impact and concurrent wakeup behavior require macOS/iOS stress validation unavailable in this source-only review.

No open issues 🎉

1 resolved since last review

• Avoid signaling the event thread when no events were queued

_{Review effort: Balanced}