trace.cpuLogWrite[1].Store(nil)
	trace.cpuLogRead[0].close()
	trace.cpuLogRead[1].close()
	trace.cpuSleep.wake()

	// Wait until the logger goroutine exits.
	<-trace.cpuLogDone

	// Clear state for the next trace.
	trace.cpuLogDone = nil
	trace.cpuLogRead[0] = nil
	trace.cpuLogRead[1] = nil
	trace.cpuSleep.close()
}

// traceReadCPU attempts to read from the provided profBuf[gen%2] and write

	cpuLogWrite [2]atomic.Pointer[profBuf] // copy of cpuLogRead for use in signal handlers, set without signalLock
	cpuSleep    *wakeableSleep
	cpuLogDone  <-chan struct{}
	cpuBuf      [2]*traceBuf

	reader atomic.Pointer[g] // goroutine that called ReadTrace, or nil

	// Fast mappings from enumerations to string IDs that are prepopulated
	// in the trace.