ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
	if ret >= 0 {
		return uintptr(out)
	}
	return 0
}

//go:nosplit
func futexsleep(addr *uint32, val uint32, ns int64) {
	systemstack(func() {
		futexsleep1(addr, val, ns)
	})
}

func futexsleep1(addr *uint32, val uint32, ns int64) {
	var timeout int32
	if ns >= 0 {
		// The timeout is specified in microseconds - ensure that we

		tp       unsafe.Pointer
	}{_CLOCK_MONOTONIC, unsafe.Pointer(&ts)}
	if errno := libcCall(unsafe.Pointer(abi.FuncPCABI0(clock_gettime_trampoline)), unsafe.Pointer(&args)); errno < 0 {
		// Avoid growing the nosplit stack.
		systemstack(func() {
			println("runtime: errno", -errno)
			throw("clock_gettime failed")
		})
	}
	return ts.tv_sec*1e9 + int64(ts.tv_nsec)
}
func clock_gettime_trampoline()

//go:nosplit

	// Do this check last because it is more expensive and rarely true.
	// If it is false the expense doesn't matter since we are crashing.
	if inPersistentAlloc(uintptr(unsafe.Pointer(dst))) {
		return
	}

	systemstack(func() {
		println("write of unpinned Go pointer", hex(uintptr(src)), "to non-Go memory", hex(uintptr(unsafe.Pointer(dst))))
		throw(cgoWriteBarrierFail)
	})
}

	w, _ = w.ensure(1 + traceBytesPerNumber /* traceEvFrequency + frequency */)

	// Write out the string.
	w.byte(byte(traceEvFrequency))
	w.varint(traceClockUnitsPerSecond())

	// Immediately flush the buffer.
	systemstack(func() {
		lock(&trace.lock)
		traceBufFlush(w.traceBuf, gen)
		unlock(&trace.lock)
	})

//go:nosplit
func semawakeup(mp *m) {
	atomic.Xadd(&mp.waitsemacount, 1)
	ret := thrwakeup(uintptr(unsafe.Pointer(&mp.waitsemacount)), 1)
	if ret != 0 && ret != _ESRCH {
		// semawakeup can be called on signal stack.
		systemstack(func() {
			print("thrwakeup addr=", &mp.waitsemacount, " sem=", mp.waitsemacount, " ret=", ret, "\n")
		})
	}
}

func osinit() {
	ncpu = getncpu()
	physPageSize = getPageSize()
}

		// and this way we can allow write barriers in the
		// panic path.
		getg().m.p.ptr().wbBuf.discard()
		return
	}

	// Switch to the system stack so we don't have to worry about
	// safe points.
	systemstack(func() {
		wbBufFlush1(getg().m.p.ptr())
	})
}

// wbBufFlush1 flushes p's write barrier buffer to the GC work queue.
//
// This must not have write barriers because it is part of the write

// newcoro creates a new coro containing a
// goroutine blocked waiting to run f
// and returns that coro.
func newcoro(f func(*coro)) *coro {
	c := new(coro)
	c.f = f
	pc := getcallerpc()
	gp := getg()
	systemstack(func() {
		mp := gp.m
		start := corostart
		startfv := *(**funcval)(unsafe.Pointer(&start))
		gp = newproc1(startfv, gp, pc, true, waitReasonCoroutine)

		// Scribble down locked thread state if needed and/or donate

// has completed and that there are no more writers to it.
func traceCPUFlush(gen uintptr) {
	// Flush any remaining trace buffers containing CPU samples.
	if buf := trace.cpuBuf[gen%2]; buf != nil {
		systemstack(func() {
			lock(&trace.lock)
			traceBufFlush(buf, gen)
			unlock(&trace.lock)
			trace.cpuBuf[gen%2] = nil
		})
	}
}

// traceCPUSample writes a CPU profile sample stack to the execution tracer's