KeepAlive(new)
	KeepAlive(old)
}
func sigprocmask_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func sigaltstack(new *stackt, old *stackt) {
	if new != nil && new.ss_flags&_SS_DISABLE != 0 && new.ss_size == 0 {
		// Despite the fact that Darwin's sigaltstack man page says it ignores the size
		// when SS_DISABLE is set, it doesn't. sigaltstack returns ENOMEM

be preempted, that must not grow the user stack, or that switch user
goroutines. Code running on the system stack is implicitly
non-preemptible and the garbage collector does not scan system stacks.
While running on the system stack, the current user stack is not used
for execution.

nosplit functions
-----------------

Most functions start with a prologue that inspects the stack pointer
and the current G's stack bound and calls `morestack` if the stack

//go:nosplit
//go:nowritebarrierrec
func getsig(i uint32) uintptr {
	var sa sigactiont
	sigaction(i, nil, &sa)
	return sa.sa_sigaction
}

// setSignalstackSP sets the ss_sp field of a stackt.
//
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
	s.ss_sp = sp
}

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	*mask |= 1 << (uint32(i) - 1)
}

// alternate signal stack. If the alternate signal stack is not set
// for the thread (the normal case) then set the alternate signal
// stack to the gsignal stack. If the alternate signal stack is set
// for the thread (the case when a non-Go thread sets the alternate
// signal stack and then calls a Go function) then set the gsignal
// stack to the alternate signal stack. We also set the alternate

	logChLock.Unlock()

	newTicker := time.NewTicker(time.Second)
	isTick := false

	for {
		isTick = false
		select {
		case _ = <-newTicker.C:
			isTick = true
		case entry, _ = <-globalBuffer:
		case entry, ok = <-h.logCh:
			if !ok {
				return
			}
		case <-ctx.Done():
			return
		}

		if !isTick {
			atomic.AddInt64(&h.totalMessages, 1)

			if !isDirQueue {

	which goroutines were created, where N limits the number of ancestor goroutines to
	report. This also extends the information returned by runtime.Stack.
	Setting N to 0 will report no ancestry information.

	tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
	use the runtime's default stack unwinder instead of frame pointer unwinding.

	EvGoSleep           event.Type = 19 // goroutine calls Sleep [timestamp, stack]
	EvGoBlock           event.Type = 20 // goroutine blocks [timestamp, stack]
	EvGoUnblock         event.Type = 21 // goroutine is unblocked [timestamp, goroutine id, seq, stack]
	EvGoBlockSend       event.Type = 22 // goroutine blocks on chan send [timestamp, stack]
	EvGoBlockRecv       event.Type = 23 // goroutine blocks on chan recv [timestamp, stack]

	EVFILT_WRITE = C.EVFILT_WRITE
	EVFILT_USER  = C.EVFILT_USER

	NOTE_TRIGGER = C.NOTE_TRIGGER
)

type Rtprio C.struct_rtprio
type Lwpparams C.struct_lwp_params
type Sigset C.struct___sigset
type StackT C.stack_t

type Siginfo C.siginfo_t

type Mcontext C.mcontext_t
type Ucontext C.ucontext_t

type Timespec C.struct_timespec
type Timeval C.struct_timeval
type Itimerval C.struct_itimerval

	KeepAlive(new)
	KeepAlive(old)
}
func sigprocmask_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func sigaltstack(new *stackt, old *stackt) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(sigaltstack_trampoline)), unsafe.Pointer(&new))
	KeepAlive(new)
	KeepAlive(old)
}
func sigaltstack_trampoline()

// Not used on OpenBSD, but must be defined.

	case "", config.EnableOn:
		cfg.IdleMode = 0
	case config.EnableOff:
		cfg.IdleMode = 1
	default:
		return cfg, fmt.Errorf("unknown value: '%s'", idleSpeed)
	}

	// Stick to loading deprecated config/env if they are already set, and the Speed value
	// has not been changed from its "default" value, if it has been changed honor new settings.
	if kvs.GetWithDefault(Speed, DefaultKVS) == "default" {