sema  uint32
}

// A Locker represents an object that can be locked and unlocked.
type Locker interface {
	Lock()
	Unlock()
}

const (
	mutexLocked = 1 << iota // mutex is locked
	mutexWoken
	mutexStarving
	mutexWaiterShift = iota

	// Mutex fairness.
	//
	// Mutex can be in 2 modes of operations: normal and starvation.
	// In normal mode waiters are queued in FIFO order, but a woken up waiter

	stdZeroSecond                                  // "05"
	stdLongYear              = iota + stdNeedDate  // "2006"
	stdYear                                        // "06"
	stdPM                    = iota + stdNeedClock // "PM"
	stdpm                                          // "pm"
	stdTZ                    = iota                // "MST"
	stdISO8601TZ                                   // "Z0700"  // prints Z for UTC

	fin     [(_FinBlockSize - 2*goarch.PtrSize - 2*4) / unsafe.Sizeof(finalizer{})]finalizer
}

var fingStatus atomic.Uint32

// finalizer goroutine status.
const (
	fingUninitialized uint32 = iota
	fingCreated       uint32 = 1 << (iota - 1)
	fingRunningFinalizer
	fingWait
	fingWake
)

var finlock mutex  // protects the following variables
var fing *g        // goroutine that runs finalizers

	//
	// This may be due to the host not supporting handles, or because
	// Process was created as a literal, leaving handle unset.
	//
	// This must be the zero value so Process literals get modePID.
	modePID processMode = iota

	// modeHandle means that Process operations use handle, which is
	// initialized with an OS process handle.
	//
	// Note that Release and Wait will deactivate and eventually close the

type unifyMode uint

const (
	// If assign is set, we are unifying types involved in an assignment:
	// they may match inexactly at the top, but element types must match
	// exactly.
	assign unifyMode = 1 << iota

	// If exact is set, types unify if they are identical (or can be
	// made identical with suitable arguments for type parameters).
	// Otherwise, a named type and a type literal unify if their

type unifyMode uint

const (
	// If assign is set, we are unifying types involved in an assignment:
	// they may match inexactly at the top, but element types must match
	// exactly.
	assign unifyMode = 1 << iota

	// If exact is set, types unify if they are identical (or can be
	// made identical with suitable arguments for type parameters).
	// Otherwise, a named type and a type literal unify if their

	// a go.mod file in the current directory or any parent. If none is found,
	// modules may be disabled (GO111MODULE=auto) or commands may run in a
	// limited module mode.
	AutoRoot Root = iota

	// NoRoot is used for commands that run in module mode and ignore any go.mod
	// file the current directory or in parent directories.
	NoRoot

const (
	zero form = iota
	finite
	inf
)

// RoundingMode determines how a [Float] value is rounded to the
// desired precision. Rounding may change the [Float] value; the
// rounding error is described by the [Float]'s [Accuracy].
type RoundingMode byte

// These constants define supported rounding modes.
const (
	ToNearestEven RoundingMode = iota // == IEEE 754-2008 roundTiesToEven

	// lookup per module, and we don't want to load information that's neither
	// relevant nor actionable.
	type modFlags int
	const (
		resolved modFlags = 1 << iota // version resolved by 'go get'
		named                         // explicitly named on command line or provides a named package
		hasPkg                        // needed to build named packages

//	varkill - killed by the instruction (set)
//
// A kill happens after the use (for an instruction that updates a value, for example).
type liveEffect int

const (
	uevar liveEffect = 1 << iota
	varkill
)

// valueEffects returns the index of a variable in lv.vars and the
// liveness effects v has on that variable.
// If v does not affect any tracked variables, it returns -1, 0.