// license that can be found in the LICENSE file.

//go:build !unix && !windows

package filelock

import (
	"errors"
	"io/fs"
)

type lockType int8

const (
	readLock = iota + 1
	writeLock
)

func lock(f File, lt lockType) error {
	return &fs.PathError{
		Op:   lt.String(),
		Path: f.Name(),
		Err:  errors.ErrUnsupported,
	}
}

func unlock(f File) error {

	BO_NOTBCR  = 4  // branch on not cr value
)

// Bit settings from the CR

const (
	C_COND_LT = iota // 0 result is negative
	C_COND_GT        // 1 result is positive
	C_COND_EQ        // 2 result is zero
	C_COND_SO        // 3 summary overflow or FP compare w/ NaN
)

const (
	C_NONE     = iota
	C_REGP     /* An even numbered gpr which can be used a gpr pair argument */
	C_REG      /* Any gpr register */

	return float64(t) / float64(time.Microsecond)
}

type GState int

const (
	GDead GState = iota
	GRunnable
	GRunning
	GWaiting
	GWaitingGC

	gStateCount
)

type ThreadState int

const (
	ThreadStateInSyscall ThreadState = iota
	ThreadStateInSyscallRuntime
	ThreadStateRunning

	threadStateCount
)

type frameNode struct {
	id       int

	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

package syntax

import (
	"fmt"
	"io"
	"os"
)

// Mode describes the parser mode.
type Mode uint

// Modes supported by the parser.
const (
	CheckBranches Mode = 1 << iota // check correct use of labels, break, continue, and goto statements
)

// Error describes a syntax error. Error implements the error interface.
type Error struct {
	Pos Pos
	Msg string
}

// with merging of counter data for a given function.

import (
	"fmt"
	"internal/coverage"
	"math"
)

type ModeMergePolicy uint8

const (
	ModeMergeStrict ModeMergePolicy = iota
	ModeMergeRelaxed
)

// Merger provides state and methods to help manage the process of
// merging together coverage counter data for a given function, for

	// Examples of TopFrame functions include goexit, which appears
	// at the top of a user goroutine stack, and mstart, which appears
	// at the top of a system goroutine stack.
	FuncFlagTopFrame FuncFlag = 1 << iota

	// FuncFlagSPWrite indicates a function that writes an arbitrary value to SP
	// (any write other than adding or subtracting a constant amount).
	// The traceback routines cannot encode such changes into the

)

// Experiments.
const (
	// AllocFree is the alloc-free events experiment.
	AllocFree event.Experiment = 1 + iota
)

// Experimental events.
const (
	_ event.Type = 127 + iota

	// Experimental events for AllocFree.

	// Experimental heap span events. Added in Go 1.23.
	EvSpan      // heap span exists [timestamp, id, npages, type/class]

type ScanToken rune

const (
	// Asm defines some two-character lexemes. We make up
	// a rune/ScanToken value for them - ugly but simple.
	LSH          ScanToken = -1000 - iota // << Left shift.
	RSH                                   // >> Logical right shift.
	ARR                                   // -> Used on ARM for shift type 3, arithmetic right shift.

//
// TODO(rsc): Give idiomatic Go names.
//
//go:generate stringer -type=SymKind
const (
	// An otherwise invalid zero value for the type
	Sxxx SymKind = iota
	// Executable instructions
	STEXT
	// Read only static data
	SRODATA
	// Static data that does not contain any pointers
	SNOPTRDATA
	// Static data
	SDATA
	// Statically data that is initially all 0s
	SBSS