// doesn't fault. See issue 60825.

	// Mmap two pages of memory, and make the second page inaccessible,
	// so we have an address at the end of a page.
	pagesize := syscall.Getpagesize()
	b, err := syscall.Mmap(0, 0, 2*pagesize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("mmap failed %s", err)
	}
	defer syscall.Munmap(b)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

// Export guts for testing.

package runtime

var Mmap = mmap
var Munmap = munmap

const ENOMEM = _ENOMEM
const MAP_ANON = _MAP_ANON
const MAP_PRIVATE = _MAP_PRIVATE
const MAP_FIXED = _MAP_FIXED

func GetPhysPageSize() uintptr {
	return physPageSize

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (js && wasm) || wasip1 || plan9 || (solaris && !go1.20)

package mmap

import (
	"io"
	"os"
)

// mmapFile on other systems doesn't mmap the file. It just reads everything.
func mmapFile(f *os.File, _ *Data) (Data, error) {
	b, err := io.ReadAll(f)
	if err != nil {
		return Data{}, err
	}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build (js && wasm) || wasip1 || plan9

package mmap

import (
	"io"
	"os"
)

// mmapFile on other systems doesn't mmap the file. It just reads everything.
func mmapFile(f *os.File) (Data, error) {
	b, err := io.ReadAll(f)
	if err != nil {
		return Data{}, err
	}
	return Data{f, b}, nil

//go:build unix

package syscall

import _ "unsafe" // for linkname

// mmap should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - modernc.org/memory
//   - github.com/ncruces/go-sqlite3
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//

)

// Test that race detector does not crash when accessing non-Go allocated memory (issue 9136).
func TestNonGoMemory(t *testing.T) {
	data, err := syscall.Mmap(-1, 0, 4096, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("failed to mmap memory: %v", err)
	}
	defer syscall.Munmap(data)
	p := (*uint32)(unsafe.Pointer(&data[0]))
	atomic.AddUint32(p, 1)
	(*p)++
	if *p != 2 {

// Package orderedmap provides an ordered map, implemented as a binary tree.
package main

import (
	"bytes"
	"context"
	"fmt"
	"runtime"
)

type Ordered interface {
	~int | ~int8 | ~int16 | ~int32 | ~int64 |
		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
		~float32 | ~float64 |
		~string
}

// _Map is an ordered map.
type _Map[K, V any] struct {
	root    *node[K, V]

//go:build unix

package syscall_test

import (
	"syscall"
	"testing"
)

func TestMmap(t *testing.T) {
	b, err := syscall.Mmap(-1, 0, syscall.Getpagesize(), syscall.PROT_NONE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("Mmap: %v", err)
	}
	if err := syscall.Munmap(b); err != nil {
		t.Fatalf("Munmap: %v", err)
	}

func printnl()

//go:noescape
func useT40(*T40)

type T40 struct {
	m map[int]int
}

func newT40() *T40 {
	ret := T40{}
	ret.m = make(map[int]int, 42) // ERROR "live at call to makemap: &ret$"
	return &ret
}

func bad40() {
	t := newT40() // ERROR "stack object ret T40$" "stack object .autotmp_[0-9]+ runtime.hmap$"
	printnl()     // ERROR "live at call to printnl: ret$"
	useT40(t)
}

func TestMap() {
	s1 := []int{1, 2, 3}
	s2 := _Map(s1, func(i int) float64 { return float64(i) * 2.5 })
	if want := []float64{2.5, 5, 7.5}; !_Equal(s2, want) {
		panic(fmt.Sprintf("_Map(%v, ...) = %v, want %v", s1, s2, want))
	}

	s3 := []string{"Hello", "World"}
	s4 := _Map(s3, strings.ToLower)
	if want := []string{"hello", "world"}; !_Equal(s4, want) {
		panic(fmt.Sprintf("_Map(%v, strings.ToLower) = %v, want %v", s3, s4, want))
	}