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How to use sharedArray method of data Package

Best K6 code snippet using data.sharedArray

shared_array.go

Source:shared_array.go

1// Copyright 2016 Aleksandr Demakin. All rights reserved.2package array3import (4	"math"5	"unsafe"6	"github.com/nxgtw/go-ipc/internal/allocator"7)8const (9	indexEntrySize = unsafe.Sizeof(indexEntry{})10)11type indexEntry struct {12	len     int3213	slotIdx int3214}15type index struct {16	entries []indexEntry17	bitmap  []uint6418	headIdx *int3219}20func bitmapSize(sz int) int {21	bitmapSize := sz / 6422	if sz%64 != 0 {23		bitmapSize++24	}25	return bitmapSize26}27func indexSize(len int) int {28	// len of index, len of bitmap, current head index.29	return len*int(indexEntrySize) + bitmapSize(len)*8 + 430}31func newIndex(raw unsafe.Pointer, sz int) index {32	bitmapSz := bitmapSize(sz)33	rawIndexSlice := allocator.RawSliceFromUnsafePointer(raw, sz, sz)34	raw = allocator.AdvancePointer(raw, uintptr(sz)*indexEntrySize)35	rawBitmapSlize := allocator.RawSliceFromUnsafePointer(raw, bitmapSz, bitmapSz)36	raw = allocator.AdvancePointer(raw, 8*uintptr(bitmapSz))37	return index{38		entries: *(*[]indexEntry)(rawIndexSlice),39		bitmap:  *(*[]uint64)(rawBitmapSlize),40		headIdx: (*int32)(raw),41	}42}43func lowestZeroBit(value uint64) uint8 {44	for bitIdx := uint8(0); bitIdx < 64; bitIdx++ {45		if value&1 == 0 {46			return bitIdx47		}48		value >>= 149	}50	return math.MaxUint851}52func (idx *index) reserveFreeSlot(at int) int32 {53	for i, b := range idx.bitmap {54		if b != math.MaxUint64 {55			bitIdx := lowestZeroBit(b)56			idx.bitmap[i] |= (1 << bitIdx)57			return int32(i*64 + int(bitIdx))58		}59	}60	panic("no free slots")61}62func (idx index) freeSlot(at int) {63	slotIdx := idx.entries[at].slotIdx64	bucketIdx, bitIdx := slotIdx/64, slotIdx%6465	idx.bitmap[bucketIdx] &= ^(1 << uint32(bitIdx))66}67// SharedArray is an array placed in the shared memory with fixed length and element size.68// It is possible to swap elements and pop them from any position. It never moves elements69// in memory, so can be used to implement an array of futexes or spin locks.70type SharedArray struct {71	data *mappedArray72	idx  index73}74// NewSharedArray initializes new shared array with size and element size.75func NewSharedArray(raw unsafe.Pointer, size, elemSize int) *SharedArray {76	data := newMappedArray(raw)77	data.init(size, elemSize)78	idx := newIndex(allocator.AdvancePointer(raw, mappedArrayHdrSize+uintptr(size*elemSize)), size)79	return &SharedArray{80		data: data,81		idx:  idx,82	}83}84// OpenSharedArray opens existing shared array.85func OpenSharedArray(raw unsafe.Pointer) *SharedArray {86	data := newMappedArray(raw)87	idx := newIndex(allocator.AdvancePointer(raw, mappedArrayHdrSize+uintptr(data.cap()*data.elemLen())), data.cap())88	return &SharedArray{89		data: data,90		idx:  idx,91	}92}93// Cap returns array's cpacity94func (arr *SharedArray) Cap() int {95	return arr.data.cap()96}97// Len returns current length.98func (arr *SharedArray) Len() int {99	return arr.data.len()100}101// SafeLen atomically loads returns current length.102func (arr *SharedArray) SafeLen() int {103	return arr.data.safeLen()104}105// ElemSize returns size of the element.106func (arr *SharedArray) ElemSize() int {107	return arr.data.elemLen()108}109// PushBack add new element to the end of the array, merging given datas.110// Returns number of bytes copied, less or equal, than the size of the element.111func (arr *SharedArray) PushBack(datas ...[]byte) int {112	curLen := arr.Len()113	if curLen >= arr.Cap() {114		panic("index out of range")115	}116	physIdx := arr.logicalIdxToPhys(curLen)117	entry := indexEntry{118		slotIdx: arr.idx.reserveFreeSlot(physIdx),119		len:     0,120	}121	slData := arr.data.at(int(entry.slotIdx))122	for _, data := range datas {123		entry.len += int32(copy(slData[entry.len:], data))124		if int(entry.len) < len(data) {125			break126		}127	}128	arr.idx.entries[physIdx] = entry129	arr.data.incLen()130	return int(entry.len)131}132// At returns data at the position i. Returned slice references to the data in the array.133// It does not perform border check.134func (arr *SharedArray) At(i int) []byte {135	entry := arr.entryAt(i)136	return arr.data.at(int(entry.slotIdx))[:int(entry.len)]137}138// AtPointer returns pointer to the data at the position i.139// It does not perform border check.140func (arr *SharedArray) AtPointer(i int) unsafe.Pointer {141	entry := arr.entryAt(i)142	return arr.data.atPointer(int(entry.slotIdx))143}144// PopFront removes the first element of the array.145func (arr *SharedArray) PopFront() {146	curLen := arr.Len()147	if curLen == 0 {148		panic("index out of range")149	}150	arr.idx.freeSlot(int(*arr.idx.headIdx))151	arr.forwardHead()152	arr.data.decLen()153}154// PopBack removes the last element of the array.155func (arr *SharedArray) PopBack() {156	curLen := arr.Len()157	if curLen == 0 {158		panic("index out of range")159	}160	arr.idx.freeSlot(arr.logicalIdxToPhys(curLen - 1))161	if curLen == 1 {162		*arr.idx.headIdx = 0163	}164	arr.data.decLen()165}166// RemoveAt removes i'th element.167func (arr *SharedArray) RemoveAt(i int) {168	curLen := arr.Len()169	if i < 0 || i >= curLen {170		panic("index out of range")171	}172	arr.idx.freeSlot(arr.logicalIdxToPhys(i))173	if i <= curLen/2 {174		for j := i; j > 0; j-- {175			arr.idx.entries[arr.logicalIdxToPhys(j)] = arr.idx.entries[arr.logicalIdxToPhys(j-1)]176		}177		arr.forwardHead()178	} else {179		for j := i; j < curLen-1; j++ {180			arr.idx.entries[arr.logicalIdxToPhys(j)] = arr.idx.entries[arr.logicalIdxToPhys(j+1)]181		}182		if curLen == 1 {183			*arr.idx.headIdx = 0184		}185	}186	arr.data.decLen()187}188// Swap swaps two elements of the array.189func (arr *SharedArray) Swap(i, j int) {190	l := arr.Len()191	if i >= l || j >= l {192		panic("index out of range")193	}194	if i == j {195		return196	}197	i, j = arr.logicalIdxToPhys(i), arr.logicalIdxToPhys(j)198	arr.idx.entries[i], arr.idx.entries[j] = arr.idx.entries[j], arr.idx.entries[i]199}200func (arr *SharedArray) forwardHead() {201	if arr.Len() == 1 {202		*arr.idx.headIdx = 0203	} else {204		*arr.idx.headIdx = (*arr.idx.headIdx + 1) % int32(arr.Cap())205	}206}207func (arr *SharedArray) logicalIdxToPhys(log int) int {208	return (log + int(*arr.idx.headIdx)) % arr.Cap()209}210func (arr *SharedArray) entryAt(log int) indexEntry {211	return arr.idx.entries[arr.logicalIdxToPhys(log)]212}213// CalcSharedArraySize returns the size, needed to place shared array in memory.214func CalcSharedArraySize(size, elemSize int) int {215	return int(mappedArrayHdrSize) + // mq header216		indexSize(size) + // mq index217		size*elemSize // mq messages size218}...

data.go

Source:data.go

...29type (30	// RootModule is the global module instance that will create module31	// instances for each VU.32	RootModule struct {33		shared sharedArrays34	}35	// Data represents an instance of the data module.36	Data struct {37		vu     modules.VU38		shared *sharedArrays39	}40	sharedArrays struct {41		data map[string]sharedArray42		mu   sync.RWMutex43	}44)45var (46	_ modules.Module   = &RootModule{}47	_ modules.Instance = &Data{}48)49// New returns a pointer to a new RootModule instance.50func New() *RootModule {51	return &RootModule{52		shared: sharedArrays{53			data: make(map[string]sharedArray),54		},55	}56}57// NewModuleInstance implements the modules.Module interface to return58// a new instance for each VU.59func (rm *RootModule) NewModuleInstance(vu modules.VU) modules.Instance {60	return &Data{61		vu:     vu,62		shared: &rm.shared,63	}64}65// Exports returns the exports of the data module.66func (d *Data) Exports() modules.Exports {67	return modules.Exports{68		Named: map[string]interface{}{69			"SharedArray": d.sharedArray,70		},71	}72}73// sharedArray is a constructor returning a shareable read-only array74// indentified by the name and having their contents be whatever the call returns75func (d *Data) sharedArray(call goja.ConstructorCall) *goja.Object {76	rt := d.vu.Runtime()77	if d.vu.State() != nil {78		common.Throw(rt, errors.New("new SharedArray must be called in the init context"))79	}80	name := call.Argument(0).String()81	if name == "" {82		common.Throw(rt, errors.New("empty name provided to SharedArray's constructor"))83	}84	fn, ok := goja.AssertFunction(call.Argument(1))85	if !ok {86		common.Throw(rt, errors.New("a function is expected as the second argument of SharedArray's constructor"))87	}88	array := d.shared.get(rt, name, fn)89	return array.wrap(rt).ToObject(rt)90}91func (s *sharedArrays) get(rt *goja.Runtime, name string, call goja.Callable) sharedArray {92	s.mu.RLock()93	array, ok := s.data[name]94	s.mu.RUnlock()95	if !ok {96		s.mu.Lock()97		defer s.mu.Unlock()98		array, ok = s.data[name]99		if !ok {100			array = getShareArrayFromCall(rt, call)101			s.data[name] = array102		}103	}104	return array105}106func getShareArrayFromCall(rt *goja.Runtime, call goja.Callable) sharedArray {107	gojaValue, err := call(goja.Undefined())108	if err != nil {109		common.Throw(rt, err)110	}111	obj := gojaValue.ToObject(rt)112	if obj.ClassName() != "Array" {113		common.Throw(rt, errors.New("only arrays can be made into SharedArray")) // TODO better error114	}115	arr := make([]string, obj.Get("length").ToInteger())116	stringify, _ := goja.AssertFunction(rt.GlobalObject().Get("JSON").ToObject(rt).Get("stringify"))117	var val goja.Value118	for i := range arr {119		val, err = stringify(goja.Undefined(), obj.Get(strconv.Itoa(i)))120		if err != nil {121			panic(err)122		}123		arr[i] = val.String()124	}125	return sharedArray{arr: arr}126}...

sharedArray

Using AI Code Generation

1import "data"2func main() {3}4import "data"5func main() {6}7import "data"8func main() {9}10import "data"11func main() {12}13import "data"14func main() {15}16import "data"17func main() {18}19import "data"20func main() {21}22import "data"23func main() {24}25import "data"26func main() {27}28import "data"29func main() {30}31import "data"32func main() {33}34import "data"35func main() {36}37import "data"38func main() {39}40import "data"

sharedArray

Using AI Code Generation

1import (2func main() {3    data := Data{}4    data.sharedArray = []int{1,2,3}5    fmt.Println(data.sharedArray)6}7import (8func main() {9    data := Data{}10    data.sharedArray = []int{4,5,6}11    fmt.Println(data.sharedArray)12}13import (14func main() {15    data := Data{}16    data.sharedArray = []int{7,8,9}17    fmt.Println(data.sharedArray)18}19import (20func main() {21    data := Data{}22    data.sharedArray = []int{10,11,12}23    fmt.Println(data.sharedArray)24}25import (26func main() {27    data := Data{}28    data.sharedArray = []int{13,14,15}29    fmt.Println(data.sharedArray)30}31import (32func main() {33    data := Data{}34    data.sharedArray = []int{16,17,18}35    fmt.Println(data.sharedArray)36}37import (38func main() {39    data := Data{}40    data.sharedArray = []int{19,20,21}41    fmt.Println(data.sharedArray)42}43import (44func main() {45    data := Data{}46    data.sharedArray = []int{22,23,24}47    fmt.Println(data.sharedArray)48}49import (50func main() {51    data := Data{}

sharedArray

Using AI Code Generation

1import (2func main() {3    fmt.Println(data.SharedArray())4}5import (6func main() {7    fmt.Println(data.SharedMap())8}9import (10func main() {11    fmt.Println(data.SharedStruct())12}13import (14func main() {15    fmt.Println(data.SharedFunc())16}17import (18func main() {19    fmt.Println(data.SharedConst())20}21import (22func main() {23    fmt.Println(data.SharedVar())24}25import (26func main() {27    fmt.Println(data.SharedInterface())28}29import (30func main() {31    fmt.Println(data.SharedType())32}33import (34func main() {35    fmt.Println(data.SharedChan())36}37import (38func main() {39    fmt.Println(data.SharedMapChan())40}

sharedArray

Using AI Code Generation

1import (2func main() {3	sharedArray.Data.Add("Hello", 0)4	sharedArray.Data.Add("World", 1)5	sharedArray.Data.Add("!", 2)6	fmt.Println(sharedArray.Data.Get(0))7	fmt.Println(sharedArray.Data.Get(1))8	fmt.Println(sharedArray.Data.Get(2))9}10import (11func main() {12	fmt.Println(sharedArray.Data.Get(0))13	fmt.Println(sharedArray.Data.Get(1))14	fmt.Println(sharedArray.Data.Get(2))15}16I have a sharedArray package that is imported by two files. The Data class in the package has a method to add a string to a slice and a method to get a string from the slice. I want to be able to add strings to the slice in one file and then get them in another file. I am trying to do this with global variables but I'm not sure how to do it. Here is my code:1.go2.go17int main() {18  Game game;19  game.loadTextures();20  game.update();21  game.draw();22  return 0;23}24class Game {25    void loadTextures();26    void update();27    void draw();28    sf::Texture texture;29};30void Game::loadTextures() {31}32void Game::update() {33}34void Game::draw() {35}

sharedArray

Using AI Code Generation

1import (2type data struct {3}4func (d *data) setArray() {5	rand.Seed(time.Now().UnixNano())6	for i := 0; i < 10; i++ {7		d.sharedArray = append(d.sharedArray, rand.Intn(100))8	}9}10func (d *data) getArray() []int {11}12func (d *data) printArray() {13	fmt.Println(d.sharedArray)14}15func main() {16	d := data{}17	d.setArray()18	d.printArray()19	fmt.Println(d.getArray())20}21import (22type data struct {23}24func (d *data) setArray() {25	rand.Seed(time.Now().UnixNano())26	for i := 0; i < 10; i++ {27		d.sharedArray = append(d.sharedArray, rand.Intn(100))28	}29}30func (d *data) getArray() []int {31}32func (d *data) printArray() {33	fmt.Println(d.sharedArray)34}35func main() {36	d := data{}37	d.setArray()38	d.printArray()39	fmt.Println(d.getArray())40}

sharedArray

Using AI Code Generation

1import (2func main() {3	d := data.NewData()4	d.Set(0, 1)5	fmt.Printf("sharedArray[0] is %d6", d.Get(0))7}8import (9func main() {10	d := data.NewData()11	d.Set(0, 1)12	fmt.Printf("sharedArray[0] is %d13", d.Get(0))14}15import (16func main() {17	d := data.NewData()18	d.Set(0, 1)19	fmt.Printf("sharedArray[0] is %d20", d.Get(0))21}22import (23func main() {24	d := data.NewData()25	d.Set(0, 1)26	fmt.Printf("sharedArray[0] is %d27", d.Get(0))28}29import (30func main() {31	d := data.NewData()32	d.Set(0, 1)33	fmt.Printf("sharedArray[0] is %d34", d.Get(0))35}36import (37func main() {38	d := data.NewData()

sharedArray

Using AI Code Generation

1import (2func main() {3    sharedArray := data.NewSharedArray(10)4    data := data.NewData(sharedArray)5    ch := make(chan int)6    go func() {7        for {8            fmt.Println("Reading from shared array: ", sharedArray.Read())9            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)10        }11    }()12    go func() {13        for {14            data.Write(rand.Intn(100))15            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)16        }17    }()18}19import (20func main() {21    sharedArray := data.NewSharedArray(10)22    data := data.NewData(sharedArray)23    ch := make(chan int)24    go func() {25        for {26            fmt.Println("Reading from shared array: ", sharedArray.Read())27            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)28        }29    }()30    go func() {31        for {32            data.Write(rand.Intn(100))33            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)34        }35    }()36}37import (

sharedArray

Using AI Code Generation

1import (2func main() {3	sa = sharedArray.NewSharedArray(5)4	sa.Write(0, 10)5	sa.Write(1, 11)6	sa.Write(2, 12)7	sa.Write(3, 13)8	sa.Write(4, 14)9	fmt.Println(sa.Read(0))10	fmt.Println(sa.Read(1))11	fmt.Println(sa.Read(2))12	fmt.Println(sa.Read(3))13	fmt.Println(sa.Read(4))14}15import (16func main() {17	sa = sharedArray.NewSharedArray(5)18	sa.Write(0, 10)19	sa.Write(1, 11)20	sa.Write(2, 12)21	sa.Write(3, 13)22	sa.Write(4, 14)23	fmt.Println(sa.Read(0))24	fmt.Println(sa.Read(1))25	fmt.Println(sa.Read(2))26	fmt.Println(sa.Read(3))27	fmt.Println(sa.Read(4))28}29import (30func main() {31	sa = sharedArray.NewSharedArray(5)32	sa.Write(0, 10)33	sa.Write(1, 11)34	sa.Write(2, 12)35	sa.Write(3, 13)36	sa.Write(4, 14)37	fmt.Println(sa.Read(0))38	fmt.Println(sa.Read(1))39	fmt.Println(sa.Read(2))40	fmt.Println(sa.Read(3))41	fmt.Println(sa.Read(4))42}

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