forked from github/multus-cni
Revert vendor directory to support old golang (GOPATH mode)
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
This commit is contained in:
Tomofumi Hayashi
committed by
Tomofumi Hayashi
Tomofumi Hayashi
parent
de1c1c78e9
commit
ac21a96804
310
vendor/github.com/Microsoft/go-winio/file.go
generated
vendored
Normal file
310
vendor/github.com/Microsoft/go-winio/file.go
generated
vendored
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@@ -0,0 +1,310 @@
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// +build windows
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package winio
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import (
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"errors"
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"io"
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"runtime"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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)
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//sys cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) = CancelIoEx
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//sys createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintptr, threadCount uint32) (newport syscall.Handle, err error) = CreateIoCompletionPort
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//sys getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) = GetQueuedCompletionStatus
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//sys setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err error) = SetFileCompletionNotificationModes
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//sys timeBeginPeriod(period uint32) (n int32) = winmm.timeBeginPeriod
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type atomicBool int32
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func (b *atomicBool) isSet() bool { return atomic.LoadInt32((*int32)(b)) != 0 }
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func (b *atomicBool) setFalse() { atomic.StoreInt32((*int32)(b), 0) }
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func (b *atomicBool) setTrue() { atomic.StoreInt32((*int32)(b), 1) }
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func (b *atomicBool) swap(new bool) bool {
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var newInt int32
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if new {
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newInt = 1
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}
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return atomic.SwapInt32((*int32)(b), newInt) == 1
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}
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const (
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cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS = 1
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cFILE_SKIP_SET_EVENT_ON_HANDLE = 2
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)
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var (
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ErrFileClosed = errors.New("file has already been closed")
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ErrTimeout = &timeoutError{}
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)
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type timeoutError struct{}
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func (e *timeoutError) Error() string { return "i/o timeout" }
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func (e *timeoutError) Timeout() bool { return true }
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func (e *timeoutError) Temporary() bool { return true }
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type timeoutChan chan struct{}
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var ioInitOnce sync.Once
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var ioCompletionPort syscall.Handle
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// ioResult contains the result of an asynchronous IO operation
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type ioResult struct {
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bytes uint32
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err error
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}
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// ioOperation represents an outstanding asynchronous Win32 IO
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type ioOperation struct {
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o syscall.Overlapped
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ch chan ioResult
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}
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func initIo() {
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h, err := createIoCompletionPort(syscall.InvalidHandle, 0, 0, 0xffffffff)
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if err != nil {
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panic(err)
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}
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ioCompletionPort = h
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go ioCompletionProcessor(h)
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}
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// win32File implements Reader, Writer, and Closer on a Win32 handle without blocking in a syscall.
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// It takes ownership of this handle and will close it if it is garbage collected.
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type win32File struct {
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handle syscall.Handle
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wg sync.WaitGroup
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wgLock sync.RWMutex
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closing atomicBool
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readDeadline deadlineHandler
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writeDeadline deadlineHandler
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}
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type deadlineHandler struct {
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setLock sync.Mutex
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channel timeoutChan
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channelLock sync.RWMutex
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timer *time.Timer
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timedout atomicBool
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}
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// makeWin32File makes a new win32File from an existing file handle
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func makeWin32File(h syscall.Handle) (*win32File, error) {
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f := &win32File{handle: h}
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ioInitOnce.Do(initIo)
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_, err := createIoCompletionPort(h, ioCompletionPort, 0, 0xffffffff)
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if err != nil {
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return nil, err
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}
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err = setFileCompletionNotificationModes(h, cFILE_SKIP_COMPLETION_PORT_ON_SUCCESS|cFILE_SKIP_SET_EVENT_ON_HANDLE)
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if err != nil {
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return nil, err
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}
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f.readDeadline.channel = make(timeoutChan)
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f.writeDeadline.channel = make(timeoutChan)
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return f, nil
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}
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func MakeOpenFile(h syscall.Handle) (io.ReadWriteCloser, error) {
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return makeWin32File(h)
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}
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// closeHandle closes the resources associated with a Win32 handle
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func (f *win32File) closeHandle() {
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f.wgLock.Lock()
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// Atomically set that we are closing, releasing the resources only once.
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if !f.closing.swap(true) {
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f.wgLock.Unlock()
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// cancel all IO and wait for it to complete
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cancelIoEx(f.handle, nil)
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f.wg.Wait()
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// at this point, no new IO can start
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syscall.Close(f.handle)
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f.handle = 0
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} else {
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f.wgLock.Unlock()
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}
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}
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// Close closes a win32File.
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func (f *win32File) Close() error {
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f.closeHandle()
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return nil
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}
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// prepareIo prepares for a new IO operation.
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// The caller must call f.wg.Done() when the IO is finished, prior to Close() returning.
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func (f *win32File) prepareIo() (*ioOperation, error) {
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f.wgLock.RLock()
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if f.closing.isSet() {
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f.wgLock.RUnlock()
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return nil, ErrFileClosed
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}
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f.wg.Add(1)
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f.wgLock.RUnlock()
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c := &ioOperation{}
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c.ch = make(chan ioResult)
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return c, nil
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}
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// ioCompletionProcessor processes completed async IOs forever
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func ioCompletionProcessor(h syscall.Handle) {
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// Set the timer resolution to 1. This fixes a performance regression in golang 1.6.
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timeBeginPeriod(1)
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for {
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var bytes uint32
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var key uintptr
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var op *ioOperation
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err := getQueuedCompletionStatus(h, &bytes, &key, &op, syscall.INFINITE)
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if op == nil {
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panic(err)
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}
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op.ch <- ioResult{bytes, err}
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}
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}
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// asyncIo processes the return value from ReadFile or WriteFile, blocking until
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// the operation has actually completed.
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func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err error) (int, error) {
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if err != syscall.ERROR_IO_PENDING {
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return int(bytes), err
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}
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if f.closing.isSet() {
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cancelIoEx(f.handle, &c.o)
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}
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var timeout timeoutChan
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if d != nil {
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d.channelLock.Lock()
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timeout = d.channel
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d.channelLock.Unlock()
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}
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var r ioResult
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select {
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case r = <-c.ch:
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err = r.err
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if err == syscall.ERROR_OPERATION_ABORTED {
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if f.closing.isSet() {
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err = ErrFileClosed
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}
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}
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case <-timeout:
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cancelIoEx(f.handle, &c.o)
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r = <-c.ch
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err = r.err
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if err == syscall.ERROR_OPERATION_ABORTED {
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err = ErrTimeout
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}
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}
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// runtime.KeepAlive is needed, as c is passed via native
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// code to ioCompletionProcessor, c must remain alive
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// until the channel read is complete.
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runtime.KeepAlive(c)
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return int(r.bytes), err
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}
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// Read reads from a file handle.
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func (f *win32File) Read(b []byte) (int, error) {
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c, err := f.prepareIo()
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if err != nil {
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return 0, err
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}
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defer f.wg.Done()
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if f.readDeadline.timedout.isSet() {
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return 0, ErrTimeout
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}
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var bytes uint32
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err = syscall.ReadFile(f.handle, b, &bytes, &c.o)
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n, err := f.asyncIo(c, &f.readDeadline, bytes, err)
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runtime.KeepAlive(b)
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// Handle EOF conditions.
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if err == nil && n == 0 && len(b) != 0 {
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return 0, io.EOF
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} else if err == syscall.ERROR_BROKEN_PIPE {
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return 0, io.EOF
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} else {
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return n, err
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}
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}
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// Write writes to a file handle.
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func (f *win32File) Write(b []byte) (int, error) {
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c, err := f.prepareIo()
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if err != nil {
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return 0, err
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}
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defer f.wg.Done()
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if f.writeDeadline.timedout.isSet() {
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return 0, ErrTimeout
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}
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var bytes uint32
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err = syscall.WriteFile(f.handle, b, &bytes, &c.o)
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n, err := f.asyncIo(c, &f.writeDeadline, bytes, err)
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runtime.KeepAlive(b)
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return n, err
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}
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func (f *win32File) SetReadDeadline(deadline time.Time) error {
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return f.readDeadline.set(deadline)
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}
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func (f *win32File) SetWriteDeadline(deadline time.Time) error {
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return f.writeDeadline.set(deadline)
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}
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func (f *win32File) Flush() error {
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return syscall.FlushFileBuffers(f.handle)
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}
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func (d *deadlineHandler) set(deadline time.Time) error {
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d.setLock.Lock()
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defer d.setLock.Unlock()
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if d.timer != nil {
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if !d.timer.Stop() {
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<-d.channel
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}
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d.timer = nil
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}
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d.timedout.setFalse()
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select {
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case <-d.channel:
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d.channelLock.Lock()
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d.channel = make(chan struct{})
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d.channelLock.Unlock()
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default:
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}
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if deadline.IsZero() {
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return nil
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}
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timeoutIO := func() {
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d.timedout.setTrue()
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close(d.channel)
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}
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now := time.Now()
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duration := deadline.Sub(now)
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if deadline.After(now) {
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// Deadline is in the future, set a timer to wait
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d.timer = time.AfterFunc(duration, timeoutIO)
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} else {
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// Deadline is in the past. Cancel all pending IO now.
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timeoutIO()
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}
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return nil
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}
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