99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build js && wasm
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package poll
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import (
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"syscall"
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"time"
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)
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type pollDesc struct {
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fd *FD
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closing bool
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}
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func (pd *pollDesc) init(fd *FD) error { pd.fd = fd; return nil }
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func (pd *pollDesc) close() {}
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func (pd *pollDesc) evict() {
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pd.closing = true
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if pd.fd != nil {
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syscall.StopIO(pd.fd.Sysfd)
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}
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}
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func (pd *pollDesc) prepare(mode int, isFile bool) error {
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if pd.closing {
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return errClosing(isFile)
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}
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return nil
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}
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func (pd *pollDesc) prepareRead(isFile bool) error { return pd.prepare('r', isFile) }
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func (pd *pollDesc) prepareWrite(isFile bool) error { return pd.prepare('w', isFile) }
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func (pd *pollDesc) wait(mode int, isFile bool) error {
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if pd.closing {
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return errClosing(isFile)
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}
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if isFile { // TODO(neelance): wasm: Use callbacks from JS to block until the read/write finished.
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return nil
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}
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return ErrDeadlineExceeded
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}
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func (pd *pollDesc) waitRead(isFile bool) error { return pd.wait('r', isFile) }
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func (pd *pollDesc) waitWrite(isFile bool) error { return pd.wait('w', isFile) }
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func (pd *pollDesc) waitCanceled(mode int) {}
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func (pd *pollDesc) pollable() bool { return true }
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// SetDeadline sets the read and write deadlines associated with fd.
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func (fd *FD) SetDeadline(t time.Time) error {
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return setDeadlineImpl(fd, t, 'r'+'w')
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}
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// SetReadDeadline sets the read deadline associated with fd.
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func (fd *FD) SetReadDeadline(t time.Time) error {
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return setDeadlineImpl(fd, t, 'r')
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}
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// SetWriteDeadline sets the write deadline associated with fd.
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func (fd *FD) SetWriteDeadline(t time.Time) error {
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return setDeadlineImpl(fd, t, 'w')
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}
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func setDeadlineImpl(fd *FD, t time.Time, mode int) error {
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d := t.UnixNano()
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if t.IsZero() {
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d = 0
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}
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if err := fd.incref(); err != nil {
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return err
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}
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switch mode {
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case 'r':
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syscall.SetReadDeadline(fd.Sysfd, d)
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case 'w':
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syscall.SetWriteDeadline(fd.Sysfd, d)
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case 'r' + 'w':
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syscall.SetReadDeadline(fd.Sysfd, d)
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syscall.SetWriteDeadline(fd.Sysfd, d)
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}
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fd.decref()
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return nil
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}
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// IsPollDescriptor reports whether fd is the descriptor being used by the poller.
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// This is only used for testing.
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func IsPollDescriptor(fd uintptr) bool {
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return false
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}
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