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