145 lines
2.9 KiB
Go
145 lines
2.9 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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// +build darwin dragonfly freebsd linux netbsd openbsd windows solaris
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package net
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import (
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"sync"
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"syscall"
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"time"
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)
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// runtimeNano returns the current value of the runtime clock in nanoseconds.
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func runtimeNano() int64
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func runtime_pollServerInit()
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func runtime_pollOpen(fd uintptr) (uintptr, int)
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func runtime_pollClose(ctx uintptr)
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func runtime_pollWait(ctx uintptr, mode int) int
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func runtime_pollWaitCanceled(ctx uintptr, mode int) int
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func runtime_pollReset(ctx uintptr, mode int) int
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func runtime_pollSetDeadline(ctx uintptr, d int64, mode int)
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func runtime_pollUnblock(ctx uintptr)
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type pollDesc struct {
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runtimeCtx uintptr
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}
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var serverInit sync.Once
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func (pd *pollDesc) Init(fd *netFD) error {
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serverInit.Do(runtime_pollServerInit)
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ctx, errno := runtime_pollOpen(uintptr(fd.sysfd))
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if errno != 0 {
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return syscall.Errno(errno)
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}
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pd.runtimeCtx = ctx
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return nil
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}
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func (pd *pollDesc) Close() {
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if pd.runtimeCtx == 0 {
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return
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}
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runtime_pollClose(pd.runtimeCtx)
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pd.runtimeCtx = 0
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}
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func (pd *pollDesc) Lock() {
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}
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func (pd *pollDesc) Unlock() {
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}
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func (pd *pollDesc) Wakeup() {
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}
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// Evict evicts fd from the pending list, unblocking any I/O running on fd.
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// Return value is whether the pollServer should be woken up.
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func (pd *pollDesc) Evict() bool {
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if pd.runtimeCtx == 0 {
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return false
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}
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runtime_pollUnblock(pd.runtimeCtx)
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return false
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}
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func (pd *pollDesc) Prepare(mode int) error {
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res := runtime_pollReset(pd.runtimeCtx, mode)
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return convertErr(res)
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}
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func (pd *pollDesc) PrepareRead() error {
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return pd.Prepare('r')
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}
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func (pd *pollDesc) PrepareWrite() error {
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return pd.Prepare('w')
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}
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func (pd *pollDesc) Wait(mode int) error {
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res := runtime_pollWait(pd.runtimeCtx, mode)
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return convertErr(res)
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}
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func (pd *pollDesc) WaitRead() error {
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return pd.Wait('r')
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}
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func (pd *pollDesc) WaitWrite() error {
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return pd.Wait('w')
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}
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func (pd *pollDesc) WaitCanceled(mode int) {
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runtime_pollWaitCanceled(pd.runtimeCtx, mode)
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}
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func (pd *pollDesc) WaitCanceledRead() {
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pd.WaitCanceled('r')
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}
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func (pd *pollDesc) WaitCanceledWrite() {
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pd.WaitCanceled('w')
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}
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func convertErr(res int) error {
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switch res {
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case 0:
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return nil
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case 1:
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return errClosing
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case 2:
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return errTimeout
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}
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println("unreachable: ", res)
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panic("unreachable")
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}
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func (fd *netFD) setDeadline(t time.Time) error {
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return setDeadlineImpl(fd, t, 'r'+'w')
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}
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func (fd *netFD) setReadDeadline(t time.Time) error {
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return setDeadlineImpl(fd, t, 'r')
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}
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func (fd *netFD) 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 *netFD, t time.Time, mode int) error {
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d := runtimeNano() + int64(t.Sub(time.Now()))
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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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runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode)
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fd.decref()
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return nil
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}
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