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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.
// +build darwin dragonfly freebsd linux netbsd openbsd windows solaris
package net
import (
"runtime"
"sync"
"syscall"
"time"
)
// runtimeNano returns the current value of the runtime clock in nanoseconds.
func runtimeNano() int64
func runtime_pollServerInit()
func runtime_pollOpen(fd uintptr) (uintptr, int)
func runtime_pollClose(ctx uintptr)
func runtime_pollWait(ctx uintptr, mode int) int
func runtime_pollWaitCanceled(ctx uintptr, mode int) int
func runtime_pollReset(ctx uintptr, mode int) int
func runtime_pollSetDeadline(ctx uintptr, d int64, mode int)
func runtime_pollUnblock(ctx uintptr)
type pollDesc struct {
runtimeCtx uintptr
}
var serverInit sync.Once
func (pd *pollDesc) init(fd *netFD) error {
serverInit.Do(runtime_pollServerInit)
ctx, errno := runtime_pollOpen(uintptr(fd.sysfd))
runtime.KeepAlive(fd)
if errno != 0 {
return syscall.Errno(errno)
}
pd.runtimeCtx = ctx
return nil
}
func (pd *pollDesc) close() {
if pd.runtimeCtx == 0 {
return
}
runtime_pollClose(pd.runtimeCtx)
pd.runtimeCtx = 0
}
// Evict evicts fd from the pending list, unblocking any I/O running on fd.
func (pd *pollDesc) evict() {
if pd.runtimeCtx == 0 {
return
}
runtime_pollUnblock(pd.runtimeCtx)
}
func (pd *pollDesc) prepare(mode int) error {
res := runtime_pollReset(pd.runtimeCtx, mode)
return convertErr(res)
}
func (pd *pollDesc) prepareRead() error {
return pd.prepare('r')
}
func (pd *pollDesc) prepareWrite() error {
return pd.prepare('w')
}
func (pd *pollDesc) wait(mode int) error {
res := runtime_pollWait(pd.runtimeCtx, mode)
return convertErr(res)
}
func (pd *pollDesc) waitRead() error {
return pd.wait('r')
}
func (pd *pollDesc) waitWrite() error {
return pd.wait('w')
}
func (pd *pollDesc) waitCanceled(mode int) {
runtime_pollWaitCanceled(pd.runtimeCtx, mode)
}
func (pd *pollDesc) waitCanceledRead() {
pd.waitCanceled('r')
}
func (pd *pollDesc) waitCanceledWrite() {
pd.waitCanceled('w')
}
func convertErr(res int) error {
switch res {
case 0:
return nil
case 1:
return errClosing
case 2:
return errTimeout
}
println("unreachable: ", res)
panic("unreachable")
}
func (fd *netFD) setDeadline(t time.Time) error {
return setDeadlineImpl(fd, t, 'r'+'w')
}
func (fd *netFD) setReadDeadline(t time.Time) error {
return setDeadlineImpl(fd, t, 'r')
}
func (fd *netFD) setWriteDeadline(t time.Time) error {
return setDeadlineImpl(fd, t, 'w')
}
func setDeadlineImpl(fd *netFD, t time.Time, mode int) error {
diff := int64(time.Until(t))
d := runtimeNano() + diff
if d <= 0 && diff > 0 {
// If the user has a deadline in the future, but the delay calculation
// overflows, then set the deadline to the maximum possible value.
d = 1<<63 - 1
}
if t.IsZero() {
d = 0
}
if err := fd.incref(); err != nil {
return err
}
runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode)
fd.decref()
return nil
}