Imported Upstream version 1.4upstream/1.4

1 files changed, 144 insertions, 0 deletions

diff --git a/src/net/fd_poll_runtime.go b/src/net/fd_poll_runtime.go
new file mode 100644
index 000000000..2bddc836c
--- /dev/null
+++ b/src/net/fd_poll_runtime.go
@@ -0,0 +1,144 @@
+// 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 (
+	"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))
+	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
+}
+
+func (pd *pollDesc) Lock() {
+}
+
+func (pd *pollDesc) Unlock() {
+}
+
+func (pd *pollDesc) Wakeup() {
+}
+
+// Evict evicts fd from the pending list, unblocking any I/O running on fd.
+// Return value is whether the pollServer should be woken up.
+func (pd *pollDesc) Evict() bool {
+	if pd.runtimeCtx == 0 {
+		return false
+	}
+	runtime_pollUnblock(pd.runtimeCtx)
+	return false
+}
+
+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 {
+	d := runtimeNano() + int64(t.Sub(time.Now()))
+	if t.IsZero() {
+		d = 0
+	}
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode)
+	fd.decref()
+	return nil
+}