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net: let OS-specific AddFD routine wake up polling thread.

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With gccgo some operating systems require using select rather
than epoll or kevent.  Using select means that we have to wake
up the polling thread each time we add a new file descriptor.
This implements that in the generic code rather than adding
another wakeup channel, even though nothing in the current net
package uses the capability.

R=rsc, iant2
CC=golang-dev
https://golang.org/cl/4284069
This commit is contained in:
Ian Lance Taylor 2011-03-28 12:39:09 -07:00
parent 5be77a204b
commit 0caa0c0923
5 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/pkg/net/fd.go
View File

@ -122,9 +122,13 @@ func (s *pollServer) AddFD(fd *netFD, mode int) {
doWakeup = true
}
if err := s.poll.AddFD(intfd, mode, false); err != nil {
wake, err := s.poll.AddFD(intfd, mode, false)
if err != nil {
panic("pollServer AddFD " + err.String())
}
if wake {
doWakeup = true
}
s.Unlock()

10
src/pkg/net/fd_darwin.go
View File

@ -31,7 +31,7 @@ func newpollster() (p *pollster, err os.Error) {
return p, nil
}
func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, os.Error) {
// pollServer is locked.
var kmode int
@ -53,15 +53,15 @@ func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
n, e := syscall.Kevent(p.kq, p.kbuf[0:], p.kbuf[0:], nil)
if e != 0 {
return os.NewSyscallError("kevent", e)
return false, os.NewSyscallError("kevent", e)
}
if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
return os.ErrorString("kqueue phase error")
return false, os.ErrorString("kqueue phase error")
}
if ev.Data != 0 {
return os.Errno(int(ev.Data))
return false, os.Errno(int(ev.Data))
}
return nil
return false, nil
}
func (p *pollster) DelFD(fd int, mode int) {

10
src/pkg/net/fd_freebsd.go
View File

@ -31,7 +31,7 @@ func newpollster() (p *pollster, err os.Error) {
return p, nil
}
func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, os.Error) {
// pollServer is locked.
var kmode int
@ -51,15 +51,15 @@ func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
n, e := syscall.Kevent(p.kq, p.kbuf[:], nil, nil)
if e != 0 {
return os.NewSyscallError("kevent", e)
return false, os.NewSyscallError("kevent", e)
}
if n != 1 || (ev.Flags&syscall.EV_ERROR) == 0 || int(ev.Ident) != fd || int(ev.Filter) != kmode {
return os.NewSyscallError("kqueue phase error", e)
return false, os.NewSyscallError("kqueue phase error", e)
}
if ev.Data != 0 {
return os.Errno(int(ev.Data))
return false, os.Errno(int(ev.Data))
}
return nil
return false, nil
}
func (p *pollster) DelFD(fd int, mode int) {

6
src/pkg/net/fd_linux.go
View File

@ -47,7 +47,7 @@ func newpollster() (p *pollster, err os.Error) {
return p, nil
}
func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
func (p *pollster) AddFD(fd int, mode int, repeat bool) (bool, os.Error) {
// pollServer is locked.
var already bool
@ -69,10 +69,10 @@ func (p *pollster) AddFD(fd int, mode int, repeat bool) os.Error {
op = syscall.EPOLL_CTL_ADD
}
if e := syscall.EpollCtl(p.epfd, op, fd, &p.ctlEvent); e != 0 {
return os.NewSyscallError("epoll_ctl", e)
return false, os.NewSyscallError("epoll_ctl", e)
}
p.events[fd] = p.ctlEvent.Events
return nil
return false, nil
}
func (p *pollster) StopWaiting(fd int, bits uint) {

2
src/pkg/net/newpollserver.go
View File

@ -31,7 +31,7 @@ func newPollServer() (s *pollServer, err os.Error) {
if s.poll, err = newpollster(); err != nil {
goto Error
}
if err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
s.poll.Close()
goto Error
}