gcc/libgo/go/runtime/netpoll_kqueue.go
Ian Lance Taylor f8d9fa9e80 libgo, compiler: Upgrade libgo to Go 1.4, except for runtime.
This upgrades all of libgo other than the runtime package to
the Go 1.4 release.  In Go 1.4 much of the runtime was
rewritten into Go.  Merging that code will take more time and
will not change the API, so I'm putting it off for now.

There are a few runtime changes anyhow, to accomodate other
packages that rely on minor modifications to the runtime
support.

The compiler changes slightly to add a one-bit flag to each
type descriptor kind that is stored directly in an interface,
which for gccgo is currently only pointer types.  Another
one-bit flag (gcprog) is reserved because it is used by the gc
compiler, but gccgo does not currently use it.

There is another error check in the compiler since I ran
across it during testing.

gotools/:
	* Makefile.am (go_cmd_go_files): Sort entries.  Add generate.go.
	* Makefile.in: Rebuild.

From-SVN: r219627
2015-01-15 00:27:56 +00:00

102 lines
2.2 KiB
Go

// 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 netbsd openbsd
package runtime
// Integrated network poller (kqueue-based implementation).
import "unsafe"
func kqueue() int32
//go:noescape
func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32
func closeonexec(fd int32)
var (
kq int32 = -1
netpolllasterr int32
)
func netpollinit() {
kq = kqueue()
if kq < 0 {
println("netpollinit: kqueue failed with", -kq)
gothrow("netpollinit: kqueue failed")
}
closeonexec(kq)
}
func netpollopen(fd uintptr, pd *pollDesc) int32 {
// Arm both EVFILT_READ and EVFILT_WRITE in edge-triggered mode (EV_CLEAR)
// for the whole fd lifetime. The notifications are automatically unregistered
// when fd is closed.
var ev [2]keventt
*(*uintptr)(unsafe.Pointer(&ev[0].ident)) = fd
ev[0].filter = _EVFILT_READ
ev[0].flags = _EV_ADD | _EV_CLEAR
ev[0].fflags = 0
ev[0].data = 0
ev[0].udata = (*byte)(unsafe.Pointer(pd))
ev[1] = ev[0]
ev[1].filter = _EVFILT_WRITE
n := kevent(kq, &ev[0], 2, nil, 0, nil)
if n < 0 {
return -n
}
return 0
}
func netpollclose(fd uintptr) int32 {
// Don't need to unregister because calling close()
// on fd will remove any kevents that reference the descriptor.
return 0
}
func netpollarm(pd *pollDesc, mode int) {
gothrow("unused")
}
// Polls for ready network connections.
// Returns list of goroutines that become runnable.
func netpoll(block bool) (gp *g) {
if kq == -1 {
return
}
var tp *timespec
var ts timespec
if !block {
tp = &ts
}
var events [64]keventt
retry:
n := kevent(kq, nil, 0, &events[0], int32(len(events)), tp)
if n < 0 {
if n != -_EINTR && n != netpolllasterr {
netpolllasterr = n
println("runtime: kevent on fd", kq, "failed with", -n)
}
goto retry
}
for i := 0; i < int(n); i++ {
ev := &events[i]
var mode int32
if ev.filter == _EVFILT_READ {
mode += 'r'
}
if ev.filter == _EVFILT_WRITE {
mode += 'w'
}
if mode != 0 {
netpollready((**g)(noescape(unsafe.Pointer(&gp))), (*pollDesc)(unsafe.Pointer(ev.udata)), mode)
}
}
if block && gp == nil {
goto retry
}
return gp
}