f8d9fa9e80
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
102 lines
2.2 KiB
Go
102 lines
2.2 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 netbsd openbsd
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package runtime
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// Integrated network poller (kqueue-based implementation).
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import "unsafe"
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func kqueue() int32
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//go:noescape
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func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32
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func closeonexec(fd int32)
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var (
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kq int32 = -1
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netpolllasterr int32
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)
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func netpollinit() {
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kq = kqueue()
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if kq < 0 {
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println("netpollinit: kqueue failed with", -kq)
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gothrow("netpollinit: kqueue failed")
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}
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closeonexec(kq)
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}
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func netpollopen(fd uintptr, pd *pollDesc) int32 {
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// Arm both EVFILT_READ and EVFILT_WRITE in edge-triggered mode (EV_CLEAR)
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// for the whole fd lifetime. The notifications are automatically unregistered
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// when fd is closed.
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var ev [2]keventt
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*(*uintptr)(unsafe.Pointer(&ev[0].ident)) = fd
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ev[0].filter = _EVFILT_READ
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ev[0].flags = _EV_ADD | _EV_CLEAR
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ev[0].fflags = 0
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ev[0].data = 0
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ev[0].udata = (*byte)(unsafe.Pointer(pd))
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ev[1] = ev[0]
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ev[1].filter = _EVFILT_WRITE
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n := kevent(kq, &ev[0], 2, nil, 0, nil)
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if n < 0 {
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return -n
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}
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return 0
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}
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func netpollclose(fd uintptr) int32 {
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// Don't need to unregister because calling close()
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// on fd will remove any kevents that reference the descriptor.
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return 0
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}
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func netpollarm(pd *pollDesc, mode int) {
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gothrow("unused")
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}
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// Polls for ready network connections.
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// Returns list of goroutines that become runnable.
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func netpoll(block bool) (gp *g) {
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if kq == -1 {
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return
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}
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var tp *timespec
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var ts timespec
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if !block {
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tp = &ts
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}
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var events [64]keventt
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retry:
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n := kevent(kq, nil, 0, &events[0], int32(len(events)), tp)
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if n < 0 {
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if n != -_EINTR && n != netpolllasterr {
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netpolllasterr = n
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println("runtime: kevent on fd", kq, "failed with", -n)
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}
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goto retry
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}
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for i := 0; i < int(n); i++ {
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ev := &events[i]
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var mode int32
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if ev.filter == _EVFILT_READ {
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mode += 'r'
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}
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if ev.filter == _EVFILT_WRITE {
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mode += 'w'
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}
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if mode != 0 {
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netpollready((**g)(noescape(unsafe.Pointer(&gp))), (*pollDesc)(unsafe.Pointer(ev.udata)), mode)
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}
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}
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if block && gp == nil {
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goto retry
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}
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return gp
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}
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