mirror of
https://github.com/golang/go
synced 2024-11-19 00:44:40 -07:00
b2a950bb73
Rename "gothrow" to "throw" now that the C version of "throw" is no longer needed. This change is purely mechanical except in panic.go where the old version of "throw" has been deleted. sed -i "" 's/[[:<:]]gothrow[[:>:]]/throw/g' runtime/*.go Change-Id: Icf0752299c35958b92870a97111c67bcd9159dc3 Reviewed-on: https://go-review.googlesource.com/2150 Reviewed-by: Minux Ma <minux@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net>
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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throw("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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throw("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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