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GeezerVison is showing github.com — netpoll/poll_default_bsd.go at main · stop-coding/netpoll Expand file tree/ Copy pathpoll_default_bsd.goMore file actions 190 lines (179 loc) · 4.98 KB / Copy pathpoll_default_bsd.goFile metadata and controls190 lines (179 loc) · 4.98 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 // Copyright 2021 CloudWeGo Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // +build darwin netbsd freebsd openbsd dragonfly // +build !race package netpoll import ( "log" "sync/atomic" "syscall" "unsafe" ) func openPoll() Poll { return openDefaultPoll() } func openDefaultPoll() *defaultPoll { l := new(defaultPoll) p, err := syscall.Kqueue() if err != nil { panic(err) } l.fd = p _, err = syscall.Kevent(l.fd, []syscall.Kevent_t{{ Ident: 0, Filter: syscall.EVFILT_USER, Flags: syscall.EV_ADD | syscall.EV_CLEAR, }}, nil, nil) if err != nil { panic(err) } return l } type defaultPoll struct { fd int trigger uint32 } // Wait implements Poll. func (p *defaultPoll) Wait() error { // init var size, caps = 1024, barriercap var events, barriers = make([]syscall.Kevent_t, size), make([]barrier, size) for i := range barriers { barriers[i].bs = make([][]byte, caps) barriers[i].ivs = make([]syscall.Iovec, caps) } // wait for { var hups []*FDOperator n, err := syscall.Kevent(p.fd, nil, events, nil) if err != nil && err != syscall.EINTR { // exit gracefully if err == syscall.EBADF { return nil } return err } for i := 0; i < n; i++ { // trigger if events[i].Ident == 0 { // clean trigger atomic.StoreUint32(&p.trigger, 0) continue } var operator = *(**FDOperator)(unsafe.Pointer(&events[i].Udata)) if !operator.do() { continue } switch { case events[i].Flags&syscall.EV_EOF != 0: hups = append(hups, operator) case events[i].Filter == syscall.EVFILT_READ && events[i].Flags&syscall.EV_ENABLE != 0: // for non-connection if operator.OnRead != nil { operator.OnRead(p) break } // only for connection var bs = operator.Inputs(barriers[i].bs) if len(bs) == 0 { break } var n, err = readv(operator.FD, bs, barriers[i].ivs) operator.InputAck(n) if err != nil && err != syscall.EAGAIN && err != syscall.EINTR { log.Printf("readv(fd=%d) failed: %s", operator.FD, err.Error()) hups = append(hups, operator) } case events[i].Filter == syscall.EVFILT_WRITE && events[i].Flags&syscall.EV_ENABLE != 0: // for non-connection if operator.OnWrite != nil { operator.OnWrite(p) break } // only for connection var bs, supportZeroCopy = operator.Outputs(barriers[i].bs) if len(bs) == 0 { break } // TODO: Let the upper layer pass in whether to use ZeroCopy. var n, err = sendmsg(operator.FD, bs, barriers[i].ivs, false && supportZeroCopy) operator.OutputAck(n) if err != nil && err != syscall.EAGAIN { log.Printf("sendmsg(fd=%d) failed: %s", operator.FD, err.Error()) hups = append(hups, operator) } } operator.done() } // hup conns together to avoid blocking the poll. if len(hups) > 0 { p.detaches(hups) } } } // TODO: Close will bad file descriptor here func (p *defaultPoll) Close() error { var err = syscall.Close(p.fd) return err } // Trigger implements Poll. func (p *defaultPoll) Trigger() error { if atomic.AddUint32(&p.trigger, 1) > 1 { return nil } _, err := syscall.Kevent(p.fd, []syscall.Kevent_t{{ Ident: 0, Filter: syscall.EVFILT_USER, Fflags: syscall.NOTE_TRIGGER, }}, nil, nil) return err } // Control implements Poll. func (p *defaultPoll) Control(operator *FDOperator, event PollEvent) error { var evs = make([]syscall.Kevent_t, 1) evs[0].Ident = uint64(operator.FD) *(**FDOperator)(unsafe.Pointer(&evs[0].Udata)) = operator switch event { case PollReadable, PollModReadable: operator.inuse() evs[0].Filter, evs[0].Flags = syscall.EVFILT_READ, syscall.EV_ADD|syscall.EV_ENABLE case PollDetach: defer operator.unused() evs[0].Filter, evs[0].Flags = syscall.EVFILT_READ, syscall.EV_DELETE|syscall.EV_ONESHOT case PollWritable: operator.inuse() evs[0].Filter, evs[0].Flags = syscall.EVFILT_WRITE, syscall.EV_ADD|syscall.EV_ENABLE|syscall.EV_ONESHOT case PollR2RW: evs[0].Filter, evs[0].Flags = syscall.EVFILT_WRITE, syscall.EV_ADD|syscall.EV_ENABLE case PollRW2R: evs[0].Filter, evs[0].Flags = syscall.EVFILT_WRITE, syscall.EV_DELETE|syscall.EV_ONESHOT } _, err := syscall.Kevent(p.fd, evs, nil, nil) return err } func (p *defaultPoll) detaches(hups []*FDOperator) error { var onhups = make([]func(p Poll) error, len(hups)) for i := range hups { onhups[i] = hups[i].OnHup p.Control(hups[i], PollDetach) } go func(onhups []func(p Poll) error) { for i := range onhups { if onhups[i] != nil { onhups[i](p) } } }(onhups) return nil } |
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