// 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 linux package net import ( "sync" "syscall" "time" ) func runtime_pollServerInit() func runtime_pollOpen(fd int) (uintptr, int) func runtime_pollClose(ctx uintptr) func runtime_pollWait(ctx uintptr, mode int) int func runtime_pollReset(ctx uintptr, mode int) int func runtime_pollSetDeadline(ctx uintptr, d int64, mode int) func runtime_pollUnblock(ctx uintptr) var canCancelIO = true // used for testing current package type pollDesc struct { runtimeCtx uintptr } var serverInit sync.Once func sysInit() { } func (pd *pollDesc) Init(fd *netFD) error { serverInit.Do(runtime_pollServerInit) ctx, errno := runtime_pollOpen(fd.sysfd) if errno != 0 { return syscall.Errno(errno) } pd.runtimeCtx = ctx return nil } func (pd *pollDesc) Close() { runtime_pollClose(pd.runtimeCtx) } func (pd *pollDesc) Lock() { } func (pd *pollDesc) Unlock() { } func (pd *pollDesc) Wakeup() { } // Evict evicts fd from the pending list, unblocking any I/O running on fd. // Return value is whether the pollServer should be woken up. func (pd *pollDesc) Evict() bool { runtime_pollUnblock(pd.runtimeCtx) return false } func (pd *pollDesc) PrepareRead() error { res := runtime_pollReset(pd.runtimeCtx, 'r') return convertErr(res) } func (pd *pollDesc) PrepareWrite() error { res := runtime_pollReset(pd.runtimeCtx, 'w') return convertErr(res) } func (pd *pollDesc) WaitRead() error { res := runtime_pollWait(pd.runtimeCtx, 'r') return convertErr(res) } func (pd *pollDesc) WaitWrite() error { res := runtime_pollWait(pd.runtimeCtx, 'w') return convertErr(res) } func convertErr(res int) error { switch res { case 0: return nil case 1: return errClosing case 2: return errTimeout } panic("unreachable") } func setReadDeadline(fd *netFD, t time.Time) error { return setDeadlineImpl(fd, t, 'r') } func setWriteDeadline(fd *netFD, t time.Time) error { return setDeadlineImpl(fd, t, 'w') } func setDeadline(fd *netFD, t time.Time) error { return setDeadlineImpl(fd, t, 'r'+'w') } func setDeadlineImpl(fd *netFD, t time.Time, mode int) error { d := t.UnixNano() if t.IsZero() { d = 0 } if err := fd.incref(false); err != nil { return err } runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode) fd.decref() return nil }