gitee.com/ks-custle/core-gm@v0.0.0-20230922171213-b83bdd97b62c/internal/poll/fd_poll_js.go (about) 1 // Copyright 2013 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build js && wasm 6 // +build js,wasm 7 8 package poll 9 10 import ( 11 "syscall" 12 "time" 13 ) 14 15 type pollDesc struct { 16 fd *FD 17 closing bool 18 } 19 20 func (pd *pollDesc) init(fd *FD) error { pd.fd = fd; return nil } 21 22 func (pd *pollDesc) close() {} 23 24 func (pd *pollDesc) evict() { 25 pd.closing = true 26 if pd.fd != nil { 27 syscall.StopIO(pd.fd.Sysfd) 28 } 29 } 30 31 func (pd *pollDesc) prepare(mode int, isFile bool) error { 32 if pd.closing { 33 return errClosing(isFile) 34 } 35 return nil 36 } 37 38 func (pd *pollDesc) prepareRead(isFile bool) error { return pd.prepare('r', isFile) } 39 40 func (pd *pollDesc) prepareWrite(isFile bool) error { return pd.prepare('w', isFile) } 41 42 func (pd *pollDesc) wait(mode int, isFile bool) error { 43 if pd.closing { 44 return errClosing(isFile) 45 } 46 if isFile { // TODO(neelance): wasm: Use callbacks from JS to block until the read/write finished. 47 return nil 48 } 49 return ErrDeadlineExceeded 50 } 51 52 func (pd *pollDesc) waitRead(isFile bool) error { return pd.wait('r', isFile) } 53 54 func (pd *pollDesc) waitWrite(isFile bool) error { return pd.wait('w', isFile) } 55 56 func (pd *pollDesc) waitCanceled(mode int) {} 57 58 func (pd *pollDesc) pollable() bool { return true } 59 60 // SetDeadline sets the read and write deadlines associated with fd. 61 func (fd *FD) SetDeadline(t time.Time) error { 62 return setDeadlineImpl(fd, t, 'r'+'w') 63 } 64 65 // SetReadDeadline sets the read deadline associated with fd. 66 func (fd *FD) SetReadDeadline(t time.Time) error { 67 return setDeadlineImpl(fd, t, 'r') 68 } 69 70 // SetWriteDeadline sets the write deadline associated with fd. 71 func (fd *FD) SetWriteDeadline(t time.Time) error { 72 return setDeadlineImpl(fd, t, 'w') 73 } 74 75 func setDeadlineImpl(fd *FD, t time.Time, mode int) error { 76 d := t.UnixNano() 77 if t.IsZero() { 78 d = 0 79 } 80 if err := fd.incref(); err != nil { 81 return err 82 } 83 switch mode { 84 case 'r': 85 syscall.SetReadDeadline(fd.Sysfd, d) 86 case 'w': 87 syscall.SetWriteDeadline(fd.Sysfd, d) 88 case 'r' + 'w': 89 syscall.SetReadDeadline(fd.Sysfd, d) 90 syscall.SetWriteDeadline(fd.Sysfd, d) 91 } 92 fd.decref() 93 return nil 94 } 95 96 // IsPollDescriptor reports whether fd is the descriptor being used by the poller. 97 // This is only used for testing. 98 func IsPollDescriptor(fd uintptr) bool { 99 return false 100 }