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internal/poll: don't add non-sockets to runtime poller

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Updates #21172

Change-Id: I0fec6e645328bbc85f3e47f4f71dd8d1d68c75ab
Reviewed-on: https://go-review.googlesource.com/52551
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Ian Lance Taylor 2017-08-01 16:05:17 -07:00
parent 664cd26c89
commit f396fa4285
1 changed files with 19 additions and 2 deletions
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21
src/internal/poll/fd_windows.go
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@ -154,6 +154,10 @@ func (s *ioSrv) ProcessRemoteIO() {
// is available. Alternatively, it passes the request onto
// runtime netpoll and waits for completion or cancels request.
func (s *ioSrv) ExecIO(o *operation, submit func(o *operation) error) (int, error) {
if o.fd.pd.runtimeCtx == 0 {
return 0, errors.New("internal error: polling on unsupported descriptor type")
}
if !canCancelIO {
onceStartServer.Do(startServer)
}
@ -315,8 +319,21 @@ func (fd *FD) Init(net string) (string, error) {
return "", errors.New("internal error: unknown network type " + net)
}
if err := fd.pd.init(fd); err != nil {
return "", err
if !fd.isFile && !fd.isConsole && !fd.isDir {
// Only call init for a network socket.
// This means that we don't add files to the runtime poller.
// Adding files to the runtime poller can confuse matters
// if the user is doing their own overlapped I/O.
// See issue #21172.
//
// In general the code below avoids calling the ExecIO
// method for non-network sockets. If some method does
// somehow call ExecIO, then ExecIO, and therefore the
// calling method, will return an error, because
// fd.pd.runtimeCtx will be 0.
if err := fd.pd.init(fd); err != nil {
return "", err
}
}
if hasLoadSetFileCompletionNotificationModes {
// We do not use events, so we can skip them always.