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io: implement socket watch for win32 using WSAEventSelect+select

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On Win32 we cannot directly poll on socket handles. Instead we
create a Win32 event object and associate the socket handle with
the event. When the event signals readyness we then have to
use select to determine which events are ready. Creating Win32
events is moderately heavyweight, so we don't want todo it
every time we create a GSource, so this associates a single
event with a QIOChannel.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-03-07 12:12:36 +01:00 • committed by Daniel P. Berrange
parent 30fd3e2790
commit a589720567
4 changed files with 170 additions and 7 deletions
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34
io/channel-socket.c
View file

@ -55,6 +55,10 @@ qio_channel_socket_new(void)
ioc = QIO_CHANNEL(sioc);
ioc->features |= (1 << QIO_CHANNEL_FEATURE_SHUTDOWN);
#ifdef WIN32
ioc->event = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
trace_qio_channel_socket_new(sioc);
return sioc;
@ -341,6 +345,11 @@ qio_channel_socket_accept(QIOChannelSocket *ioc,
cioc->remoteAddrLen = sizeof(ioc->remoteAddr);
cioc->localAddrLen = sizeof(ioc->localAddr);
#ifdef WIN32
QIO_CHANNEL(cioc)->event = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
retry:
trace_qio_channel_socket_accept(ioc);
cioc->fd = qemu_accept(ioc->fd, (struct sockaddr *)&cioc->remoteAddr,
@ -384,7 +393,10 @@ static void qio_channel_socket_finalize(Object *obj)
{
QIOChannelSocket *ioc = QIO_CHANNEL_SOCKET(obj);
if (ioc->fd != -1) {
close(ioc->fd);
#ifdef WIN32
WSAEventSelect(ioc->fd, NULL, 0);
#endif
closesocket(ioc->fd);
ioc->fd = -1;
}
}
@ -634,6 +646,11 @@ qio_channel_socket_set_blocking(QIOChannel *ioc,
qemu_set_block(sioc->fd);
} else {
qemu_set_nonblock(sioc->fd);
#ifdef WIN32
WSAEventSelect(sioc->fd, ioc->event,
FD_READ | FD_ACCEPT | FD_CLOSE |
FD_CONNECT | FD_WRITE | FD_OOB);
#endif
}
return 0;
}
@ -669,13 +686,18 @@ qio_channel_socket_close(QIOChannel *ioc,
{
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
if (closesocket(sioc->fd) < 0) {
if (sioc->fd != -1) {
#ifdef WIN32
WSAEventSelect(sioc->fd, NULL, 0);
#endif
if (closesocket(sioc->fd) < 0) {
sioc->fd = -1;
error_setg_errno(errp, socket_error(),
"Unable to close socket");
return -1;
}
sioc->fd = -1;
error_setg_errno(errp, socket_error(),
"Unable to close socket");
return -1;
}
sioc->fd = -1;
return 0;
}