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bf88c1247f
This is in preparation for making qio_channel_yield work on AioContexts other than the main one. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-6-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
354 lines
8.7 KiB
C
354 lines
8.7 KiB
C
/*
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* QEMU I/O channels watch helper APIs
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "io/channel-watch.h"
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typedef struct QIOChannelFDSource QIOChannelFDSource;
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struct QIOChannelFDSource {
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GSource parent;
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GPollFD fd;
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QIOChannel *ioc;
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GIOCondition condition;
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};
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#ifdef CONFIG_WIN32
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typedef struct QIOChannelSocketSource QIOChannelSocketSource;
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struct QIOChannelSocketSource {
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GSource parent;
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GPollFD fd;
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QIOChannel *ioc;
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SOCKET socket;
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int revents;
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GIOCondition condition;
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};
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#endif
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typedef struct QIOChannelFDPairSource QIOChannelFDPairSource;
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struct QIOChannelFDPairSource {
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GSource parent;
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GPollFD fdread;
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GPollFD fdwrite;
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QIOChannel *ioc;
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GIOCondition condition;
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};
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static gboolean
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qio_channel_fd_source_prepare(GSource *source G_GNUC_UNUSED,
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gint *timeout)
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{
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*timeout = -1;
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return FALSE;
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}
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static gboolean
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qio_channel_fd_source_check(GSource *source)
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{
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QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
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return ssource->fd.revents & ssource->condition;
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}
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static gboolean
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qio_channel_fd_source_dispatch(GSource *source,
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GSourceFunc callback,
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gpointer user_data)
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{
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QIOChannelFunc func = (QIOChannelFunc)callback;
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QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
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return (*func)(ssource->ioc,
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ssource->fd.revents & ssource->condition,
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user_data);
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}
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static void
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qio_channel_fd_source_finalize(GSource *source)
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{
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QIOChannelFDSource *ssource = (QIOChannelFDSource *)source;
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object_unref(OBJECT(ssource->ioc));
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}
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#ifdef CONFIG_WIN32
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static gboolean
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qio_channel_socket_source_prepare(GSource *source G_GNUC_UNUSED,
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gint *timeout)
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{
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*timeout = -1;
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return FALSE;
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}
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/*
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* NB, this impl only works when the socket is in non-blocking
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* mode on Win32
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*/
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static gboolean
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qio_channel_socket_source_check(GSource *source)
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{
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static struct timeval tv0;
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QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
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WSANETWORKEVENTS ev;
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fd_set rfds, wfds, xfds;
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if (!ssource->condition) {
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return 0;
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}
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WSAEnumNetworkEvents(ssource->socket, ssource->ioc->event, &ev);
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FD_ZERO(&rfds);
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FD_ZERO(&wfds);
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FD_ZERO(&xfds);
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if (ssource->condition & G_IO_IN) {
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FD_SET((SOCKET)ssource->socket, &rfds);
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}
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if (ssource->condition & G_IO_OUT) {
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FD_SET((SOCKET)ssource->socket, &wfds);
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}
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if (ssource->condition & G_IO_PRI) {
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FD_SET((SOCKET)ssource->socket, &xfds);
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}
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ssource->revents = 0;
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if (select(0, &rfds, &wfds, &xfds, &tv0) == 0) {
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return 0;
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}
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if (FD_ISSET(ssource->socket, &rfds)) {
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ssource->revents |= G_IO_IN;
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}
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if (FD_ISSET(ssource->socket, &wfds)) {
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ssource->revents |= G_IO_OUT;
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}
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if (FD_ISSET(ssource->socket, &xfds)) {
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ssource->revents |= G_IO_PRI;
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}
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return ssource->revents;
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}
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static gboolean
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qio_channel_socket_source_dispatch(GSource *source,
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GSourceFunc callback,
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gpointer user_data)
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{
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QIOChannelFunc func = (QIOChannelFunc)callback;
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QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
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return (*func)(ssource->ioc, ssource->revents, user_data);
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}
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static void
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qio_channel_socket_source_finalize(GSource *source)
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{
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QIOChannelSocketSource *ssource = (QIOChannelSocketSource *)source;
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object_unref(OBJECT(ssource->ioc));
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}
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GSourceFuncs qio_channel_socket_source_funcs = {
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qio_channel_socket_source_prepare,
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qio_channel_socket_source_check,
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qio_channel_socket_source_dispatch,
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qio_channel_socket_source_finalize
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};
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#endif
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static gboolean
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qio_channel_fd_pair_source_prepare(GSource *source G_GNUC_UNUSED,
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gint *timeout)
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{
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*timeout = -1;
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return FALSE;
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}
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static gboolean
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qio_channel_fd_pair_source_check(GSource *source)
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{
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QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
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GIOCondition poll_condition = ssource->fdread.revents |
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ssource->fdwrite.revents;
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return poll_condition & ssource->condition;
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}
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static gboolean
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qio_channel_fd_pair_source_dispatch(GSource *source,
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GSourceFunc callback,
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gpointer user_data)
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{
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QIOChannelFunc func = (QIOChannelFunc)callback;
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QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
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GIOCondition poll_condition = ssource->fdread.revents |
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ssource->fdwrite.revents;
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return (*func)(ssource->ioc,
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poll_condition & ssource->condition,
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user_data);
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}
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static void
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qio_channel_fd_pair_source_finalize(GSource *source)
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{
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QIOChannelFDPairSource *ssource = (QIOChannelFDPairSource *)source;
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object_unref(OBJECT(ssource->ioc));
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}
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GSourceFuncs qio_channel_fd_source_funcs = {
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qio_channel_fd_source_prepare,
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qio_channel_fd_source_check,
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qio_channel_fd_source_dispatch,
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qio_channel_fd_source_finalize
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};
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GSourceFuncs qio_channel_fd_pair_source_funcs = {
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qio_channel_fd_pair_source_prepare,
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qio_channel_fd_pair_source_check,
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qio_channel_fd_pair_source_dispatch,
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qio_channel_fd_pair_source_finalize
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};
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GSource *qio_channel_create_fd_watch(QIOChannel *ioc,
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int fd,
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GIOCondition condition)
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{
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GSource *source;
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QIOChannelFDSource *ssource;
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source = g_source_new(&qio_channel_fd_source_funcs,
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sizeof(QIOChannelFDSource));
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ssource = (QIOChannelFDSource *)source;
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ssource->ioc = ioc;
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object_ref(OBJECT(ioc));
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ssource->condition = condition;
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#ifdef CONFIG_WIN32
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ssource->fd.fd = (gint64)_get_osfhandle(fd);
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#else
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ssource->fd.fd = fd;
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#endif
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ssource->fd.events = condition;
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g_source_add_poll(source, &ssource->fd);
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return source;
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}
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#ifdef CONFIG_WIN32
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GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
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int socket,
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GIOCondition condition)
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{
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GSource *source;
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QIOChannelSocketSource *ssource;
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#ifdef WIN32
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WSAEventSelect(socket, ioc->event,
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FD_READ | FD_ACCEPT | FD_CLOSE |
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FD_CONNECT | FD_WRITE | FD_OOB);
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#endif
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source = g_source_new(&qio_channel_socket_source_funcs,
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sizeof(QIOChannelSocketSource));
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ssource = (QIOChannelSocketSource *)source;
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ssource->ioc = ioc;
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object_ref(OBJECT(ioc));
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ssource->condition = condition;
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ssource->socket = socket;
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ssource->revents = 0;
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ssource->fd.fd = (gintptr)ioc->event;
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ssource->fd.events = G_IO_IN;
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g_source_add_poll(source, &ssource->fd);
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return source;
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}
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#else
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GSource *qio_channel_create_socket_watch(QIOChannel *ioc,
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int socket,
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GIOCondition condition)
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{
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return qio_channel_create_fd_watch(ioc, socket, condition);
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}
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#endif
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GSource *qio_channel_create_fd_pair_watch(QIOChannel *ioc,
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int fdread,
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int fdwrite,
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GIOCondition condition)
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{
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GSource *source;
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QIOChannelFDPairSource *ssource;
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source = g_source_new(&qio_channel_fd_pair_source_funcs,
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sizeof(QIOChannelFDPairSource));
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ssource = (QIOChannelFDPairSource *)source;
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ssource->ioc = ioc;
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object_ref(OBJECT(ioc));
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ssource->condition = condition;
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#ifdef CONFIG_WIN32
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ssource->fdread.fd = (gint64)_get_osfhandle(fdread);
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ssource->fdwrite.fd = (gint64)_get_osfhandle(fdwrite);
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#else
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ssource->fdread.fd = fdread;
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ssource->fdwrite.fd = fdwrite;
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#endif
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ssource->fdread.events = condition & G_IO_IN;
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ssource->fdwrite.events = condition & G_IO_OUT;
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g_source_add_poll(source, &ssource->fdread);
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g_source_add_poll(source, &ssource->fdwrite);
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return source;
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}
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