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chardev: use a child source for qio input source 

GLib child source were added with version 2.28. We can use them now
that we bumped our requirement to 2.40.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-08-27 15:48:24 +02:00
parent 95e30b2a13
commit a7077b8e35
1 changed files with 5 additions and 43 deletions
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48
chardev/char-io.c
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@ -33,7 +33,6 @@ typedef struct IOWatchPoll {
IOCanReadHandler *fd_can_read;
GSourceFunc fd_read;
void *opaque;
GMainContext *context;
} IOWatchPoll;
static IOWatchPoll *io_watch_poll_from_source(GSource *source)
@ -55,47 +54,24 @@ static gboolean io_watch_poll_prepare(GSource *source,
iwp->src = qio_channel_create_watch(
iwp->ioc, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL);
g_source_set_callback(iwp->src, iwp->fd_read, iwp->opaque, NULL);
g_source_attach(iwp->src, iwp->context);
} else {
g_source_destroy(iwp->src);
g_source_add_child_source(source, iwp->src);
g_source_unref(iwp->src);
} else {
g_source_remove_child_source(source, iwp->src);
iwp->src = NULL;
}
return FALSE;
}
static gboolean io_watch_poll_check(GSource *source)
{
return FALSE;
}
static gboolean io_watch_poll_dispatch(GSource *source, GSourceFunc callback,
gpointer user_data)
{
abort();
}
static void io_watch_poll_finalize(GSource *source)
{
/* Due to a glib bug, removing the last reference to a source
* inside a finalize callback causes recursive locking (and a
* deadlock). This is not a problem inside other callbacks,
* including dispatch callbacks, so we call io_remove_watch_poll
* to remove this source. At this point, iwp->src must
* be NULL, or we would leak it.
*
* This would be solved much more elegantly by child sources,
* but we support older glib versions that do not have them.
*/
IOWatchPoll *iwp = io_watch_poll_from_source(source);
assert(iwp->src == NULL);
return G_SOURCE_CONTINUE;
}
static GSourceFuncs io_watch_poll_funcs = {
.prepare = io_watch_poll_prepare,
.check = io_watch_poll_check,
.dispatch = io_watch_poll_dispatch,
.finalize = io_watch_poll_finalize,
};
GSource *io_add_watch_poll(Chardev *chr,
@ -115,7 +91,6 @@ GSource *io_add_watch_poll(Chardev *chr,
iwp->ioc = ioc;
iwp->fd_read = (GSourceFunc) fd_read;
iwp->src = NULL;
iwp->context = context;
name = g_strdup_printf("chardev-iowatch-%s", chr->label);
g_source_set_name((GSource *)iwp, name);
@ -126,23 +101,10 @@ GSource *io_add_watch_poll(Chardev *chr,
return (GSource *)iwp;
}
static void io_remove_watch_poll(GSource *source)
{
IOWatchPoll *iwp;
iwp = io_watch_poll_from_source(source);
if (iwp->src) {
g_source_destroy(iwp->src);
g_source_unref(iwp->src);
iwp->src = NULL;
}
g_source_destroy(&iwp->parent);
}
void remove_fd_in_watch(Chardev *chr)
{
if (chr->gsource) {
io_remove_watch_poll(chr->gsource);
g_source_destroy(chr->gsource);
chr->gsource = NULL;
}
}