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qio: introduce qio_channel_add_watch_{full|source}

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Firstly, introduce an internal qio_channel_add_watch_full(), which
enhances qio_channel_add_watch() that context can be specified.

Then add a new API wrapper qio_channel_add_watch_source() to return a
GSource pointer rather than a tag ID.

Note that the _source() call will keep a reference of GSource so that
callers need to unref them explicitly when finished using the GSource.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Peter Xu 2018-03-05 14:43:20 +08:00 committed by Daniel P. Berrangé
parent 7c28768fef
commit 315409c711
2 changed files with 78 additions and 6 deletions
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44
include/io/channel.h
View File

@ -648,6 +648,50 @@ guint qio_channel_add_watch(QIOChannel *ioc,
gpointer user_data,
GDestroyNotify notify);
/**
* qio_channel_add_watch_full:
* @ioc: the channel object
* @condition: the I/O condition to monitor
* @func: callback to invoke when the source becomes ready
* @user_data: opaque data to pass to @func
* @notify: callback to free @user_data
* @context: the context to run the watch source
*
* Similar as qio_channel_add_watch(), but allows to specify context
* to run the watch source.
*
* Returns: the source ID
*/
guint qio_channel_add_watch_full(QIOChannel *ioc,
GIOCondition condition,
QIOChannelFunc func,
gpointer user_data,
GDestroyNotify notify,
GMainContext *context);
/**
* qio_channel_add_watch_source:
* @ioc: the channel object
* @condition: the I/O condition to monitor
* @func: callback to invoke when the source becomes ready
* @user_data: opaque data to pass to @func
* @notify: callback to free @user_data
* @context: gcontext to bind the source to
*
* Similar as qio_channel_add_watch(), but allows to specify context
* to run the watch source, meanwhile return the GSource object
* instead of tag ID, with the GSource referenced already.
*
* Note: callers is responsible to unref the source when not needed.
*
* Returns: the source pointer
*/
GSource *qio_channel_add_watch_source(QIOChannel *ioc,
GIOCondition condition,
QIOChannelFunc func,
gpointer user_data,
GDestroyNotify notify,
GMainContext *context);
/**
* qio_channel_attach_aio_context:

34
io/channel.c
View File

@ -299,11 +299,12 @@ void qio_channel_set_aio_fd_handler(QIOChannel *ioc,
klass->io_set_aio_fd_handler(ioc, ctx, io_read, io_write, opaque);
}
guint qio_channel_add_watch(QIOChannel *ioc,
guint qio_channel_add_watch_full(QIOChannel *ioc,
GIOCondition condition,
QIOChannelFunc func,
gpointer user_data,
GDestroyNotify notify)
GDestroyNotify notify,
GMainContext *context)
{
GSource *source;
guint id;
@ -312,12 +313,39 @@ guint qio_channel_add_watch(QIOChannel *ioc,
g_source_set_callback(source, (GSourceFunc)func, user_data, notify);
id = g_source_attach(source, NULL);
id = g_source_attach(source, context);
g_source_unref(source);
return id;
}
guint qio_channel_add_watch(QIOChannel *ioc,
GIOCondition condition,
QIOChannelFunc func,
gpointer user_data,
GDestroyNotify notify)
{
return qio_channel_add_watch_full(ioc, condition, func,
user_data, notify, NULL);
}
GSource *qio_channel_add_watch_source(QIOChannel *ioc,
GIOCondition condition,
QIOChannelFunc func,
gpointer user_data,
GDestroyNotify notify,
GMainContext *context)
{
GSource *source;
guint id;
id = qio_channel_add_watch_full(ioc, condition, func,
user_data, notify, context);
source = g_main_context_find_source_by_id(context, id);
g_source_ref(source);
return source;
}
int qio_channel_shutdown(QIOChannel *ioc,
QIOChannelShutdown how,