io: add ability to associate an opaque "result" with with a task

Currently there is no data associated with a successful
task completion. This adds an opaque pointer to the task
to store an arbitrary result.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/io/task.c b/io/task.c
index a763990d47..675e196156 100644
--- a/io/task.c
+++ b/io/task.c
@@ -29,6 +29,8 @@ struct QIOTask {
     QIOTaskFunc func;
     gpointer opaque;
     GDestroyNotify destroy;
+    gpointer result;
+    GDestroyNotify destroyResult;
 };
 
 
@@ -57,6 +59,9 @@ static void qio_task_free(QIOTask *task)
     if (task->destroy) {
         task->destroy(task->opaque);
     }
+    if (task->destroyResult) {
+        task->destroyResult(task->result);
+    }
     object_unref(task->source);
 
     g_free(task);
@@ -154,6 +159,21 @@ void qio_task_abort(QIOTask *task,
 }
 
 
+void qio_task_set_result_pointer(QIOTask *task,
+                                 gpointer result,
+                                 GDestroyNotify destroy)
+{
+    task->result = result;
+    task->destroyResult = destroy;
+}
+
+
+gpointer qio_task_get_result_pointer(QIOTask *task)
+{
+    return task->result;
+}
+
+
 Object *qio_task_get_source(QIOTask *task)
 {
     return task->source;