io: add ability to associate an error with a task

Currently when a task fails, the error is never explicitly
associated with the task object, it is just passed along
through the completion callback. This adds the ability to
explicitly associate an error with the task.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/io/task.c b/io/task.c
index 675e196156..1394e05200 100644
--- a/io/task.c
+++ b/io/task.c
@@ -29,6 +29,7 @@ struct QIOTask {
     QIOTaskFunc func;
     gpointer opaque;
     GDestroyNotify destroy;
+    Error *err;
     gpointer result;
     GDestroyNotify destroyResult;
 };
@@ -62,6 +63,9 @@ static void qio_task_free(QIOTask *task)
     if (task->destroyResult) {
         task->destroyResult(task->result);
     }
+    if (task->err) {
+        error_free(task->err);
+    }
     object_unref(task->source);
 
     g_free(task);
@@ -159,6 +163,25 @@ void qio_task_abort(QIOTask *task,
 }
 
 
+void qio_task_set_error(QIOTask *task,
+                        Error *err)
+{
+    error_propagate(&task->err, err);
+}
+
+
+bool qio_task_propagate_error(QIOTask *task,
+                              Error **errp)
+{
+    if (task->err) {
+        error_propagate(errp, task->err);
+        return true;
+    }
+
+    return false;
+}
+
+
 void qio_task_set_result_pointer(QIOTask *task,
                                  gpointer result,
                                  GDestroyNotify destroy)