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promise: update documentation and annotations for NULL replies

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The implementation and tests already handle NULL replies.

Fixes: https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1300
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/502>
This commit is contained in:
Matthew Waters 2020-05-27 20:22:49 +10:00 committed by GStreamer Merge Bot
parent e0bcf24d30
commit 0cccf63fa0
1 changed files with 5 additions and 3 deletions
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8
gst/gstpromise.c
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@ -42,7 +42,9 @@ GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
* A #GstPromise is created with gst_promise_new() by the consumer and passed
* to the producer to avoid thread safety issues with the change callback.
* A #GstPromise can be replied to with a value (or an error) by the producer
* with gst_promise_reply(). gst_promise_interrupt() is for the consumer to
* with gst_promise_reply(). The exact value returned is defined by the API
* contract of the producer and %NULL may be a valid reply.
* gst_promise_interrupt() is for the consumer to
* indicate to the producer that the value is not needed anymore and producing
* that value can stop. The @GST_PROMISE_RESULT_EXPIRED state set by a call
* to gst_promise_expire() indicates to the consumer that a value will never
@ -147,7 +149,7 @@ gst_promise_wait (GstPromise * promise)
/**
* gst_promise_reply:
* @promise: (allow-none): a #GstPromise
* @s: (transfer full): a #GstStructure with the the reply contents
* @s: (transfer full) (nullable): a #GstStructure with the the reply contents
*
* Set a reply on @promise. This will wake up any waiters with
* %GST_PROMISE_RESULT_REPLIED. Called by the producer of the value to
@ -218,7 +220,7 @@ gst_promise_reply (GstPromise * promise, GstStructure * s)
* Retrieve the reply set on @promise. @promise must be in
* %GST_PROMISE_RESULT_REPLIED and the returned structure is owned by @promise
*
* Returns: (transfer none): The reply set on @promise
* Returns: (transfer none) (nullable): The reply set on @promise
*
* Since: 1.14
*/