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...last time the callback would have +been called. This is useful for applying generic freeing actions when +asynchronous commands are retired. + =head2 Callbacks and locking The callbacks are invoked at a point where the libnbd lock is held; as diff --git a/lib/internal.h b/lib/internal.h index 1344d98..ee59582 100644 --- a/lib/internal.h +++ b/lib/internal.h @@ -274,20 +274,20 @@ struct command { }; /* Test if a callback is "null" or not, and set it to null. */ -#define CALLBACK_IS_NULL(cb) ((cb).callback == NULL) +#define CALLBACK_IS_NULL(cb) ((cb).callback == NULL &&a...

This is a combination of these two earlier series: https://www.redhat.com/archives/libguestfs/2019-August/msg00235.html https://www.redhat.com/archives/libguestfs/2019-August/msg00240.html plus changes to allow .callback = NULL / .free != NULL, and to reduce the complexity of freeing callbacks. Although it's rather long there's nothing complex here. We might consider squashing some