Wait for @promise to move out of the %GST_PROMISE_RESULT_PENDING state. If @promise is not in %GST_PROMISE_RESULT_PENDING then it will return immediately with the current result.
the result of the promise
1.14
See Implementation
Wait for @promise to move out of the %GST_PROMISE_RESULT_PENDING state. If @promise is not in %GST_PROMISE_RESULT_PENDING then it will return immediately with the current result.