release share-memory auto

[owny990312]

1. When using a publisher to loan a memory block from shared memory via loan(), fill it with data, and publish, I originally manually released the received shared memory on the subscriber side by release() . However, this approach risks prematurely releasing the data when multiple subscribers are present. Is there a way for Iceoryx (iox) to automatically manage memory deallocation through reference counting?

Or, release() only releases the reference to the shared memory. When the reference value is 0, the real memory is released.

2. does iceoryx has Qos or buffer_queue ?

[elBoberido]

Are you using the typed or untyped API. The typed API does the reference counting automatically and with the untyped API it needs to be done manually. Saying that, both API use reference counting but since the untyped API uses raw pointers and not smart pointers, it's up to the user to ensure that the sample is released. When multiple subscriber hold a sample, each one needs to call release (which decrements the refcount) and the sample is only transferred back to the mempool once the refcount is at 0. One has to take care to not release the same sample from the same subscriber multiple times.

iceoryx uses queues, so unless the invariants are not violated, each subscriber can hold the sample for as long as it wants without the memory becoming invalid.

Does this answer your question?