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In order to enable overrun handling through the action API, a few new
features are implemented:
- The RX streamer can now accept stream command actions. The streamer
will interpret stream command actions as a request to send stream
commands upstream to all producers.
- A new action type is defined ('restart request') which is understood
by the radio and streamer, and is a handshake between producers and
consumers. In this case, it will ask the radio to send a stream
command itself.
When an RX streamer receives an overrun, it will now run the following
algorithm:
1. Stop all upstream producers (this was already in the code before this
commit).
2. If no restart is required, Wait for the radios to have space in the
downstream blocks.
The radio, if it was in continuous streaming mode before the overrun,
includes a flag in its initial action whether or not to restart the
streaming. Also, it will wait for the stop stream command from the
streamer. When it receives that, it will initiate a restart request
handshake.
3. The streamer submits a restart request action upstream. This action
will be received by the radio.
The radio will then check the current time, and send a stream command
action back downstream.
4. The RX streamer receives the stream command action, and uses it to
send another stream command to all upstream producers. This way, all
upstream producers receive a start command for the same time.
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Sending actions to self is useful because calling post_action() from
within an action handler will not actually trigger the action. Instead,
it will defer delivery of the action. Allowing sending actions to self
will allow to add another action, in deterministic order, and the
execution of another action handler.
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Implement uhd::rfnoc::rfnoc_graph::enumerate_*_connections()
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This API lets blocks decide if their current topology is OK for them,
and make decisions based on their topology.
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- Added action_info class
- Allow to send actions from node to node
- Allow to post actions into nodes
- Allow to set default forwarding policies
- Added unit tests
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- Adds a detail::graph_t class, which handles the propagation
- Adds methods to node_t to aid with propagation
- Adds unit tests
- Adds dynamic property forwarding:
Nodes are now able to forward properties they don't know about by
providing a forwarding policy. A good example is the FIFO block which
simply forwards most properties verbatim.
- node: Temporarily disabling consistency check at init
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