04.11.2014 18:18, Dimitry Sibiryakov wrote:
>
> Could someone explain meaning of each of the values?
>
> enum req_s {
> req_evaluate,
> req_return,
> req_receive,
> req_send,
> req_proceed,
> req_sync,
> req_unwind
> };
req_evaluate - execute the node inside the main execution flow
req_return - node execution is finished and execution flow should be
redirected back to the parent node (to continue with the next node)
req_unwind - custom exception handling for the node, without an
exception handler it forces the whole execution tree to exit (i.e. node
-> parent -> parent -> ... -> out)
req_send / req_receive - handle in/out messages, IIRC they're mostly
bound to nod_send / nod_receive nodes
req_proceed - initial state to execute the request, also used together
with req_sync to implement SUSPEND (nod_stall)
Most of the new nodes need only evaluate / return / unwind to be
implemented. I don't remember us ever touching other request states.
Dmitry
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