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ch4/isend-irecv: add parent reques completion in isend/irecv #6640

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ch4/isend-irecv: add parent reques completion in isend/irecv #6640

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Commits on Aug 17, 2023

  1. ch4/isend-irecv: add a parent completion pointer for nested request 

    adds support for meta request (parent request relying on the completion of
subrequest) in the Isend/Irecv path.

A parent request is becoming a used pattern (continuation, partitioned
communication). Here we add a completion mechanism to the isend/irecv
path to notify the parent request of completion of one of the child
request.
    @thomasgillis
    thomasgillis committed Aug 17, 2023
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  2. ch4/isend-irecv: add an isend_parent and irecv_parent function 

    The parent function are similar to the MPID_Isend/Irecv function except
that they have a completion counter pointer as an additional argument.

Those functions are needed by the partitioned communications to track
progress of children requests
    @thomasgillis
    thomasgillis committed Aug 17, 2023
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