6.4.5. Miscellaneous Clarifications
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Once an RMA routine completes, it is safe to free any opaque objects passed as argument to that routine. For example, the datatype argument of a MPI_PUT call can be freed as soon as the call returns, even though the communication may not be complete.
As in message passing, datatypes must be committed before they can be used in RMA communication.
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MPI-2.0 of July 18, 1997
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