(Embedded
image moved wcs @ nsgi3.lbl.gov
to file: 06/20/97 06:53 PM
PIC30914.PCX)
To: snir @ watson.ibm.com, linda @ k2.llnl.gov
cc: Mpi-Core @ mcs.anl.gov (bcc: Marc Snir/Watson/IBM Research)
Subject: Re: revised question
Code examples are a nice way to explain this, for handles.
In the following, a and b are handles. a has been initialized
to a valid handle, and b has not been initialized.
b = a
MPI_xxx(a)
If the argument to MPI_xxx is IN, then b is valid afterwards
If the argument to MPI_xxx is OUT or INOUT, then b may no longer
be a valid handle.
*********
Even if the call to MPI_xxx(a) does not change the handle, so that
MPI_xxx(b) can be safely invoked afterward, the argument may still be
labeled INOUT, if it
modifies the opaque object accessed by a. This is how we choose in MPI1 to
use IN, OUT and INOUT for language independent bindings -- probably to fit
some existing Posix standard on language independent bindings.
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