handling of invalid Fortran handles. Per MPI-2:4.12.4, if we get an
invalid Fortran handle, we should return an invalid C handle. Before
this commit, we checked if the fortran handle index was out of range
(i.e., <0 or >sizeof(array)). If so, we used to return MPI_*_NULL
(i.e., a valid C handle). But to be faithful to MPI-2:4.12.4, we
now return NULL (an invalid C handle).
If the fortran index is in bounds but is an index for an MPI object
that has already been freed, the code already returns NULL because the
entry in the array will be NULL (i.e., we already did what
MPI-2:4.12.4 said for this case).
Hence, this commit makes the handling of invalid fortran handles in
the MPI_*_F2C functions be uniform: we always return NULL.
Commit 2 of this will be to edit just about every C interface function
(!) to ensure that MPI handles are not NULL. Otherwise, if the user
calls a fortran interface function with an invalid handle, the fortran
interface function will call MPI_*_F2C and blindly pass the result to
the back-end C function. The C function will eventually end up trying
to dereference it -- segv. Having a run-time check for NULL and
invoking an MPI exception is far more social (e.g., the user can get a
stack trace out of MPI_ABORT) and consistent (i.e., we're already
checking for MPI_*_NULL in the C interface functions).
Since all the C interface functions have all the machinery for
run-time parameter checking, and they all already check for
MPI_*_NULL, it's easy enough to add another check for NULL.
This commit was SVN r9560.
- move files out of toplevel include/ and etc/, moving it into the
sub-projects
- rather than including config headers with <project>/include,
have them as <project>
- require all headers to be included with a project prefix, with
the exception of the config headers ({opal,orte,ompi}_config.h
mpi.h, and mpif.h)
This commit was SVN r8985.
