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| author | Quincey Koziol <koziol@koziol.gov> | 2019-06-17 23:19:05 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@koziol.gov> | 2019-06-17 23:19:05 (GMT) |
| commit | 49f14964c373f1206339ab26c684ab4e8b175da6 (patch) | |
| tree | 28b18981997c64933d8be5a25156f5a37a9f8b35 /src/H5Shyper.c | |
| parent | 73331f73dd334f8a0a29eba9ac0025ff31251118 (diff) | |
| download | hdf5-49f14964c373f1206339ab26c684ab4e8b175da6.zip hdf5-49f14964c373f1206339ab26c684ab4e8b175da6.tar.gz hdf5-49f14964c373f1206339ab26c684ab4e8b175da6.tar.bz2 | |
Add H5S_SEL_ITER_SHARE_WITH_DATASPACE selection iterator creation flag, to
share dataspace's selection with iterator (and with caution about not modifying
or closing the dataspace while the iterator is open).
Diffstat (limited to 'src/H5Shyper.c')
| -rw-r--r-- | src/H5Shyper.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/H5Shyper.c b/src/H5Shyper.c index 49d7cb3..6df368d 100644 --- a/src/H5Shyper.c +++ b/src/H5Shyper.c @@ -726,10 +726,17 @@ H5S__hyper_iter_init(const H5S_t *space, H5S_sel_iter_t *iter) else { /* Initialize the information needed for non-regular hyperslab I/O */ H5S_hyper_span_info_t *spans; /* Pointer to hyperslab span info node */ - /* If this iterator is created from an API call, we must clone the + /* If this iterator is created from an API call, by default we clone the * selection now, as the dataspace could be modified or go out of scope. + * + * However, if the H5S_SEL_ITER_SHARE_WITH_DATASPACE flag is given, + * the selection is shared between the selection iterator and the + * dataspace. In this case, the application _must_not_ modify or + * close the dataspace that the iterator is operating on, or undefined + * behavior will occur. */ - if(iter->flags & H5S_SEL_ITER_API_CALL) { + if((iter->flags & H5S_SEL_ITER_API_CALL) && + !(iter->flags & H5S_SEL_ITER_SHARE_WITH_DATASPACE)) { /* Copy the span tree */ if(NULL == (iter->u.hyp.spans = H5S__hyper_copy_span(space->select.sel_info.hslab->span_lst, space->extent.rank))) HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "can't copy span tree") |