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8.2.16 _gfortran_caf_sendget_by_ref — Sending data between remote images using enhanced references on both sides

Description:

Called to send a scalar, an array section or a whole array from a remote image identified by the src_image_index to a remote image identified by the dst_image_index.

Syntax:

void _gfortran_caf_sendget_by_ref (caf_token_t dst_token, int dst_image_index, caf_reference_t *dst_refs, caf_token_t src_token, int src_image_index, caf_reference_t *src_refs, int dst_kind, int src_kind, bool may_require_tmp, int *dst_stat, int *src_stat)

Arguments:
dst_token intent(in) An opaque pointer identifying the destination coarray.
dst_image_index intent(in) The ID of the destination remote image; must be a positive number.
dst_refs intent(in) The references on the remote array to store the data given by the source. Guaranteed to have at least one entry.
src_token intent(in) An opaque pointer identifying the source coarray.
src_image_index intent(in) The ID of the source remote image; must be a positive number.
src_refs intent(in) The references to apply to the remote structure to get the data.
dst_kind intent(in) Kind of the destination argument
src_kind intent(in) Kind of the source argument
may_require_tmp intent(in) The variable is false when it is known at compile time that the dest and src either cannot overlap or overlap (fully or partially) such that walking src and dest in element wise element order (honoring the stride value) will not lead to wrong results. Otherwise, the value is true.
dst_stat intent(out) when non-NULL give the result of the send-operation, i.e., zero on success and non-zero on error. When NULL and an error occurs, then an error message is printed and the program is terminated.
src_stat intent(out) When non-NULL give the result of the get-operation, i.e., zero on success and non-zero on error. When NULL and an error occurs, then an error message is printed and the program is terminated.
NOTES

It is permitted to have the same image index for both src_image_index and dst_image_index; the memory of the send-to and the send-from might (partially) overlap in that case. The implementation has to take care that it handles this case, e.g. using memmove which handles (partially) overlapping memory. If may_require_tmp is true, the library might additionally create a temporary variable, unless additional checks show that this is not required (e.g. because walking backward is possible or because both arrays are contiguous and memmove takes care of overlap issues).

Note that the assignment of a scalar to an array is permitted. In addition, the library has to handle numeric-type conversion and for strings, padding and different character kinds.

Because of the more complicated references possible some operations may be unsupported by certain libraries. The library is expected to issue a precise error message why the operation is not permitted.

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