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8.2.14 _gfortran_caf_send_by_ref — Sending data from a local image to a remote image with enhanced referencing options


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


void _gfortran_caf_send_by_ref (caf_token_t token, int image_index, gfc_descriptor_t *src, caf_reference_t *refs, int dst_kind, int src_kind, bool may_require_tmp, bool dst_reallocatable, int *stat, int dst_type)

tokenintent(in) An opaque pointer identifying the coarray.
image_indexintent(in) The ID of the remote image; must be a positive number.
srcintent(in) Array descriptor of the local array to be transferred to the remote image
refsintent(in) The references on the remote array to store the data given by src. Guaranteed to have at least one entry.
dst_kindintent(in) Kind of the destination argument
src_kindintent(in) Kind of the source argument
may_require_tmpintent(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_reallocatableintent(in) Set when the destination is of allocatable or pointer type and the refs will allow reallocation, i.e., the ref is a full array or component ref.
statintent(out) When non-NULL give the result of the 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.
dst_typeintent(in) Give the type of the destination. When the destination is not an array, than the precise type, e.g. of a component in a derived type, is not known, but provided here.

It is permitted to have image_index equal the current image; 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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