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| <title>The GNU Fortran Compiler: _gfortran_caf_sendget</title> |
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| <a name="g_t_005fgfortran_005fcaf_005fsendget-_002d_002d_002d-Sending-data-between-remote-images"></a> |
| <h4 class="subsection">8.2.9 <code>_gfortran_caf_sendget</code> — Sending data between remote images</h4> |
| <a name="index-Coarray_002c-_005fgfortran_005fcaf_005fsendget"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Called to send a scalar, an array section or whole array from a remote image |
| identified by the src_image_index to a remote image identified by the |
| dst_image_index. |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>void _gfortran_caf_sendget (caf_token_t dst_token, size_t dst_offset, |
| int dst_image_index, gfc_descriptor_t *dest, caf_vector_t *dst_vector, |
| caf_token_t src_token, size_t src_offset, int src_image_index, |
| gfc_descriptor_t *src, caf_vector_t *src_vector, int dst_kind, int src_kind, |
| bool may_require_tmp)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>dst_token</var></td><td width="70%">intent(in) An opaque pointer identifying the |
| destination coarray.</td></tr> |
| <tr><td width="15%"><var>dst_offset</var></td><td width="70%">By which amount of bytes the actual data is |
| shifted compared to the base address of the destination coarray.</td></tr> |
| <tr><td width="15%"><var>dst_image_index</var></td><td width="70%">The ID of the destination remote image; must |
| be a positive number.</td></tr> |
| <tr><td width="15%"><var>dest</var></td><td width="70%">intent(in) Array descriptor for the destination |
| remote image for the bounds and the size. The base_addr shall not be accessed.</td></tr> |
| <tr><td width="15%"><var>dst_vector</var></td><td width="70%">intent(int) If not NULL, it contains the vector |
| subscript of the destination array; the values are relative to the dimension |
| triplet of the dest argument.</td></tr> |
| <tr><td width="15%"><var>src_token</var></td><td width="70%">An opaque pointer identifying the source coarray.</td></tr> |
| <tr><td width="15%"><var>src_offset</var></td><td width="70%">By which amount of bytes the actual data is shifted |
| compared to the base address of the source coarray.</td></tr> |
| <tr><td width="15%"><var>src_image_index</var></td><td width="70%">The ID of the source remote image; must be a |
| positive number.</td></tr> |
| <tr><td width="15%"><var>src</var></td><td width="70%">intent(in) Array descriptor of the local array to be |
| transferred to the remote image.</td></tr> |
| <tr><td width="15%"><var>src_vector</var></td><td width="70%">intent(in) Array descriptor of the local array to |
| be transferred to the remote image</td></tr> |
| <tr><td width="15%"><var>dst_kind</var></td><td width="70%">Kind of the destination argument</td></tr> |
| <tr><td width="15%"><var>src_kind</var></td><td width="70%">Kind of the source argument</td></tr> |
| <tr><td width="15%"><var>may_require_tmp</var></td><td width="70%">The variable is false it is known at compile |
| time that the <var>dest</var> and <var>src</var> either cannot overlap or overlap (fully |
| or partially) such that walking <var>src</var> and <var>dest</var> in element wise |
| element order (honoring the stride value) will not lead to wrong results. |
| Otherwise, the value is true.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>NOTES</em></dt> |
| <dd><p>It is permitted to have image_ids equal; 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 <code>memmove</code> which handles |
| (partially) overlapping memory. If <var>may_require_tmp</var> 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 <code>memmove</code> takes care of overlap issues). |
| </p> |
| <p>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. |
| </p></dd> |
| </dl> |
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