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| <h4 class="subsection">8.2.19 <code>_gfortran_caf_atomic_cas</code> — Atomic compare and swap</h4> |
| <a name="index-Coarray_002c-_005fgfortran_005fcaf_005fatomic_005fcas"></a> |
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| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Atomic compare and swap of a kind-4 integer or logical variable. Assigns |
| atomically the specified value to the atomic variable, if the latter has |
| the value specified by the passed condition value. |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>void _gfortran_caf_atomic_cas (caf_token_t token, size_t offset, |
| int image_index, void *old, void *compare, void *new_val, int *stat, |
| int type, int kind)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>token</var></td><td width="70%">intent(in) An opaque pointer identifying the coarray.</td></tr> |
| <tr><td width="15%"><var>offset</var></td><td width="70%">By which amount of bytes the actual data is shifted |
| compared to the base address of the coarray.</td></tr> |
| <tr><td width="15%"><var>image_index</var></td><td width="70%">The ID of the remote image; must be a positive |
| number.</td></tr> |
| <tr><td width="15%"><var>old</var></td><td width="70%">intent(out) the value which the atomic variable had |
| just before the cas operation.</td></tr> |
| <tr><td width="15%"><var>compare</var></td><td width="70%">intent(in) The value used for comparision.</td></tr> |
| <tr><td width="15%"><var>new_val</var></td><td width="70%">intent(in) The new value for the atomic variable, |
| assigned to the atomic variable, if <code>compare</code> equals the value of the |
| atomic variable.</td></tr> |
| <tr><td width="15%"><var>stat</var></td><td width="70%">intent(out) Stores the status STAT= and may be NULL.</td></tr> |
| <tr><td width="15%"><var>type</var></td><td width="70%">the data type, i.e. <code>BT_INTEGER</code> (1) or |
| <code>BT_LOGICAL</code> (2).</td></tr> |
| <tr><td width="15%"><var>kind</var></td><td width="70%">The kind value (only 4; always <code>int</code>)</td></tr> |
| </table> |
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