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| <a name="ATOMIC_005fREF-_002d_002d_002d-Obtaining-the-value-of-a-variable-atomically"></a> |
| <h3 class="section">8.25 <code>ATOMIC_REF</code> — Obtaining the value of a variable atomically</h3> |
| <a name="index-ATOMIC_005fREF"></a> |
| <a name="index-Atomic-subroutine_002c-reference"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ATOMIC_DEFINE(ATOM, VALUE)</code> atomically assigns the value of the |
| variable <var>ATOM</var> to <var>VALUE</var>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2008 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Atomic subroutine |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>CALL ATOMIC_REF(VALUE, ATOM)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>VALURE</var></td><td width="70%">Scalar and of the same type as <var>ATOM</var>. If the kind |
| is different, the value is converted to the kind of |
| <var>ATOM</var>.</td></tr> |
| <tr><td width="15%"><var>ATOM</var></td><td width="70%">Scalar coarray or coindexed variable of either integer |
| type with <code>ATOMIC_INT_KIND</code> kind or logical type |
| with <code>ATOMIC_LOGICAL_KIND</code> kind.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program atomic |
| use iso_fortran_env |
| logical(atomic_logical_kind) :: atom[*] |
| logical :: val |
| call atomic_ref (atom, .false.) |
| ! ... |
| call atomic_ref (atom, val) |
| if (val) then |
| print *, "Obtained" |
| end if |
| end program atomic |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="ATOMIC_005fDEFINE.html#ATOMIC_005fDEFINE">ATOMIC_DEFINE</a>, <a href="ISO_005fFORTRAN_005fENV.html#ISO_005fFORTRAN_005fENV">ISO_FORTRAN_ENV</a> |
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