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| <title>The GNU Fortran Compiler: ATOMIC_FETCH_ADD</title> |
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| <a name="ATOMIC_005fFETCH_005fADD-_002d_002d_002d-Atomic-ADD-operation-with-prior-fetch"></a> |
| <h3 class="section">9.28 <code>ATOMIC_FETCH_ADD</code> — Atomic ADD operation with prior fetch</h3> |
| <a name="index-ATOMIC_005fFETCH_005fADD"></a> |
| <a name="index-Atomic-subroutine_002c-ADD-with-fetch"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ATOMIC_FETCH_ADD(ATOM, VALUE, OLD)</code> atomically stores the value of |
| <var>ATOM</var> in <var>OLD</var> and adds the value of <var>VAR</var> to the |
| variable <var>ATOM</var>. When <var>STAT</var> is present and the invokation was |
| successful, it is assigned the value 0. If it is present and the invokation |
| has failed, it is assigned a positive value; in particular, for a coindexed |
| <var>ATOM</var>, if the remote image has stopped, it is assigned the value of |
| <code>ISO_FORTRAN_ENV</code>’s <code>STAT_STOPPED_IMAGE</code> and if the remote image has |
| failed, the value <code>STAT_FAILED_IMAGE</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>TS 18508 or later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Atomic subroutine |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>CALL ATOMIC_FETCH_ADD (ATOM, VALUE, old [, STAT])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>ATOM</var></td><td width="70%">Scalar coarray or coindexed variable of integer |
| type with <code>ATOMIC_INT_KIND</code> kind. |
| <code>ATOMIC_LOGICAL_KIND</code> kind.</td></tr> |
| <tr><td width="15%"><var>VALUE</var></td><td width="70%">Scalar 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>OLD</var></td><td width="70%">Scalar of the same type and kind as <var>ATOM</var>.</td></tr> |
| <tr><td width="15%"><var>STAT</var></td><td width="70%">(optional) Scalar default-kind integer variable.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program atomic |
| use iso_fortran_env |
| integer(atomic_int_kind) :: atom[*], old |
| call atomic_add (atom[1], this_image(), old) |
| 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="ATOMIC_005fADD.html#ATOMIC_005fADD">ATOMIC_ADD</a>, <a href="ISO_005fFORTRAN_005fENV.html#ISO_005fFORTRAN_005fENV">ISO_FORTRAN_ENV</a>, |
| <a href="ATOMIC_005fFETCH_005fAND.html#ATOMIC_005fFETCH_005fAND">ATOMIC_FETCH_AND</a>, <a href="ATOMIC_005fFETCH_005fOR.html#ATOMIC_005fFETCH_005fOR">ATOMIC_FETCH_OR</a>, <a href="ATOMIC_005fFETCH_005fXOR.html#ATOMIC_005fFETCH_005fXOR">ATOMIC_FETCH_XOR</a> |
| </p></dd> |
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