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| <title>The GNU Fortran Compiler: _gfortran_caf_lock</title> |
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| <a name="g_t_005fgfortran_005fcaf_005flock-_002d_002d_002d-Locking-a-lock-variable"></a> |
| <h4 class="subsection">8.2.10 <code>_gfortran_caf_lock</code> — Locking a lock variable</h4> |
| <a name="index-Coarray_002c-_005fgfortran_005fcaf_005flock"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Acquire a lock on the given image on a scalar locking variable or for the |
| given array element for an array-valued variable. If the <var>aquired_lock</var> |
| is <code>NULL</code>, the function return after having obtained the lock. If it is |
| nonnull, the result is is assigned the value true (one) when the lock could be |
| obtained and false (zero) otherwise. Locking a lock variable which has already |
| been locked by the same image is an error. |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>void _gfortran_caf_lock (caf_token_t token, size_t index, int image_index, |
| int *aquired_lock, int *stat, char *errmsg, int errmsg_len)</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>index</var></td><td width="70%">Array index; first array index is 0. For scalars, it is |
| always 0.</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>aquired_lock</var></td><td width="70%">intent(out) If not NULL, it returns whether lock |
| could be obtained</td></tr> |
| <tr><td width="15%"><var>stat</var></td><td width="70%">intent(out) For allocatable coarrays, stores the STAT=; |
| may be NULL</td></tr> |
| <tr><td width="15%"><var>errmsg</var></td><td width="70%">intent(out) When an error occurs, this will be set to |
| an error message; may be NULL</td></tr> |
| <tr><td width="15%"><var>errmsg_len</var></td><td width="70%">the buffer size of errmsg.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>NOTES</em></dt> |
| <dd><p>This function is also called for critical blocks; for those, the array index |
| is always zero and the image index is one. Libraries are permitted to use other |
| images for critical-block locking variables. |
| </p></dd> |
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