129 lines
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129 lines
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<title>mod_slotmem_shm - Apache HTTP Server Version 2.4</title>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.4</p>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_slotmem_shm</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_slotmem_shm.html" title="English"> en </a> |
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<a href="../fr/mod/mod_slotmem_shm.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Slot-based shared memory provider.</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>slotmem_shm_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_slotmem_shm.c</td></tr></table>
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<h3>Summary</h3>
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<p><code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> is a memory provider which
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provides for creation and access to a shared memory segment
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in which the datasets are organized in "slots."
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</p>
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<p>All shared memory is cleared and cleaned with each
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restart, whether graceful or not. The data itself is
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stored and restored within a file noted by the <code>name</code>
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parameter in the <code>create</code> and <code>attach</code>
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calls. If not specified with an absolute path, the file will be
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created relative to the path specified by the
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<code class="directive"><a href="../mod/core.html#defaultruntimedir">DefaultRuntimeDir</a></code> directive.
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</p>
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<p><code class="module"><a href="../mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code> provides the following API functions:
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</p>
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<pre class="prettyprint lang-c">/* call the callback on all worker slots */
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apr_status_t doall(ap_slotmem_instance_t *s, ap_slotmem_callback_fn_t *func, void *data, apr_pool_t *pool)
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/* create a new slotmem with each item size is item_size. 'name' is used to generate a filename for the persistent
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store of the shared memory if configured. Values are:
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"none" - Anonymous shared memory and no persistent store
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"file-name" - [DefaultRuntimeDir]/file-name
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"/absolute-file-name" - Absolute file name */
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apr_status_t create(ap_slotmem_instance_t **new, const char *name, apr_size_t item_size, unsigned int item_num, ap_slotmem_type_t type, apr_pool_t *pool)
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/* attach to an existing slotmem. See 'create()' for description of 'name' parameter */
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apr_status_t attach(ap_slotmem_instance_t **new, const char *name, apr_size_t *item_size, unsigned int *item_num, apr_pool_t *pool)
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/* get the direct pointer to the memory associated with this worker slot */
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apr_status_t dptr(ap_slotmem_instance_t *s, unsigned int item_id, void **mem)
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/* get/read the memory from this slot to dest */
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apr_status_t get(ap_slotmem_instance_t *s, unsigned int item_id, unsigned char *dest, apr_size_t dest_len)
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/* put/write the data from src to this slot */
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apr_status_t put(ap_slotmem_instance_t *slot, unsigned int item_id, unsigned char *src, apr_size_t src_len)
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/* return the total number of slots in the segment */
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unsigned int num_slots(ap_slotmem_instance_t *s)
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/* return the total data size, in bytes, of a slot in the segment */
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apr_size_t slot_size(ap_slotmem_instance_t *s)
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/* grab or allocate the first free slot and mark as in-use (does not do any data copying) */
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apr_status_t grab(ap_slotmem_instance_t *s, unsigned int *item_id)
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/* forced grab or allocate the specified slot and mark as in-use (does not do any data copying) */
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apr_status_t fgrab(ap_slotmem_instance_t *s, unsigned int item_id)
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/* release or free a slot and mark as not in-use (does not do any data copying) */
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apr_status_t release(ap_slotmem_instance_t *s, unsigned int item_id)</pre>
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</div>
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<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
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<p>This module provides no
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directives.</p>
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<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_slotmem_shm">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_slotmem_shm">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="#comments_section">Comments</a></li></ul></div>
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<p><span>Available Languages: </span><a href="../en/mod/mod_slotmem_shm.html" title="English"> en </a> |
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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