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<div id="preamble"><h1>Apache Module mod_slotmem_shm</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_slotmem_shm.html" title="English">&nbsp;en&nbsp;</a></p>
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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>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mod_slotmem_shm_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_slotmem_shm.c</td></tr></table>
<h3>Summary</h3>

    <p><code>mod_slotmem_shm</code> is a memory provider which
    provides for creation and access to a shared memory segment
    in which the datasets are organized in "slots."
    </p>

    <p>All shared memory is cleared and cleaned with each
    restart, whether graceful or not. The data itself is
    stored and restored within a file noted by the <code>name</code>
    parameter in the <code>create</code> and <code>attach</code>
    calls.
    </p>

    <p><code>mod_slotmem_shm</code> provides the following API functions:
    </p>

    <dl>
      <dt>apr_status_t doall(ap_slotmem_instance_t *s, ap_slotmem_callback_fn_t *func, void *data, apr_pool_t *pool)</dt>
      <dd>call the callback on all worker slots</dd>

      <dt>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)</dt>
      <dd>create a new slotmem with each item size is item_size. <code>name</code> is the filename for the persistent store of
      the shared memory. Values are:
       <dl>
         <dt><code>"none"</code></dt>
         <dd><code>Does not persist shared memory in file.</code></dd>
         <dt><code>"anonymous"</code></dt>
         <dd><code>$server_root/logs/anonymous.slotmem</code></dd>
         <dt><code>":file-name"</code></dt>
         <dd><code>$server_root/logs/file-name.slotmem</code></dd>
         <dt><code>"absolute-file-name"</code></dt>
         <dd><code>$absolute-file-name.slotmem</code></dd>
       </dl></dd>

      <dt>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)</dt>
      <dd>attach to an existing slotmem. See <code>create</code> for description of <code>name</code> parameter.</dd>

      <dt>apr_status_t dptr(ap_slotmem_instance_t *s, unsigned int item_id, void**mem)</dt>
      <dd>get the direct pointer to the memory associated with this worker slot.</dd>

      <dt>apr_status_t get(ap_slotmem_instance_t *s, unsigned int item_id, unsigned char *dest, apr_size_t dest_len)</dt>
      <dd>get/read the memory from this slot to dest</dd>

      <dt>apr_status_t put(ap_slotmem_instance_t *slot, unsigned int item_id, unsigned char *src, apr_size_t src_len)</dt>
      <dd>put/write the data from src to this slot</dd>

      <dt>unsigned int num_slots(ap_slotmem_instance_t *s)</dt>
      <dd>return the total number of slots in the segment</dd>

      <dt>apr_size_t slot_size(ap_slotmem_instance_t *s)</dt>
      <dd>return the total data size, in bytes, of a slot in the segment</dd>

      <dt>apr_status_t grab(ap_slotmem_instance_t *s, unsigned int item_id);</dt>
      <dd>grab or allocate a slot and mark as in-use (does not do any data copying)</dd>

      <dt>apr_status_t release(ap_slotmem_instance_t *s, unsigned int item_id);</dt>
      <dd>release or free a slot and mark as not in-use (does not do any data copying)</dd>
    </dl>

</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
            directives.</p>
</div>

</div>
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<p class="apache">Copyright 2011 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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