2.4.x/docs/manual/mod/mod_slotmem_plain.xml

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<modulesynopsis metafile="mod_slotmem_plain.xml.meta">

<name>mod_slotmem_plain</name>
<description>Slot-based shared memory provider.</description>
<status>Extension</status>
<sourcefile>mod_slotmem_plain.c</sourcefile>
<identifier>slotmem_plain_module</identifier>

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

    <p>If the memory needs to be shared between threads and
    processes, a better provider would be
    <module>mod_slotmem_shm</module>.
    </p>

    <p><code>mod_slotmem_plain</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.</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.</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 the first free slot and mark as in-use (does not do any data copying)</dd>

      <dt>apr_status_t fgrab(ap_slotmem_instance_t *s, unsigned int item_id);</dt>
      <dd>forced grab or allocate the specified 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>

</summary>

</modulesynopsis>