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10 <title>mod_slotmem_shm - Apache HTTP Server Version 2.5</title>
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27 <div id="preamble"><h1>Apache Module mod_slotmem_shm</h1>
29 <p><span>Available Languages: </span><a href="../en/mod/mod_slotmem_shm.html" title="English"> en </a></p>
31 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Slot-based shared memory provider.</td></tr>
32 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
33 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>slotmem_shm_module</td></tr>
34 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_slotmem_shm.c</td></tr></table>
37 <p><code>mod_slotmem_shm</code> is a memory provider which
38 provides for creation and access to a shared memory segment
39 in which the datasets are organized in "slots."
42 <p>All shared memory is cleared and cleaned with each
43 restart, whether graceful or not. The data itself is
44 stored and restored within a file noted by the <code>name</code>
45 parameter in the <code>create</code> and <code>attach</code>
46 calls. If not specified with an absolute path, the file will be
47 created relative to the path specified by the
48 <code class="directive"><a href="../mod/core.html#defaultruntimedir">DefaultRuntimeDir</a></code> directive.
51 <p><code>mod_slotmem_shm</code> provides the following API functions:
55 <dt>apr_status_t doall(ap_slotmem_instance_t *s, ap_slotmem_callback_fn_t *func, void *data, apr_pool_t *pool)</dt>
56 <dd>call the callback on all worker slots</dd>
58 <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>
59 <dd>create a new slotmem with each item size is item_size. <code>name</code> is used to generate a filename for the persistent store of
60 the shared memory if configured. Values are:
62 <dt><code>"none"</code></dt>
63 <dd><code>Anonymous shared memory and no persistent store</code></dd>
64 <dt><code>"file-name"</code></dt>
65 <dd><code>[DefaultRuntimeDir]/file-name</code></dd>
66 <dt><code>"/absolute-file-name"</code></dt>
67 <dd><code>Absolute file name</code></dd>
70 <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>
71 <dd>attach to an existing slotmem. See <code>create</code> for description of <code>name</code> parameter.</dd>
73 <dt>apr_status_t dptr(ap_slotmem_instance_t *s, unsigned int item_id, void**mem)</dt>
74 <dd>get the direct pointer to the memory associated with this worker slot.</dd>
76 <dt>apr_status_t get(ap_slotmem_instance_t *s, unsigned int item_id, unsigned char *dest, apr_size_t dest_len)</dt>
77 <dd>get/read the memory from this slot to dest</dd>
79 <dt>apr_status_t put(ap_slotmem_instance_t *slot, unsigned int item_id, unsigned char *src, apr_size_t src_len)</dt>
80 <dd>put/write the data from src to this slot</dd>
82 <dt>unsigned int num_slots(ap_slotmem_instance_t *s)</dt>
83 <dd>return the total number of slots in the segment</dd>
85 <dt>apr_size_t slot_size(ap_slotmem_instance_t *s)</dt>
86 <dd>return the total data size, in bytes, of a slot in the segment</dd>
88 <dt>apr_status_t grab(ap_slotmem_instance_t *s, unsigned int *item_id);</dt>
89 <dd>grab or allocate the first free slot and mark as in-use (does not do any data copying)</dd>
91 <dt>apr_status_t fgrab(ap_slotmem_instance_t *s, unsigned int item_id);</dt>
92 <dd>forced grab or allocate the specified slot and mark as in-use (does not do any data copying)</dd>
94 <dt>apr_status_t release(ap_slotmem_instance_t *s, unsigned int item_id);</dt>
95 <dd>release or free a slot and mark as not in-use (does not do any data copying)</dd>
99 <div id="quickview"><h3 class="directives">Directives</h3>
100 <p>This module provides no
102 <ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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106 <p><span>Available Languages: </span><a href="../en/mod/mod_slotmem_shm.html" title="English"> en </a></p>
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