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<title>mod_slotmem_shm - Apache HTTP Server Version 2.4</title>
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Modules | Directives | FAQ | Glossary | Sitemap
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Apache HTTP Server Version 2.4
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<-
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Apache > HTTP Server > Documentation > Version 2.4 > Modules
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Apache Module mod_slotmem_shm
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Available Languages:  en  |
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 fr 
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Description:Slot-based shared memory provider.
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Status:Extension
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Module Identifier:slotmem_shm_module
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Source File:mod_slotmem_shm.c
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Summary
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mod_slotmem_shm 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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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 name
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    parameter in the create and attach
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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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    DefaultRuntimeDir directive.
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mod_slotmem_shm provides the following API functions:
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/* 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)
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Support Apache!
Directives
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This module provides no
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            directives.
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Bugfix checklist
See also
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