Apache Module mod_slotmem_shm
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Summary
mod_slotmem_shm is a memory provider which
provides for creation and access to a shared memory segment
in which the datasets are organized in "slots."
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 name
parameter in the create and attach
calls. If not specified with an absolute path, the file will be
created relative to the path specified by the
DefaultRuntimeDir directive.
mod_slotmem_shm provides the following API functions:
- apr_status_t doall(ap_slotmem_instance_t *s, ap_slotmem_callback_fn_t *func, void *data, apr_pool_t *pool)
- call the callback on all worker slots
- 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)
- create a new slotmem with each item size is item_size.
name is used to generate a filename for the persistent store of
the shared memory if configured. Values are:
"none"Anonymous shared memory and no persistent store"file-name"[DefaultRuntimeDir]/file-name"/absolute-file-name"Absolute file name
- 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)
- attach to an existing slotmem. See
create for description of name parameter.
- apr_status_t dptr(ap_slotmem_instance_t *s, unsigned int item_id, void**mem)
- get the direct pointer to the memory associated with this worker slot.
- apr_status_t get(ap_slotmem_instance_t *s, unsigned int item_id, unsigned char *dest, apr_size_t dest_len)
- get/read the memory from this slot to dest
- apr_status_t put(ap_slotmem_instance_t *slot, unsigned int item_id, unsigned char *src, apr_size_t src_len)
- put/write the data from src to this slot
- unsigned int num_slots(ap_slotmem_instance_t *s)
- return the total number of slots in the segment
- apr_size_t slot_size(ap_slotmem_instance_t *s)
- return the total data size, in bytes, of a slot in the segment
- apr_status_t grab(ap_slotmem_instance_t *s, unsigned int *item_id);
- grab or allocate the first free slot and mark as in-use (does not do any data copying)
- apr_status_t fgrab(ap_slotmem_instance_t *s, unsigned int item_id);
- forced grab or allocate the specified slot and mark as in-use (does not do any data copying)
- apr_status_t release(ap_slotmem_instance_t *s, unsigned int item_id);
- release or free a slot and mark as not in-use (does not do any data copying)
Directives
This module provides no
directives.
Bugfix checklist
See also
