Apache: Модуль Apache mod_slotmem

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Пункт 194. Apache Module mod_slotmem_plain

Description:	Slot-based shared memory provider.
Status:	Extension
Module Identifier:	slotmem_plain_module
Source File:	mod_slotmem_plain.c

Summary

mod_slotmem_plain is a memory provider which provides for creation and access to a plain memory segment in which the datasets are organized in "slots."

If the memory needs to be shared between threads and processes, a better provider would be mod_slotmem_shm .

mod_slotmem_plain 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.
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.
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)