Apache Module mod_slotmem_plain

Description:	Slot-based shared memory provider.
Status:	Extension
ModuleIdentifier:	slotmem_plain_module
SourceFile:	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)