src/pmc/addrregistry.pmc - A DOD Registry PMC


The AddrRegistry class provides the equivalence of reference counts mainly for extenders and embeders of Parrot. The hash keys are the addressed of the key PMC, values are reference counts, i.e. the difference of (set_pmc_keyed - delete_pmc_keyed). If the reference goes to zero, the entry is deleted physically.

Please not that you have to anchor an instance of AddrRegistry yourself e.g. with Parrot_register_pmc if it isn't visible to Parrot.

Functions ^

void init()

Initializes the instance.

void destroy()

Free hash structure.

void mark()

Marks the hash as live.

INTVAL get_integer_keyed(PMC *key)

Returns the reference count for key or 0, if the key doesn't exist.

INTVAL elements()

Returns the number of elements in the hash.

INTVAL get_bool()

Returns true if the hash size is not zero.

void set_pmc_keyed(PMC *key, PMC *value)

Increment the reference count of key. If the entry doesn't exist create it. The value is always ignored.

void delete_keyed(PMC *key)

Decrement the reference count of key. If the reference count reaches 0, delete the entry.

PMC *get_iter ()

Return a new iterator for the PMC.

PMC *get_pmc_keyed(PMC *key)

If called from iteration, return the key PMC, else PMCNULL is returned.