68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
#include "refcount.h"
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#include <stdlib.h>
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#include <string.h>
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libab_result libab_ref_new(libab_ref* ref, void* data,
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void (*free_func)(void* data)) {
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libab_result result = LIBAB_SUCCESS;
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ref->strong = 1;
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ref->data = data;
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if ((ref->count = malloc(sizeof(*(ref->count))))) {
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ref->count->strong = ref->count->weak = 1;
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ref->count->free_func = free_func;
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} else {
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result = LIBAB_MALLOC;
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}
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return result;
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}
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static libab_ref_count null_count = {NULL, 0, 1};
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void libab_ref_null(libab_ref* ref) {
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ref->strong = 0;
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ref->data = NULL;
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ref->count = &null_count;
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null_count.weak++;
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}
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void _libab_ref_changed(libab_ref* ref) {
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if (ref->count->strong == 0) {
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ref->count->strong--;
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if (ref->count->free_func) {
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ref->count->free_func(ref->data);
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}
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free(ref->data);
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}
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if (ref->count->weak == 0) {
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free(ref->count);
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}
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}
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void libab_ref_weaken(libab_ref* ref) {
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if (ref->strong) {
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ref->count->strong--;
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ref->strong = 0;
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_libab_ref_changed(ref);
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}
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}
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void libab_ref_free(libab_ref* ref) {
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ref->count->strong -= ref->strong;
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ref->count->weak--;
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_libab_ref_changed(ref);
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}
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void libab_ref_copy(const libab_ref* ref, libab_ref* into) {
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ref->count->strong++;
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ref->count->weak++;
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memcpy(into, ref, sizeof(*ref));
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}
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void* libab_ref_get(const libab_ref* ref) {
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void* to_return = NULL;
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if (ref->count->strong > 0) {
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to_return = ref->data;
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}
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return to_return;
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}
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