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Diffstat (limited to '')
-rw-r--r-- | src/lib/memarea.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/lib/memarea.h b/src/lib/memarea.h new file mode 100644 index 0000000..9c546df --- /dev/null +++ b/src/lib/memarea.h @@ -0,0 +1,31 @@ +#ifndef MEMAREA_H +#define MEMAREA_H + +typedef void memarea_free_callback_t(void *context); + +/* Create reference counted memory area. The callback is called when the + refcount drops to 0. */ +struct memarea * +memarea_init(const void *data, size_t size, + memarea_free_callback_t *callback, void *context); +#define memarea_init(data, size, callback, context) \ + memarea_init(data, size - \ + CALLBACK_TYPECHECK(callback, void (*)(typeof(context))), \ + (memarea_free_callback_t *)callback, context) +/* Returns an empty memory area. */ +struct memarea *memarea_init_empty(void); + +void memarea_ref(struct memarea *area); +void memarea_unref(struct memarea **area); +/* Free the memory area without calling the callback. + This is allowed only when refcount==1. */ +void memarea_free_without_callback(struct memarea **area); + +unsigned int memarea_get_refcount(struct memarea *area); +const void *memarea_get(struct memarea *area, size_t *size_r); +size_t memarea_get_size(struct memarea *area); + +/* free-callback that does nothing */ +void memarea_free_callback_noop(void *context); + +#endif |