Exemplos de heap_put_partial em C++ (Cpp)

Exemplo n.º 1

Arquivo: lock-free-alloc.c Projeto: Alkarex/mono

static gpointer
alloc_from_active_or_partial (MonoLockFreeAllocator *heap)
{
	Descriptor *desc;
	Anchor old_anchor, new_anchor;
	gpointer addr;

 retry:
	desc = heap->active;
	if (desc) {
		if (InterlockedCompareExchangePointer ((gpointer * volatile)&heap->active, NULL, desc) != desc)
			goto retry;
	} else {
		desc = heap_get_partial (heap);
		if (!desc)
			return NULL;
	}

	/* Now we own the desc. */

	do {
		unsigned int next;

		new_anchor = old_anchor = (Anchor)*(volatile gint32*)&desc->anchor.value;
		if (old_anchor.data.state == STATE_EMPTY) {
			/* We must free it because we own it. */
			desc_retire (desc);
			goto retry;
		}
		g_assert (old_anchor.data.state == STATE_PARTIAL);
		g_assert (old_anchor.data.count > 0);

		addr = (char*)desc->sb + old_anchor.data.avail * desc->slot_size;

		mono_memory_read_barrier ();

		next = *(unsigned int*)addr;
		g_assert (next < SB_USABLE_SIZE / desc->slot_size);

		new_anchor.data.avail = next;
		--new_anchor.data.count;

		if (new_anchor.data.count == 0)
			new_anchor.data.state = STATE_FULL;
	} while (!set_anchor (desc, old_anchor, new_anchor));

	/* If the desc is partial we have to give it back. */
	if (new_anchor.data.state == STATE_PARTIAL) {
		if (InterlockedCompareExchangePointer ((gpointer * volatile)&heap->active, desc, NULL) != NULL)
			heap_put_partial (desc);
	}

	return addr;
}

Exemplo n.º 2

Arquivo: lock-free-alloc.c Projeto: AphasiaRepo/mono

void
mono_lock_free_free (gpointer ptr, size_t block_size)
{
	Anchor old_anchor, new_anchor;
	Descriptor *desc;
	gpointer sb;
	MonoLockFreeAllocator *heap = NULL;

	desc = *(Descriptor**) sb_header_for_addr (ptr, block_size);
	g_assert (block_size == desc->block_size);

	sb = desc->sb;

	do {
		new_anchor = old_anchor = *(volatile Anchor*)&desc->anchor.value;
		*(unsigned int*)ptr = old_anchor.data.avail;
		new_anchor.data.avail = ((char*)ptr - (char*)sb) / desc->slot_size;
		g_assert (new_anchor.data.avail < LOCK_FREE_ALLOC_SB_USABLE_SIZE (block_size) / desc->slot_size);

		if (old_anchor.data.state == STATE_FULL)
			new_anchor.data.state = STATE_PARTIAL;

		if (++new_anchor.data.count == desc->max_count) {
			heap = desc->heap;
			new_anchor.data.state = STATE_EMPTY;
		}
	} while (!set_anchor (desc, old_anchor, new_anchor));

	if (new_anchor.data.state == STATE_EMPTY) {
		g_assert (old_anchor.data.state != STATE_EMPTY);

		if (InterlockedCompareExchangePointer ((gpointer * volatile)&heap->active, NULL, desc) == desc) {
			/* We own it, so we free it. */
			desc_retire (desc);
		} else {
			/*
			 * Somebody else must free it, so we do some
			 * freeing for others.
			 */
			list_remove_empty_desc (heap->sc);
		}
	} else if (old_anchor.data.state == STATE_FULL) {
		/*
		 * Nobody owned it, now we do, so we need to give it
		 * back.
		 */

		g_assert (new_anchor.data.state == STATE_PARTIAL);

		if (InterlockedCompareExchangePointer ((gpointer * volatile)&desc->heap->active, desc, NULL) != NULL)
			heap_put_partial (desc);
	}
}