示例#1
0
void CharSetContainer::unloadCollation(thread_db* tdbb, USHORT tt_id)
{
	const USHORT id = TTYPE_TO_COLLATION(tt_id);
	fb_assert(id != 0);

	if (id < charset_collations.getCount() && charset_collations[id] != NULL)
	{
		if (charset_collations[id]->useCount != 0)
		{
			ERR_post(Arg::Gds(isc_no_meta_update) <<
					 Arg::Gds(isc_obj_in_use) << Arg::Str(charset_collations[id]->name));
		}

		fb_assert(charset_collations[id]->existenceLock);

		if (!charset_collations[id]->obsolete)
		{
			LCK_convert(tdbb, charset_collations[id]->existenceLock, LCK_EX, LCK_WAIT);
			charset_collations[id]->obsolete = true;
			LCK_release(tdbb, charset_collations[id]->existenceLock);
		}
	}
	else
	{
		// signal other processes collation is gone
		Lock* lock = CharSetContainer::createCollationLock(tdbb, tt_id);

		LCK_lock(tdbb, lock, LCK_EX, LCK_WAIT);
		LCK_release(tdbb, lock);

		delete lock;
	}
}
示例#2
0
Collation* CharSetContainer::lookupCollation(thread_db* tdbb, USHORT tt_id)
{
	const USHORT id = TTYPE_TO_COLLATION(tt_id);

	if (id < charset_collations.getCount() && charset_collations[id] != NULL)
	{
		if (!charset_collations[id]->obsolete)
			return charset_collations[id];
	}

	Jrd::Attachment* att = tdbb->getAttachment();
	Jrd::Attachment::CheckoutLockGuard guard(att, createCollationMtx, FB_FUNCTION); // do we need it ?

	Collation* to_delete = NULL;

	if (id < charset_collations.getCount() && charset_collations[id] != NULL)
	{
		if (charset_collations[id]->obsolete)
		{
			// if obsolete collation is not used delete it immediately,
			// else wait until all references are released
			if (charset_collations[id]->useCount == 0)
			{
				charset_collations[id]->destroy(tdbb);
				delete charset_collations[id];
			}
			else
				to_delete = charset_collations[id];

			charset_collations[id] = NULL;
		}
		else
			return charset_collations[id];
	}

	SubtypeInfo info;
	if (MET_get_char_coll_subtype_info(tdbb, tt_id, &info))
	{
		CharSet* charset = INTL_charset_lookup(tdbb, TTYPE_TO_CHARSET(tt_id));

		if (TTYPE_TO_CHARSET(tt_id) != CS_METADATA)
		{
			Firebird::UCharBuffer specificAttributes;
			ULONG size = info.specificAttributes.getCount() * charset->maxBytesPerChar();

			size = INTL_convert_bytes(tdbb, TTYPE_TO_CHARSET(tt_id),
									  specificAttributes.getBuffer(size), size,
									  CS_METADATA, info.specificAttributes.begin(),
									  info.specificAttributes.getCount(), ERR_post);
			specificAttributes.shrink(size);
			info.specificAttributes = specificAttributes;
		}

		texttype* tt = FB_NEW_POOL(*att->att_pool) texttype;
		memset(tt, 0, sizeof(texttype));

		if (!lookup_texttype(tt, &info))
		{
			delete tt;
			ERR_post(Arg::Gds(isc_collation_not_installed) << Arg::Str(info.collationName) <<
															  Arg::Str(info.charsetName));
		}

		if (charset_collations.getCount() <= id)
			charset_collations.grow(id + 1);

		fb_assert((tt->texttype_canonical_width == 0 && tt->texttype_fn_canonical == NULL) ||
				  (tt->texttype_canonical_width != 0 && tt->texttype_fn_canonical != NULL));

		if (tt->texttype_canonical_width == 0)
		{
			if (charset->isMultiByte())
				tt->texttype_canonical_width = sizeof(ULONG);	// UTF-32
			else
			{
				tt->texttype_canonical_width = charset->minBytesPerChar();
				// canonical is equal to string, then TEXTTYPE_DIRECT_MATCH can be turned on
				tt->texttype_flags |= TEXTTYPE_DIRECT_MATCH;
			}
		}

		charset_collations[id] = Collation::createInstance(*att->att_pool, tt_id, tt, charset);
		charset_collations[id]->name = info.collationName;

		// we don't need a lock in the charset
		if (id != 0)
		{
			Lock* lock = charset_collations[id]->existenceLock =
				CharSetContainer::createCollationLock(tdbb, tt_id, charset_collations[id]);

			fb_assert(charset_collations[id]->useCount == 0);
			fb_assert(!charset_collations[id]->obsolete);

			LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT);

			// as we just obtained SR lock for new collation instance
			// we could safely delete obsolete instance
			if (to_delete)
			{
				to_delete->destroy(tdbb);
				delete to_delete;
			}
		}
	}
	else
	{
		if (to_delete)
		{
			LCK_lock(tdbb, to_delete->existenceLock, LCK_SR, LCK_WAIT);
			to_delete->destroy(tdbb);
			delete to_delete;
		}

		ERR_post(Arg::Gds(isc_text_subtype) << Arg::Num(tt_id));
	}

	return charset_collations[id];
}