Function PrepareInvalidationState

src/backend/utils/cache/inval.c:817–840

* PrepareInvalidationState * Initialize inval lists for the current (sub)transaction. */

 *		Initialize inval lists for the current (sub)transaction.
 */
static void
PrepareInvalidationState(void)
{
	TransInvalidationInfo *myInfo;

	if (transInvalInfo != NULL &&
		transInvalInfo->my_level == GetCurrentTransactionNestLevel())
		return;

	myInfo = (TransInvalidationInfo *)
		MemoryContextAllocZero(TopTransactionContext,
							   sizeof(TransInvalidationInfo));
	myInfo->parent = transInvalInfo;
	myInfo->my_level = GetCurrentTransactionNestLevel();

	/*
	 * If there's any previous entry, this one should be for a deeper nesting
	 * level.
	 */
	Assert(transInvalInfo == NULL ||
		   myInfo->my_level > transInvalInfo->my_level);

	transInvalInfo = myInfo;
}

/*
 * PostPrepare_Inval