Function palloc0

src/backend/utils/mmgr/mcxt.c:1330–1361

}

void *
palloc0(Size size)
{
	/* duplicates MemoryContextAllocZero to avoid increased overhead */
	void	   *ret;
	MemoryContext context = CurrentMemoryContext;

	AssertArg(MemoryContextIsValid(context));
	AssertNotInCriticalSection(context);

	if (!AllocSizeIsValid(size))
		elog(ERROR, "invalid memory alloc request size %zu", size);

	context->isReset = false;

	ret = context->methods->alloc(context, size);
	if (unlikely(ret == NULL))
	{
		MemoryContextStats(TopMemoryContext);
		ereport(ERROR,
				(errcode(ERRCODE_OUT_OF_MEMORY),
				 errmsg("out of memory"),
				 errdetail("Failed on request of size %zu in memory context \"%s\".",
						   size, context->name)));
	}

	VALGRIND_MEMPOOL_ALLOC(context, ret, size);

	MemSetAligned(ret, 0, size);

	return ret;
}

void *
palloc_extended(Size size, int flags)