ObjFW  Diff

# if defined(OF_HAVE_COMPILER_TLS)
static thread_local struct page *firstPage = NULL;
static thread_local struct page *lastPage = NULL;
static thread_local struct page **preallocatedPages = NULL;
static thread_local size_t numPreallocatedPages = 0;
# elif defined(OF_HAVE_THREADS)
static of_tlskey_t firstPageKey, lastPageKey;
static of_tlskey_t preallocatedPagesKey, numPreallocatedPagesKey;
# else
static struct page *firstPage = NULL;
static struct page *lastPage = NULL;
static struct page **preallocatedPages = NULL;
static size_t numPreallocatedPages = 0;
# endif

# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
	struct page *lastPage;
# endif

	if (allowPreallocated) {
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
		uintptr_t numPreallocatedPages =
		    (uintptr_t)of_tlskey_get(numPreallocatedPagesKey);
# endif

		if (numPreallocatedPages > 0) {
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
			struct page **preallocatedPages =
			    of_tlskey_get(preallocatedPagesKey);
# endif

			numPreallocatedPages--;
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
			OF_ENSURE(of_tlskey_set(numPreallocatedPagesKey,
			    (void *)numPreallocatedPages) == 0);
# endif

			page = preallocatedPages[numPreallocatedPages];

			if (numPreallocatedPages == 0) {
				free(preallocatedPages);
				preallocatedPages = NULL;
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
				OF_ENSURE(of_tlskey_set(preallocatedPagesKey,
				    preallocatedPages) == 0);
# endif
			}

			return page;
		}
	}

		free(page->map);
		free(page);
		@throw e;
	}
	of_explicit_memset(page->page, 0, pageSize);

# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
	lastPage = of_tlskey_get(lastPageKey);
# endif

	page->previous = lastPage;
	page->next = NULL;

	if (lastPage != NULL)
		lastPage->next = page;

# if defined(OF_HAVE_COMPILER_TLS) || !defined(OF_HAVE_THREADS)
	lastPage = page;

	if (firstPage == NULL)
		firstPage = page;
# else
	OF_ENSURE(of_tlskey_set(lastPageKey, page) == 0);

	if (of_tlskey_get(firstPageKey) == NULL)
		OF_ENSURE(of_tlskey_set(firstPageKey, page) == 0);
# endif

	return page;
}

static void
removePageIfEmpty(struct page *page)

# if defined(OF_HAVE_COMPILER_TLS) || !defined(OF_HAVE_THREADS)
	if (firstPage == page)
		firstPage = page->next;
	if (lastPage == page)
		lastPage = page->previous;
# else
	if (of_tlskey_get(firstPageKey) == page)
		OF_ENSURE(of_tlskey_set(firstPageKey, page->next) == 0);
	if (of_tlskey_get(lastPageKey) == page)
		OF_ENSURE(of_tlskey_set(lastPageKey, page->previous) == 0);
# endif

	free(page);
}

static void *
allocateMemory(struct page *page, size_t bytes)

#if defined(HAVE_MMAP) && defined(HAVE_MLOCK) && defined(MAP_ANON) && \
    !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
+ (void)initialize
{
	if (self != [OFSecureData class])
		return;

	if (of_tlskey_new(&firstPageKey) != 0 ||
	    of_tlskey_new(&lastPageKey) != 0 ||
	    of_tlskey_new(&preallocatedPagesKey) != 0 ||
	    of_tlskey_new(&numPreallocatedPagesKey) != 0)
		@throw [OFInitializationFailedException
		    exceptionWithClass: self];
}
#endif

+ (void)preallocateUnswappableMemoryWithSize: (size_t)size
{
#if defined(HAVE_MMAP) && defined(HAVE_MLOCK) && defined(MAP_ANON)
	size_t pageSize = [OFSystemInfo pageSize];
	size_t numPages = OF_ROUND_UP_POW2(pageSize, size) / pageSize;
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
	struct page **preallocatedPages = of_tlskey_get(preallocatedPagesKey);
	size_t numPreallocatedPages;
# endif
	size_t i;

	if (preallocatedPages != NULL)
		@throw [OFInvalidArgumentException exception];

	preallocatedPages = of_alloc_zeroed(numPages, sizeof(struct page));
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
	OF_ENSURE(of_tlskey_set(preallocatedPagesKey, preallocatedPages) == 0);
# endif

	@try {
		for (i = 0; i < numPages; i++)
			preallocatedPages[i] = addPage(false);
	} @catch (id e) {
		for (size_t j = 0; j < i; j++)
			removePageIfEmpty(preallocatedPages[j]);

		free(preallocatedPages);
		preallocatedPages = NULL;

		@throw e;
	}

	numPreallocatedPages = numPages;
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
	OF_ENSURE(of_tlskey_set(numPreallocatedPagesKey,
	    (void *)(uintptr_t)numPreallocatedPages) == 0);
# endif
#else
	@throw [OFNotImplementedException exceptionWithSelector: _cmd
							 object: self];
#endif
}

			memset(_items, 0, count * itemSize);
#if defined(HAVE_MMAP) && defined(HAVE_MLOCK) && defined(MAP_ANON)
		} else if (count * itemSize >= pageSize)
			_items = mapPages(OF_ROUND_UP_POW2(pageSize,
			    count * itemSize) / pageSize);
		else {
# if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
			struct page *lastPage = of_tlskey_get(lastPageKey);
# endif

			for (struct page *page = lastPage; page != NULL;
			    page = page->previous) {
				_items = allocateMemory(page, count * itemSize);

				if (_items != NULL) {