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- (instancetype)initWithItemSize: (size_t)itemSize
count: (size_t)count
{
self = [super init];
@try {
size_t size, pageSize;
if OF_UNLIKELY (itemSize == 0)
@throw [OFInvalidArgumentException exception];
if OF_UNLIKELY (count > SIZE_MAX / itemSize)
@throw [OFOutOfRangeException exception];
size = itemSize * count;
pageSize = [OFSystemInfo pageSize];
of_explicit_memset(_items, 0, _mappingSize);
of_explicit_memset(_items, 0, size);
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- (instancetype)initWithItemSize: (size_t)itemSize
count: (size_t)count
{
self = [super init];
@try {
size_t size;
#if defined(HAVE_MMAP) && defined(HAVE_MLOCK) && defined(MAP_ANON)
size_t pageSize;
#endif
if OF_UNLIKELY (itemSize == 0)
@throw [OFInvalidArgumentException exception];
if OF_UNLIKELY (count > SIZE_MAX / itemSize)
@throw [OFOutOfRangeException exception];
size = itemSize * count;
#if defined(HAVE_MMAP) && defined(HAVE_MLOCK) && defined(MAP_ANON)
pageSize = [OFSystemInfo pageSize];
_mappingSize = OF_ROUND_UP_POW2(pageSize, size);
if OF_UNLIKELY (_mappingSize < size)
@throw [OFOutOfRangeException exception];
if OF_UNLIKELY ((_items = mmap(NULL, _mappingSize,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0)) ==
MAP_FAILED)
@throw [OFOutOfMemoryException
exceptionWithRequestedSize: _mappingSize];
if OF_UNLIKELY (mlock(_items, _mappingSize) != 0)
@throw [OFOutOfMemoryException
exceptionWithRequestedSize: _mappingSize];
#else
if OF_UNLIKELY ((_items = malloc(size)) == NULL)
@throw [OFOutOfMemoryException
exceptionWithRequestedSize: size];
#endif
_itemSize = itemSize;
_count = count;
[self zero];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
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