int __cdecl _heap_init (
int mtflag
)
{
#if defined _M_AMD64 || defined _M_IA64
// HEAP_NO_SERIALIZE is incompatible with the LFH heap
mtflag = 1;
#endif /* defined _M_AMD64 || defined _M_IA64 */
// Initialize the "big-block" heap first.
if ( (_crtheap = HeapCreate( mtflag ? 0 : HEAP_NO_SERIALIZE,
BYTES_PER_PAGE, 0 )) == NULL )
return 0;
#ifndef _WIN64
// Pick a heap, any heap
__active_heap = __heap_select();
if ( __active_heap == __V6_HEAP )
{
// Initialize the small-block heap
if (__sbh_heap_init(MAX_ALLOC_DATA_SIZE) == 0)
{
HeapDestroy(_crtheap);
_crtheap=NULL;
return 0;
}
}
#ifdef CRTDLL
else if ( __active_heap == __V5_HEAP )
{
if ( __old_sbh_new_region() == NULL )
{
HeapDestroy( _crtheap );
_crtheap=NULL;
return 0;
}
}
#endif /* CRTDLL */
#elif defined _M_AMD64 || defined _M_IA64
{
// Enable the Low Fragmentation Heap for AMD64 and IA64 by default
// It's the 8 byte overhead heap, and has generally better
// performance charateristics than the 16 byte overhead heap,
// particularly for apps that perform lots of small allocations
ULONG HeapType = 2;
HeapSetInformation(_crtheap, HeapCompatibilityInformation,
&HeapType, sizeof(HeapType));
}
#endif /* defined _M_AMD64 || defined _M_IA64 */
return 1;
}
int __cdecl _heap_init (
int mtflag
)
{
// Initialize the "big-block" heap first.
if ( (_crtheap = HeapCreate( mtflag ? 0 : HEAP_NO_SERIALIZE,
BYTES_PER_PAGE, 0 )) == NULL )
return 0;
// Initialize the small-block heap
if (__sbh_heap_init() == 0)
{
HeapDestroy(_crtheap);
return 0;
}
return 1;
}