initial implementation of mi_os_reserve_huge_pages

include/mimalloc-atomic.h

@@ -68,6 +68,9 @@ static inline void* mi_atomic_exchange_ptr(volatile void** p, void* exchange) {
   return (void*)mi_atomic_exchange((volatile uintptr_t*)p, (uintptr_t)exchange);
 }
 
+static inline intptr_t mi_atomic_iread(volatile intptr_t* p) {
+  return (intptr_t)mi_atomic_read( (volatile uintptr_t*)p );
+}
 
 #ifdef _MSC_VER
 #define WIN32_LEAN_AND_MEAN

include/mimalloc-internal.h

@@ -91,6 +91,8 @@ uintptr_t  _mi_heap_random(mi_heap_t* heap);
 
 // "stats.c"
 void       _mi_stats_done(mi_stats_t* stats);
+double     _mi_clock_end(double start);
+double     _mi_clock_start(void);
 
 // "alloc.c"
 void*       _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t size) mi_attr_noexcept;  // called from `_mi_malloc_generic`

include/mimalloc.h

@@ -195,7 +195,7 @@ typedef bool (mi_cdecl mi_block_visit_fun)(const mi_heap_t* heap, const mi_heap_
 mi_decl_export bool mi_heap_visit_blocks(const mi_heap_t* heap, bool visit_all_blocks, mi_block_visit_fun* visitor, void* arg);
 
 mi_decl_export bool mi_is_in_heap_region(const void* p) mi_attr_noexcept;
-
+mi_decl_export int  mi_reserve_huge_os_pages(size_t pages, double max_secs) mi_attr_noexcept;
 
 // ------------------------------------------------------
 // Convenience
@@ -227,7 +227,7 @@ typedef enum mi_option_e {
   mi_option_secure,
   mi_option_eager_commit,
   mi_option_eager_region_commit,
-  mi_option_large_os_pages,      // implies eager commit
+  mi_option_large_os_pages,         // implies eager commit
   mi_option_page_reset,
   mi_option_cache_reset,
   mi_option_reset_decommits,