Merge 7023c205aa into bc8eca8bf2

I've got a failure while trying to compile with "-mmacosx-version-min=10.7" since MAC_OS_X_VERSION_MAX_ALLOWED is greater than MAC_OS_X_VERSION_10_15 but still we can't use `aligned_alloc` since of the lower bound (10.7).
I'm not sure about internal details of how `__OSX_AVAILABLE` works, but my hope is the it would only make this interpose available starting from the OS version specified.
Also, it helps me to compile mimalloc with "-mmacosx-version-min=10.7".

CMakeLists.txt

@@ -173,7 +173,8 @@ if(CMAKE_C_COMPILER_ID MATCHES "Intel")
     list(APPEND mi_cflags -Wall)
 endif()
 
-if(CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel")
+# force C++ compilation with msvc or clang-cl to use modern C++ atomics
+if(CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel" OR MI_CLANG_CL)
   set(MI_USE_CXX "ON")
 endif()
 

include/mimalloc/atomic.h

@@ -111,6 +111,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
 #define mi_atomic_cas_ptr_weak_release(tp,p,exp,des)    mi_atomic_cas_weak_release(p,exp,(tp*)des)
 #define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des)    mi_atomic_cas_weak_acq_rel(p,exp,(tp*)des)
 #define mi_atomic_cas_ptr_strong_release(tp,p,exp,des)  mi_atomic_cas_strong_release(p,exp,(tp*)des)
+#define mi_atomic_cas_ptr_strong_acq_rel(tp,p,exp,des)  mi_atomic_cas_strong_acq_rel(p,exp,(tp*)des)
 #define mi_atomic_exchange_ptr_relaxed(tp,p,x)          mi_atomic_exchange_relaxed(p,(tp*)x)
 #define mi_atomic_exchange_ptr_release(tp,p,x)          mi_atomic_exchange_release(p,(tp*)x)
 #define mi_atomic_exchange_ptr_acq_rel(tp,p,x)          mi_atomic_exchange_acq_rel(p,(tp*)x)
@@ -120,6 +121,7 @@ static inline intptr_t mi_atomic_subi(_Atomic(intptr_t)*p, intptr_t sub);
 #define mi_atomic_cas_ptr_weak_release(tp,p,exp,des)    mi_atomic_cas_weak_release(p,exp,des)
 #define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des)    mi_atomic_cas_weak_acq_rel(p,exp,des)
 #define mi_atomic_cas_ptr_strong_release(tp,p,exp,des)  mi_atomic_cas_strong_release(p,exp,des)
+#define mi_atomic_cas_ptr_strong_acq_rel(tp,p,exp,des)  mi_atomic_cas_strong_acq_rel(p,exp,des)
 #define mi_atomic_exchange_ptr_relaxed(tp,p,x)          mi_atomic_exchange_relaxed(p,x)
 #define mi_atomic_exchange_ptr_release(tp,p,x)          mi_atomic_exchange_release(p,x)
 #define mi_atomic_exchange_ptr_acq_rel(tp,p,x)          mi_atomic_exchange_acq_rel(p,x)
@@ -303,6 +305,7 @@ static inline bool mi_atomic_casi64_strong_acq_rel(volatile _Atomic(int64_t*)p,
 #define mi_atomic_cas_ptr_weak_release(tp,p,exp,des)    mi_atomic_cas_weak_release((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des)
 #define mi_atomic_cas_ptr_weak_acq_rel(tp,p,exp,des)    mi_atomic_cas_weak_acq_rel((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des)
 #define mi_atomic_cas_ptr_strong_release(tp,p,exp,des)  mi_atomic_cas_strong_release((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des)
+#define mi_atomic_cas_ptr_strong_acq_rel(tp,p,exp,des)  mi_atomic_cas_strong_acq_rel((_Atomic(uintptr_t)*)(p),(uintptr_t*)exp,(uintptr_t)des)
 #define mi_atomic_exchange_ptr_relaxed(tp,p,x)          (tp*)mi_atomic_exchange_relaxed((_Atomic(uintptr_t)*)(p),(uintptr_t)x)
 #define mi_atomic_exchange_ptr_release(tp,p,x)          (tp*)mi_atomic_exchange_release((_Atomic(uintptr_t)*)(p),(uintptr_t)x)
 #define mi_atomic_exchange_ptr_acq_rel(tp,p,x)          (tp*)mi_atomic_exchange_acq_rel((_Atomic(uintptr_t)*)(p),(uintptr_t)x)

include/mimalloc/internal.h

@@ -140,9 +140,11 @@ void*       _mi_os_alloc_aligned_at_offset(size_t size, size_t alignment, size_t
 void*       _mi_os_get_aligned_hint(size_t try_alignment, size_t size);
 bool        _mi_os_use_large_page(size_t size, size_t alignment);
 size_t      _mi_os_large_page_size(void);
-
 void*       _mi_os_alloc_huge_os_pages(size_t pages, int numa_node, mi_msecs_t max_secs, size_t* pages_reserved, size_t* psize, mi_memid_t* memid);
 
+int         _mi_os_numa_node_count(void);
+int         _mi_os_numa_node(void);
+
 // arena.c
 mi_arena_id_t _mi_arena_id_none(void);
 void        _mi_arena_free(void* p, size_t size, size_t still_committed_size, mi_memid_t memid);
@@ -813,24 +815,6 @@ static inline uintptr_t _mi_random_shuffle(uintptr_t x) {
   return x;
 }
 
-// -------------------------------------------------------------------
-// Optimize numa node access for the common case (= one node)
-// -------------------------------------------------------------------
-
-int    _mi_os_numa_node_get(void);
-size_t _mi_os_numa_node_count_get(void);
-
-extern mi_decl_hidden _Atomic(size_t) _mi_numa_node_count;
-static inline int _mi_os_numa_node(void) {
-  if mi_likely(mi_atomic_load_relaxed(&_mi_numa_node_count) == 1) { return 0; }
-  else return _mi_os_numa_node_get();
-}
-static inline size_t _mi_os_numa_node_count(void) {
-  const size_t count = mi_atomic_load_relaxed(&_mi_numa_node_count);
-  if mi_likely(count > 0) { return count; }
-  else return _mi_os_numa_node_count_get();
-}
-
 
 
 // -----------------------------------------------------------------------

readme.md

@@ -84,7 +84,7 @@ Enjoy!
 
 ### Releases
 
-* 2025-03-28, `v1.9.3`, `v2.2.3`, `v3.0.3` (beta): Various small bug and build fixes, including:
+* 2025-03-28, `v1.9.3`, `v2.2.3`, `v3.0.3` (beta) : Various small bug and build fixes, including:
   fix arm32 pre v7 builds, fix mingw build, get runtime statistics, improve statistic commit counts, 
   fix execution on non BMI1 x64 systems. 
 * 2025-03-06, `v1.9.2`, `v2.2.2`, `v3.0.2-beta`: Various small bug and build fixes. 
@@ -177,7 +177,7 @@ mimalloc is used in various large scale low-latency services and programs, for e
 
 Open `ide/vs2022/mimalloc.sln` in Visual Studio 2022 and build.
 The `mimalloc-lib` project builds a static library (in `out/msvc-x64`), while the
-`mimalloc-override-dll` project builds DLL for overriding malloc
+`mimalloc-override-dll` project builds a DLL for overriding malloc
 in the entire program.
 
 ## Linux, macOS, BSD, etc.

src/alloc-override.c

@@ -77,18 +77,12 @@ typedef void* mi_nothrow_t;
     MI_INTERPOSE_MI(calloc),
     MI_INTERPOSE_MI(realloc),
     MI_INTERPOSE_MI(strdup),
-    #if defined(MAC_OS_X_VERSION_10_7) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
-    MI_INTERPOSE_MI(strndup),
-    #endif
     MI_INTERPOSE_MI(realpath),
     MI_INTERPOSE_MI(posix_memalign),
     MI_INTERPOSE_MI(reallocf),
     MI_INTERPOSE_MI(valloc),
     MI_INTERPOSE_FUN(malloc_size,mi_malloc_size_checked),
     MI_INTERPOSE_MI(malloc_good_size),
-    #if defined(MAC_OS_X_VERSION_10_15) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_15
-    MI_INTERPOSE_MI(aligned_alloc),
-    #endif
     #ifdef MI_OSX_ZONE
     // we interpose malloc_default_zone in alloc-override-osx.c so we can use mi_free safely
     MI_INTERPOSE_MI(free),
@@ -99,6 +93,15 @@ typedef void* mi_nothrow_t;
     MI_INTERPOSE_FUN(vfree,mi_cfree),
     #endif
   };
+  __attribute__((used)) static struct mi_interpose_s _mi_interposes_10_7[]
+  __attribute__((section("__DATA, __interpose"))) __OSX_AVAILABLE(10.7) = {
+      MI_INTERPOSE_MI(strndup),
+};
+
+  __attribute__((used)) static struct mi_interpose_s _mi_interposes_10_15[]
+      __attribute__((section("__DATA, __interpose"))) __OSX_AVAILABLE(10.15) = {
+          MI_INTERPOSE_MI(aligned_alloc),
+  };
 
   #ifdef __cplusplus
   extern "C" {

src/arena.c

@@ -1007,17 +1007,17 @@ int mi_reserve_huge_os_pages_interleave(size_t pages, size_t numa_nodes, size_t
   if (pages == 0) return 0;
 
   // pages per numa node
-  size_t numa_count = (numa_nodes > 0 ? numa_nodes : _mi_os_numa_node_count());
-  if (numa_count <= 0) numa_count = 1;
+  int numa_count = (numa_nodes > 0 && numa_nodes <= INT_MAX ? (int)numa_nodes : _mi_os_numa_node_count());
+  if (numa_count == 0) numa_count = 1;
   const size_t pages_per = pages / numa_count;
   const size_t pages_mod = pages % numa_count;
   const size_t timeout_per = (timeout_msecs==0 ? 0 : (timeout_msecs / numa_count) + 50);
 
   // reserve evenly among numa nodes
-  for (size_t numa_node = 0; numa_node < numa_count && pages > 0; numa_node++) {
+  for (int numa_node = 0; numa_node < numa_count && pages > 0; numa_node++) {
     size_t node_pages = pages_per;  // can be 0
-    if (numa_node < pages_mod) node_pages++;
-    int err = mi_reserve_huge_os_pages_at(node_pages, (int)numa_node, timeout_per);
+    if ((size_t)numa_node < pages_mod) node_pages++;
+    int err = mi_reserve_huge_os_pages_at(node_pages, numa_node, timeout_per);
     if (err) return err;
     if (pages < node_pages) {
       pages = 0;

src/os.c

@@ -696,34 +696,47 @@ static void mi_os_free_huge_os_pages(void* p, size_t size) {
   }
 }
 
+
 /* ----------------------------------------------------------------------------
 Support NUMA aware allocation
 -----------------------------------------------------------------------------*/
 
-_Atomic(size_t)  _mi_numa_node_count; // = 0   // cache the node count
+static _Atomic(size_t) mi_numa_node_count; // = 0   // cache the node count
 
-size_t _mi_os_numa_node_count_get(void) {
-  size_t count = mi_atomic_load_acquire(&_mi_numa_node_count);
-  if (count <= 0) {
+int _mi_os_numa_node_count(void) {
+  size_t count = mi_atomic_load_acquire(&mi_numa_node_count);
+  if mi_unlikely(count == 0) {
     long ncount = mi_option_get(mi_option_use_numa_nodes); // given explicitly?
-    if (ncount > 0) {
+    if (ncount > 0 && ncount < INT_MAX) {
       count = (size_t)ncount;
     }
     else {
-      count = _mi_prim_numa_node_count(); // or detect dynamically
-      if (count == 0) count = 1;
+      const size_t n = _mi_prim_numa_node_count(); // or detect dynamically
+      if (n == 0 || n > INT_MAX) { count = 1; }
+                            else { count = n; }
     }
-    mi_atomic_store_release(&_mi_numa_node_count, count); // save it
+    mi_atomic_store_release(&mi_numa_node_count, count); // save it
     _mi_verbose_message("using %zd numa regions\n", count);
   }
-  return count;
+  mi_assert_internal(count > 0 && count <= INT_MAX);
+  return (int)count;
 }
 
-int _mi_os_numa_node_get(void) {
-  size_t numa_count = _mi_os_numa_node_count();
+static int mi_os_numa_node_get(void) {
+  int numa_count = _mi_os_numa_node_count();
   if (numa_count<=1) return 0; // optimize on single numa node systems: always node 0
   // never more than the node count and >= 0
-  size_t numa_node = _mi_prim_numa_node();
+  const size_t n = _mi_prim_numa_node();
+  int numa_node = (n < INT_MAX ? (int)n : 0);
   if (numa_node >= numa_count) { numa_node = numa_node % numa_count; }
-  return (int)numa_node;
+  return numa_node;
+}
+
+int _mi_os_numa_node(void) {
+  if mi_likely(mi_atomic_load_relaxed(&mi_numa_node_count) == 1) { 
+    return 0; 
+  }
+  else {
+    return mi_os_numa_node_get();
+  }
 }