add initial primitive api for locks

include/mimalloc/prim.h

@@ -114,6 +114,24 @@ void _mi_prim_thread_done_auto_done(void);
 // Called when the default heap for a thread changes
 void _mi_prim_thread_associate_default_heap(mi_heap_t* heap);
 
+// Locks are only used if abandoned segment visiting is permitted
+#if defined(_WIN32)
+#define mi_lock_t  CRITICAL_SECTION 
+#elif defined(MI_USE_PTHREADS)
+#define mi_lock_t  pthread_mutex_t
+#else
+#define mi_lock_t  _Atomic(uintptr_t)
+#endif
+
+// Take a lock (blocking). Return `true` on success.
+bool _mi_prim_lock(mi_lock_t* lock);
+
+// Try to take lock and return `true` if successful.
+bool _mi_prim_try_lock(mi_lock_t* lock);
+
+// Release a lock.
+void _mi_prim_unlock(mi_lock_t* lock);
+
 
 //-------------------------------------------------------------------
 // Thread id: `_mi_prim_thread_id()`
@@ -235,10 +253,6 @@ static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
 
 #elif defined(_WIN32)
 
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
 static inline mi_threadid_t _mi_prim_thread_id(void) mi_attr_noexcept {
   // Windows: works on Intel and ARM in both 32- and 64-bit
   return (uintptr_t)NtCurrentTeb();
@@ -370,4 +384,6 @@ static inline mi_heap_t* mi_prim_get_default_heap(void) {
 
 
 
+
+
 #endif  // MIMALLOC_PRIM_H