diff --git a/dtool/src/dtoolbase/memoryHook.I b/dtool/src/dtoolbase/memoryHook.I
index d44289e5f9..2b63050656 100644
--- a/dtool/src/dtoolbase/memoryHook.I
+++ b/dtool/src/dtoolbase/memoryHook.I
@@ -18,7 +18,7 @@
 INLINE void MemoryHook::
 inc_heap(size_t size) {
 #ifdef DO_MEMORY_USAGE
-  AtomicAdjust::add(_requested_heap_size, (AtomicAdjust::Integer)size);
+  _requested_heap_size.fetch_add(size, std::memory_order_relaxed);
 #endif  // DO_MEMORY_USAGE
 }
 
@@ -30,7 +30,7 @@ INLINE void MemoryHook::
 dec_heap(size_t size) {
 #ifdef DO_MEMORY_USAGE
   // assert((int)size <= _requested_heap_size);
-  AtomicAdjust::add(_requested_heap_size, -(AtomicAdjust::Integer)size);
+  _requested_heap_size.fetch_sub(size, std::memory_order_relaxed);
 #endif  // DO_MEMORY_USAGE
 }
 
diff --git a/dtool/src/dtoolbase/memoryHook.cxx b/dtool/src/dtoolbase/memoryHook.cxx
index 60e7695522..f160f956f4 100644
--- a/dtool/src/dtoolbase/memoryHook.cxx
+++ b/dtool/src/dtoolbase/memoryHook.cxx
@@ -203,10 +203,10 @@ ptr_to_alloc(void *ptr, size_t &size) {
  */
 MemoryHook::
 MemoryHook(const MemoryHook &copy) :
-  _total_heap_single_size(copy._total_heap_single_size),
-  _total_heap_array_size(copy._total_heap_array_size),
-  _requested_heap_size(copy._requested_heap_size),
-  _total_mmap_size(copy._total_mmap_size),
+  _total_heap_single_size(copy._total_heap_single_size.load(std::memory_order_relaxed)),
+  _total_heap_array_size(copy._total_heap_array_size.load(std::memory_order_relaxed)),
+  _requested_heap_size(copy._requested_heap_size.load(std::memory_order_relaxed)),
+  _total_mmap_size(copy._total_mmap_size.load(std::memory_order_relaxed)),
   _max_heap_size(copy._max_heap_size),
   _page_size(copy._page_size) {
 }
@@ -250,9 +250,9 @@ heap_alloc_single(size_t size) {
   size = get_ptr_size(alloc);
   inflated_size = size;
 #endif
-  AtomicAdjust::add(_total_heap_single_size, (AtomicAdjust::Integer)size);
-  if ((size_t)AtomicAdjust::get(_total_heap_single_size) +
-      (size_t)AtomicAdjust::get(_total_heap_array_size) >
+  _total_heap_single_size.fetch_add(size, std::memory_order_relaxed);
+  if (_total_heap_single_size.load(std::memory_order_relaxed) +
+      _total_heap_array_size.load(std::memory_order_relaxed) >
       _max_heap_size) {
     overflow_heap_size();
   }
@@ -275,8 +275,8 @@ heap_free_single(void *ptr) {
   void *alloc = ptr_to_alloc(ptr, size);
 
 #ifdef DO_MEMORY_USAGE
-  assert((int)size <= _total_heap_single_size);
-  AtomicAdjust::add(_total_heap_single_size, -(AtomicAdjust::Integer)size);
+  assert((int)size <= _total_heap_single_size.load(std::memory_order_relaxed));
+  _total_heap_single_size.fetch_sub(size, std::memory_order_relaxed);
 #endif  // DO_MEMORY_USAGE
 
 #ifdef MEMORY_HOOK_MALLOC_LOCK
@@ -327,9 +327,9 @@ heap_alloc_array(size_t size) {
   size = get_ptr_size(alloc);
   inflated_size = size;
 #endif
-  AtomicAdjust::add(_total_heap_array_size, (AtomicAdjust::Integer)size);
-  if ((size_t)AtomicAdjust::get(_total_heap_single_size) +
-      (size_t)AtomicAdjust::get(_total_heap_array_size) >
+  _total_heap_array_size.fetch_add(size, std::memory_order_relaxed);
+  if (_total_heap_single_size.load(std::memory_order_relaxed) +
+      _total_heap_array_size.load(std::memory_order_relaxed) >
       _max_heap_size) {
     overflow_heap_size();
   }
@@ -383,8 +383,8 @@ heap_realloc_array(void *ptr, size_t size) {
   size = get_ptr_size(alloc1);
   inflated_size = size;
 #endif
-  assert((AtomicAdjust::Integer)orig_size <= _total_heap_array_size);
-  AtomicAdjust::add(_total_heap_array_size, (AtomicAdjust::Integer)size-(AtomicAdjust::Integer)orig_size);
+  assert(orig_size <= _total_heap_array_size.load(std::memory_order_relaxed));
+  _total_heap_array_size.fetch_add(size - orig_size, std::memory_order_relaxed);
 #endif  // DO_MEMORY_USAGE
 
   // Align this to the requested boundary.
@@ -424,7 +424,7 @@ heap_free_array(void *ptr) {
 
 #ifdef DO_MEMORY_USAGE
   assert((int)size <= _total_heap_array_size);
-  AtomicAdjust::add(_total_heap_array_size, -(AtomicAdjust::Integer)size);
+  _total_heap_array_size.fetch_sub(size, std::memory_order_relaxed);
 #endif  // DO_MEMORY_USAGE
 
 #ifdef MEMORY_HOOK_MALLOC_LOCK
@@ -489,7 +489,7 @@ mmap_alloc(size_t size, bool allow_exec) {
   assert((size % _page_size) == 0);
 
 #ifdef DO_MEMORY_USAGE
-  _total_mmap_size += size;
+  _total_mmap_size.fetch_add(size, std::memory_order_relaxed);
 #endif
 
 #ifdef _WIN32
@@ -544,8 +544,8 @@ mmap_free(void *ptr, size_t size) {
   assert((size % _page_size) == 0);
 
 #ifdef DO_MEMORY_USAGE
-  assert((int)size <= _total_mmap_size);
-  _total_mmap_size -= size;
+  assert((int)size <= _total_mmap_size.load(std::memory_order_relaxed));
+  _total_mmap_size.fetch_sub(size, std::memory_order_relaxed);
 #endif
 
 #ifdef _WIN32
diff --git a/dtool/src/dtoolbase/memoryHook.h b/dtool/src/dtoolbase/memoryHook.h
index d0726c5895..13250e7085 100644
--- a/dtool/src/dtoolbase/memoryHook.h
+++ b/dtool/src/dtoolbase/memoryHook.h
@@ -16,7 +16,7 @@
 
 #include "dtoolbase.h"
 #include "numeric_types.h"
-#include "atomicAdjust.h"
+#include "patomic.h"
 #include "mutexImpl.h"
 #include <map>
 
@@ -66,10 +66,10 @@ public:
   INLINE static size_t get_ptr_size(void *ptr);
 
 protected:
-  TVOLATILE AtomicAdjust::Integer _total_heap_single_size = 0;
-  TVOLATILE AtomicAdjust::Integer _total_heap_array_size = 0;
-  TVOLATILE AtomicAdjust::Integer _requested_heap_size = 0;
-  TVOLATILE AtomicAdjust::Integer _total_mmap_size = 0;
+  patomic<size_t> _total_heap_single_size { 0u };
+  patomic<size_t> _total_heap_array_size { 0u };
+  patomic<size_t> _requested_heap_size { 0u };
+  patomic<size_t> _total_mmap_size { 0u };
 
   // If the allocated heap size crosses this threshold, we call
   // overflow_heap_size().
diff --git a/panda/src/express/memoryUsage.I b/panda/src/express/memoryUsage.I
index a4c2447189..af19a1c358 100644
--- a/panda/src/express/memoryUsage.I
+++ b/panda/src/express/memoryUsage.I
@@ -153,7 +153,7 @@ get_total_cpp_size() {
 INLINE size_t MemoryUsage::
 get_panda_heap_single_size() {
 #ifdef DO_MEMORY_USAGE
-  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_heap_single_size);
+  return get_global_ptr()->_total_heap_single_size.load(std::memory_order_relaxed);
 #else
   return 0;
 #endif
@@ -166,7 +166,7 @@ get_panda_heap_single_size() {
 INLINE size_t MemoryUsage::
 get_panda_heap_array_size() {
 #ifdef DO_MEMORY_USAGE
-  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_heap_array_size);
+  return get_global_ptr()->_total_heap_array_size.load(std::memory_order_relaxed);
 #else
   return 0;
 #endif
@@ -181,7 +181,7 @@ INLINE size_t MemoryUsage::
 get_panda_heap_overhead() {
 #if defined(DO_MEMORY_USAGE) && (defined(USE_MEMORY_DLMALLOC) || defined(USE_MEMORY_PTMALLOC2))
   MemoryUsage *mu = get_global_ptr();
-  return (size_t)(AtomicAdjust::get(mu->_requested_heap_size) - AtomicAdjust::get(mu->_total_heap_single_size) - AtomicAdjust::get(mu->_total_heap_array_size));
+  return mu->_requested_heap_size.load(std::memory_order_relaxed) - mu->_total_heap_single_size.load(std::memory_order_relaxed) - mu->_total_heap_array_size.load(std::memory_order_relaxed);
 #else
   return 0;
 #endif
@@ -194,7 +194,7 @@ get_panda_heap_overhead() {
 INLINE size_t MemoryUsage::
 get_panda_mmap_size() {
 #ifdef DO_MEMORY_USAGE
-  return (size_t)AtomicAdjust::get(get_global_ptr()->_total_mmap_size);
+  return get_global_ptr()->_total_mmap_size.load(std::memory_order_relaxed);
 #else
   return 0;
 #endif
@@ -227,7 +227,7 @@ get_external_size() {
 #else
     // Without alternative malloc, the Panda allocated memory is also included
     // in total_size, so we have to subtract it out.
-    return mu->_total_size - (size_t)mu->_total_heap_single_size - (size_t)mu->_total_heap_array_size;
+    return mu->_total_size - mu->_total_heap_single_size.load(std::memory_order_relaxed) - mu->_total_heap_array_size.load(std::memory_order_relaxed);
 #endif
   } else {
     return 0;
@@ -246,12 +246,12 @@ get_total_size() {
 #ifdef DO_MEMORY_USAGE
   MemoryUsage *mu = get_global_ptr();
   if (mu->_count_memory_usage) {
-    return mu->_total_size + (size_t)mu->_requested_heap_size;
+    return mu->_total_size + mu->_requested_heap_size.load(std::memory_order_relaxed);
   } else {
 #if defined(USE_MEMORY_DLMALLOC) || defined(USE_MEMORY_PTMALLOC2)
-    return (size_t)mu->_requested_heap_size;
+    return mu->_requested_heap_size.load(std::memory_order_relaxed);
 #else
-    return (size_t)(AtomicAdjust::get(mu->_total_heap_single_size) + AtomicAdjust::get(mu->_total_heap_array_size));
+    return mu->_total_heap_single_size.load(std::memory_order_relaxed) + mu->_total_heap_array_size.load(std::memory_order_relaxed);
 #endif
   }
 #else