Atomic assigns

python · Feb 21, 2024 · 0d9fef7 · 0d9fef7
1 parent 113687a
commit 0d9fef7
Showing 1 changed file with 34 additions and 27 deletions.
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
@@ -115,19 +115,20 @@ As a consequence of this, split keys have a maximum size of 16.
 #define PyDict_MINSIZE 8
 
 #include "Python.h"
-#include "pycore_bitutils.h"            // _Py_bit_length
-#include "pycore_call.h"                // _PyObject_CallNoArgs()
-#include "pycore_ceval.h"               // _PyEval_GetBuiltin()
-#include "pycore_code.h"                // stats
-#include "pycore_critical_section.h"    // Py_BEGIN_CRITICAL_SECTION, Py_END_CRITICAL_SECTION
-#include "pycore_dict.h"                // export _PyDict_SizeOf()
-#include "pycore_freelist.h"            // _PyFreeListState_GET()
-#include "pycore_gc.h"                  // _PyObject_GC_IS_TRACKED()
-#include "pycore_object.h"              // _PyObject_GC_TRACK(), _PyDebugAllocatorStats()
-#include "pycore_pyerrors.h"            // _PyErr_GetRaisedException()
-#include "pycore_pystate.h"             // _PyThreadState_GET()
-#include "pycore_setobject.h"           // _PySet_NextEntry()
-#include "stringlib/eq.h"               // unicode_eq()
+#include "pycore_bitutils.h"             // _Py_bit_length
+#include "pycore_call.h"                 // _PyObject_CallNoArgs()
+#include "pycore_ceval.h"                // _PyEval_GetBuiltin()
+#include "pycore_code.h"                 // stats
+#include "pycore_critical_section.h"     // Py_BEGIN_CRITICAL_SECTION, Py_END_CRITICAL_SECTION
+#include "pycore_dict.h"                 // export _PyDict_SizeOf()
+#include "pycore_freelist.h"             // _PyFreeListState_GET()
+#include "pycore_gc.h"                   // _PyObject_GC_IS_TRACKED()
+#include "pycore_pyatomic_ft_wrappers.h" // FT_ATOMIC_STORE_PTR_RELAXED
+#include "pycore_object.h"               // _PyObject_GC_TRACK(), _PyDebugAllocatorStats()
+#include "pycore_pyerrors.h"             // _PyErr_GetRaisedException()
+#include "pycore_pystate.h"              // _PyThreadState_GET()
+#include "pycore_setobject.h"            // _PySet_NextEntry()
+#include "stringlib/eq.h"                // unicode_eq
 
 #include <stdbool.h>
 
@@ -234,6 +235,13 @@ set_values(PyDictObject *mp, PyDictValues *values)
 
 #endif
 
+#define STORE_KEY(ep, key) FT_ATOMIC_STORE_PTR_RELAXED(ep->me_key, key)
+#define STORE_VALUE(ep, value) FT_ATOMIC_STORE_PTR_RELAXED(ep->me_value, value)
+#define STORE_SPLIT_VALUE(mp, idx, value) FT_ATOMIC_STORE_PTR_RELAXED(mp->ma_values->values[idx], value)
+#define STORE_HASH(ep, hash) FT_ATOMIC_STORE_SSIZE_RELAXED(ep->me_hash, hash)
+#define STORE_KEYS_USABLE(keys, usable) FT_ATOMIC_STORE_SSIZE_RELAXED(keys->dk_usable, usable)
+#define STORE_KEYS_NENTRIES(keys, nentries) FT_ATOMIC_STORE_SSIZE_RELAXED(keys->dk_nentries, nentries)
+
 #define PERTURB_SHIFT 5
 
 /*
@@ -1605,7 +1613,6 @@ insert_into_splitdictkeys(PyDictKeysObject *keys, PyObject *name)
     return ix;
 }
 
-
 static inline int
 insert_combined_dict(PyInterpreterState *interp, PyDictObject *mp,
                      Py_hash_t hash, PyObject *key, PyObject *value)
@@ -1623,18 +1630,18 @@ insert_combined_dict(PyInterpreterState *interp, PyDictObject *mp,
     if (DK_IS_UNICODE(mp->ma_keys)) {
         PyDictUnicodeEntry *ep;
         ep = &DK_UNICODE_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries];
-        ep->me_key = key;
-        ep->me_value = value;
+        STORE_KEY(ep, key);
+        STORE_VALUE(ep, value);
     }
     else {
         PyDictKeyEntry *ep;
         ep = &DK_ENTRIES(mp->ma_keys)[mp->ma_keys->dk_nentries];
-        ep->me_key = key;
-        ep->me_hash = hash;
-        ep->me_value = value;
+        STORE_KEY(ep, key);
+        STORE_VALUE(ep, value);
+        STORE_HASH(ep, hash);
     }
-    mp->ma_keys->dk_usable--;
-    mp->ma_keys->dk_nentries++;
+    STORE_KEYS_USABLE(mp->ma_keys, mp->ma_keys->dk_usable - 1);
+    STORE_KEYS_NENTRIES(mp->ma_keys, mp->ma_keys->dk_nentries + 1);
     assert(mp->ma_keys->dk_usable >= 0);
     return 0;
 }
@@ -1666,7 +1673,7 @@ insert_split_dict(PyInterpreterState *interp, PyDictObject *mp,
     Py_ssize_t index = keys->dk_nentries;
     _PyDictValues_AddToInsertionOrder(mp->ma_values, index);
     assert (mp->ma_values->values[index] == NULL);
-    mp->ma_values->values[index] = value;
+    STORE_SPLIT_VALUE(mp, index, value);
 
     split_keys_entry_added(keys);
     assert(keys->dk_usable >= 0);
@@ -2491,15 +2498,15 @@ delitem_common(PyDictObject *mp, Py_hash_t hash, Py_ssize_t ix,
         if (DK_IS_UNICODE(mp->ma_keys)) {
             PyDictUnicodeEntry *ep = &DK_UNICODE_ENTRIES(mp->ma_keys)[ix];
             old_key = ep->me_key;
-            ep->me_key = NULL;
-            ep->me_value = NULL;
+            STORE_KEY(ep, NULL);
+            STORE_VALUE(ep, NULL);
         }
         else {
             PyDictKeyEntry *ep = &DK_ENTRIES(mp->ma_keys)[ix];
             old_key = ep->me_key;
-            ep->me_key = NULL;
-            ep->me_value = NULL;
-            ep->me_hash = 0;
+            STORE_KEY(ep, NULL);
+            STORE_VALUE(ep, NULL);
+            STORE_HASH(ep, 0);
         }
         Py_DECREF(old_key);
     }