[3.14] gh-145235: Make dict watcher API thread-safe for free-threaded builds (gh...

In free-threaded builds, concurrent calls to PyDict_AddWatcher, PyDict_ClearWatcher, PyDict_Watch, and PyDict_Unwatch can race on the shared callback array and the per-dict watcher tags. This change adds a mutex to serialize watcher registration and removal, atomic operations for tag updates, and atomic acquire/release synchronization for callback dispatch in _PyDict_SendEvent.

(cherry picked from commit 8a4895985f42282504d83b9bd0c77b129f95a5d5)

Co-authored-by: Alper <alperyoney@fb.com>

diff --git a/Doc/data/python3.14.abi b/Doc/data/python3.14.abi
index 09ef37cf4fa434ac6392bf70c2c0a4dad198a03f..52432e8ea6ef0459dce11c0ca2d52139400cb6a4 100644 (file)
--- a/Doc/data/python3.14.abi
+++ b/Doc/data/python3.14.abi
@@ -7318,30 +7318,30 @@
       <parameter type-id='type-id-6' name='obj' filepath='Objects/dictobject.c' line='7485' column='1'/>
       <return type-id='type-id-3'/>
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-    <function-decl name='PyDict_Watch' mangled-name='PyDict_Watch' filepath='Objects/dictobject.c' line='7711' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_Watch'>
-      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7711' column='1'/>
-      <parameter type-id='type-id-6' name='dict' filepath='Objects/dictobject.c' line='7711' column='1'/>
+    <function-decl name='PyDict_Watch' mangled-name='PyDict_Watch' filepath='Objects/dictobject.c' line='7717' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_Watch'>
+      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7717' column='1'/>
+      <parameter type-id='type-id-6' name='dict' filepath='Objects/dictobject.c' line='7717' column='1'/>
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-    <function-decl name='PyDict_Unwatch' mangled-name='PyDict_Unwatch' filepath='Objects/dictobject.c' line='7726' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_Unwatch'>
-      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7726' column='1'/>
-      <parameter type-id='type-id-6' name='dict' filepath='Objects/dictobject.c' line='7726' column='1'/>
+    <function-decl name='PyDict_Unwatch' mangled-name='PyDict_Unwatch' filepath='Objects/dictobject.c' line='7733' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_Unwatch'>
+      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7733' column='1'/>
+      <parameter type-id='type-id-6' name='dict' filepath='Objects/dictobject.c' line='7733' column='1'/>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='PyDict_AddWatcher' mangled-name='PyDict_AddWatcher' filepath='Objects/dictobject.c' line='7741' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_AddWatcher'>
-      <parameter type-id='type-id-399' name='callback' filepath='Objects/dictobject.c' line='7741' column='1'/>
+    <function-decl name='PyDict_AddWatcher' mangled-name='PyDict_AddWatcher' filepath='Objects/dictobject.c' line='7749' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_AddWatcher'>
+      <parameter type-id='type-id-399' name='callback' filepath='Objects/dictobject.c' line='7749' column='1'/>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='PyDict_ClearWatcher' mangled-name='PyDict_ClearWatcher' filepath='Objects/dictobject.c' line='7758' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_ClearWatcher'>
-      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7758' column='1'/>
+    <function-decl name='PyDict_ClearWatcher' mangled-name='PyDict_ClearWatcher' filepath='Objects/dictobject.c' line='7771' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyDict_ClearWatcher'>
+      <parameter type-id='type-id-5' name='watcher_id' filepath='Objects/dictobject.c' line='7771' column='1'/>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='_PyDict_SendEvent' mangled-name='_PyDict_SendEvent' filepath='Objects/dictobject.c' line='7781' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyDict_SendEvent'>
-      <parameter type-id='type-id-5' name='watcher_bits' filepath='Objects/dictobject.c' line='7781' column='1'/>
-      <parameter type-id='type-id-400' name='event' filepath='Objects/dictobject.c' line='7782' column='1'/>
-      <parameter type-id='type-id-16' name='mp' filepath='Objects/dictobject.c' line='7783' column='1'/>
-      <parameter type-id='type-id-6' name='key' filepath='Objects/dictobject.c' line='7784' column='1'/>
-      <parameter type-id='type-id-6' name='value' filepath='Objects/dictobject.c' line='7785' column='1'/>
+    <function-decl name='_PyDict_SendEvent' mangled-name='_PyDict_SendEvent' filepath='Objects/dictobject.c' line='7800' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyDict_SendEvent'>
+      <parameter type-id='type-id-5' name='watcher_bits' filepath='Objects/dictobject.c' line='7800' column='1'/>
+      <parameter type-id='type-id-400' name='event' filepath='Objects/dictobject.c' line='7801' column='1'/>
+      <parameter type-id='type-id-16' name='mp' filepath='Objects/dictobject.c' line='7802' column='1'/>
+      <parameter type-id='type-id-6' name='key' filepath='Objects/dictobject.c' line='7803' column='1'/>
+      <parameter type-id='type-id-6' name='value' filepath='Objects/dictobject.c' line='7804' column='1'/>
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+      <data-member access='public' layout-offset-in-bits='32'>
+        <var-decl name='watcher_mutex' type-id='type-id-753' visibility='default' filepath='./Include/internal/pycore_dict_state.h' line='16' column='1'/>
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+        <var-decl name='watcher_setup_once' type-id='type-id-987' visibility='default' filepath='./Include/internal/pycore_dict_state.h' line='17' column='1'/>
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+        <var-decl name='watchers' type-id='type-id-812' visibility='default' filepath='./Include/internal/pycore_dict_state.h' line='18' column='1'/>
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@@ -21077,318 +21083,318 @@
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-    <function-decl name='_PyInterpreterState_IDDecref' mangled-name='_PyInterpreterState_IDDecref' filepath='Python/pystate.c' line='1342' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_IDDecref'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1342' column='1'/>
+    <function-decl name='_PyInterpreterState_IDDecref' mangled-name='_PyInterpreterState_IDDecref' filepath='Python/pystate.c' line='1343' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_IDDecref'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1343' column='1'/>
       <return type-id='type-id-3'/>
     </function-decl>
-    <function-decl name='_PyInterpreterState_RequiresIDRef' mangled-name='_PyInterpreterState_RequiresIDRef' filepath='Python/pystate.c' line='1360' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_RequiresIDRef'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1360' column='1'/>
+    <function-decl name='_PyInterpreterState_RequiresIDRef' mangled-name='_PyInterpreterState_RequiresIDRef' filepath='Python/pystate.c' line='1361' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_RequiresIDRef'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1361' column='1'/>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='_PyInterpreterState_RequireIDRef' mangled-name='_PyInterpreterState_RequireIDRef' filepath='Python/pystate.c' line='1366' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_RequireIDRef'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1366' column='1'/>
-      <parameter type-id='type-id-5' name='required' filepath='Python/pystate.c' line='1366' column='1'/>
+    <function-decl name='_PyInterpreterState_RequireIDRef' mangled-name='_PyInterpreterState_RequireIDRef' filepath='Python/pystate.c' line='1367' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_RequireIDRef'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1367' column='1'/>
+      <parameter type-id='type-id-5' name='required' filepath='Python/pystate.c' line='1367' column='1'/>
       <return type-id='type-id-3'/>
     </function-decl>
-    <function-decl name='_PyInterpreterState_LookUpIDObject' mangled-name='_PyInterpreterState_LookUpIDObject' filepath='Python/pystate.c' line='1433' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_LookUpIDObject'>
-      <parameter type-id='type-id-6' name='requested_id' filepath='Python/pystate.c' line='1433' column='1'/>
+    <function-decl name='_PyInterpreterState_LookUpIDObject' mangled-name='_PyInterpreterState_LookUpIDObject' filepath='Python/pystate.c' line='1434' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_LookUpIDObject'>
+      <parameter type-id='type-id-6' name='requested_id' filepath='Python/pystate.c' line='1434' column='1'/>
       <return type-id='type-id-42'/>
     </function-decl>
-    <function-decl name='_PyThreadState_Prealloc' mangled-name='_PyThreadState_Prealloc' filepath='Python/pystate.c' line='1694' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_Prealloc'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1694' column='1'/>
+    <function-decl name='_PyThreadState_Prealloc' mangled-name='_PyThreadState_Prealloc' filepath='Python/pystate.c' line='1695' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_Prealloc'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='1695' column='1'/>
       <return type-id='type-id-40'/>
     </function-decl>
-    <function-decl name='_PyThreadState_Init' mangled-name='_PyThreadState_Init' filepath='Python/pystate.c' line='1702' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_Init'>
-      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='1702' column='1'/>
+    <function-decl name='_PyThreadState_Init' mangled-name='_PyThreadState_Init' filepath='Python/pystate.c' line='1703' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_Init'>
+      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='1703' column='1'/>
       <return type-id='type-id-3'/>
     </function-decl>
-    <function-decl name='PyThreadState_DeleteCurrent' mangled-name='PyThreadState_DeleteCurrent' filepath='Python/pystate.c' line='1966' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_DeleteCurrent'>
+    <function-decl name='PyThreadState_DeleteCurrent' mangled-name='PyThreadState_DeleteCurrent' filepath='Python/pystate.c' line='1967' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_DeleteCurrent'>
       <return type-id='type-id-3'/>
     </function-decl>
-    <function-decl name='_PyThreadState_GetDict' mangled-name='_PyThreadState_GetDict' filepath='Python/pystate.c' line='2052' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_GetDict'>
-      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2052' column='1'/>
+    <function-decl name='_PyThreadState_GetDict' mangled-name='_PyThreadState_GetDict' filepath='Python/pystate.c' line='2053' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThreadState_GetDict'>
+      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2053' column='1'/>
       <return type-id='type-id-6'/>
     </function-decl>
-    <function-decl name='PyThreadState_GetID' mangled-name='PyThreadState_GetID' filepath='Python/pystate.c' line='2101' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_GetID'>
-      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2101' column='1'/>
+    <function-decl name='PyThreadState_GetID' mangled-name='PyThreadState_GetID' filepath='Python/pystate.c' line='2102' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_GetID'>
+      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2102' column='1'/>
       <return type-id='type-id-120'/>
     </function-decl>
-    <function-decl name='PyThreadState_SetAsyncExc' mangled-name='PyThreadState_SetAsyncExc' filepath='Python/pystate.c' line='2501' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_SetAsyncExc'>
-      <parameter type-id='type-id-2' name='id' filepath='Python/pystate.c' line='2501' column='1'/>
-      <parameter type-id='type-id-6' name='exc' filepath='Python/pystate.c' line='2501' column='1'/>
+    <function-decl name='PyThreadState_SetAsyncExc' mangled-name='PyThreadState_SetAsyncExc' filepath='Python/pystate.c' line='2502' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_SetAsyncExc'>
+      <parameter type-id='type-id-2' name='id' filepath='Python/pystate.c' line='2502' column='1'/>
+      <parameter type-id='type-id-6' name='exc' filepath='Python/pystate.c' line='2502' column='1'/>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='PyThreadState_GetUnchecked' mangled-name='PyThreadState_GetUnchecked' filepath='Python/pystate.c' line='2543' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_GetUnchecked'>
+    <function-decl name='PyThreadState_GetUnchecked' mangled-name='PyThreadState_GetUnchecked' filepath='Python/pystate.c' line='2544' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_GetUnchecked'>
       <return type-id='type-id-40'/>
     </function-decl>
-    <function-decl name='PyInterpreterState_Main' mangled-name='PyInterpreterState_Main' filepath='Python/pystate.c' line='2621' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyInterpreterState_Main'>
+    <function-decl name='PyInterpreterState_Main' mangled-name='PyInterpreterState_Main' filepath='Python/pystate.c' line='2622' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyInterpreterState_Main'>
       <return type-id='type-id-42'/>
     </function-decl>
-    <function-decl name='PyInterpreterState_ThreadHead' mangled-name='PyInterpreterState_ThreadHead' filepath='Python/pystate.c' line='2632' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyInterpreterState_ThreadHead'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2632' column='1'/>
+    <function-decl name='PyInterpreterState_ThreadHead' mangled-name='PyInterpreterState_ThreadHead' filepath='Python/pystate.c' line='2633' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyInterpreterState_ThreadHead'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2633' column='1'/>
       <return type-id='type-id-40'/>
     </function-decl>
-    <function-decl name='PyThreadState_Next' mangled-name='PyThreadState_Next' filepath='Python/pystate.c' line='2637' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_Next'>
-      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2637' column='1'/>
+    <function-decl name='PyThreadState_Next' mangled-name='PyThreadState_Next' filepath='Python/pystate.c' line='2638' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyThreadState_Next'>
+      <parameter type-id='type-id-40' name='tstate' filepath='Python/pystate.c' line='2638' column='1'/>
       <return type-id='type-id-40'/>
     </function-decl>
-    <function-decl name='_PyThread_CurrentFrames' mangled-name='_PyThread_CurrentFrames' filepath='Python/pystate.c' line='2652' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThread_CurrentFrames'>
+    <function-decl name='_PyThread_CurrentFrames' mangled-name='_PyThread_CurrentFrames' filepath='Python/pystate.c' line='2653' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyThread_CurrentFrames'>
       <return type-id='type-id-6'/>
     </function-decl>
-    <function-decl name='PyGILState_Check' mangled-name='PyGILState_Check' filepath='Python/pystate.c' line='2849' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyGILState_Check'>
+    <function-decl name='PyGILState_Check' mangled-name='PyGILState_Check' filepath='Python/pystate.c' line='2850' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='PyGILState_Check'>
       <return type-id='type-id-5'/>
     </function-decl>
-    <function-decl name='_PyInterpreterState_GetEvalFrameFunc' mangled-name='_PyInterpreterState_GetEvalFrameFunc' filepath='Python/pystate.c' line='2975' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_GetEvalFrameFunc'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2975' column='1'/>
+    <function-decl name='_PyInterpreterState_GetEvalFrameFunc' mangled-name='_PyInterpreterState_GetEvalFrameFunc' filepath='Python/pystate.c' line='2976' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_GetEvalFrameFunc'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2976' column='1'/>
       <return type-id='type-id-1054'/>
     </function-decl>
-    <function-decl name='_PyInterpreterState_SetEvalFrameFunc' mangled-name='_PyInterpreterState_SetEvalFrameFunc' filepath='Python/pystate.c' line='2985' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_SetEvalFrameFunc'>
-      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2985' column='1'/>
-      <parameter type-id='type-id-1054' name='eval_frame' filepath='Python/pystate.c' line='2986' column='1'/>
+    <function-decl name='_PyInterpreterState_SetEvalFrameFunc' mangled-name='_PyInterpreterState_SetEvalFrameFunc' filepath='Python/pystate.c' line='2986' column='1' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='_PyInterpreterState_SetEvalFrameFunc'>
+      <parameter type-id='type-id-42' name='interp' filepath='Python/pystate.c' line='2986' column='1'/>
+      <parameter type-id='type-id-1054' name='eval_frame' filepath='Python/pystate.c' line='2987' column='1'/>
       <return type-id='type-id-3'/>
     </function-decl>
   </abi-instr>

diff --git a/Include/internal/pycore_dict_state.h b/Include/internal/pycore_dict_state.h
index 11932b8d1e1ab60d49d69693d00dc9cd80ae3fc4..bb6fe262597559617260adb3c6e449e0727a358b 100644 (file)
--- a/Include/internal/pycore_dict_state.h
+++ b/Include/internal/pycore_dict_state.h
@@ -13,6 +13,8 @@ extern "C" {
 
 struct _Py_dict_state {
     uint32_t next_keys_version;
+    PyMutex watcher_mutex;          // Protects the watchers array (free-threaded builds)
+    _PyOnceFlag watcher_setup_once; // One-time optimizer watcher setup
     PyDict_WatchCallback watchers[DICT_MAX_WATCHERS];
 };
 

diff --git a/Include/internal/pycore_pyatomic_ft_wrappers.h b/Include/internal/pycore_pyatomic_ft_wrappers.h
index 31628528321e1b09f9e96779886e54f8c318d24c..bcb9e01a5c8e2587cde9e471d5c32fa166c262b1 100644 (file)
--- a/Include/internal/pycore_pyatomic_ft_wrappers.h
+++ b/Include/internal/pycore_pyatomic_ft_wrappers.h
@@ -132,6 +132,7 @@ extern "C" {
 #define FT_ATOMIC_ADD_SSIZE(value, new_value) \
     (void)_Py_atomic_add_ssize(&value, new_value)
 #define FT_MUTEX_LOCK(lock) PyMutex_Lock(lock)
+#define FT_MUTEX_LOCK_FLAGS(lock, flags) PyMutex_LockFlags(lock, flags)
 #define FT_MUTEX_UNLOCK(lock) PyMutex_Unlock(lock)
 
 #else
@@ -192,6 +193,7 @@ extern "C" {
 #define FT_ATOMIC_STORE_ULLONG_RELAXED(value, new_value) value = new_value
 #define FT_ATOMIC_ADD_SSIZE(value, new_value) (void)(value += new_value)
 #define FT_MUTEX_LOCK(lock) do {} while (0)
+#define FT_MUTEX_LOCK_FLAGS(lock, flags) do {} while (0)
 #define FT_MUTEX_UNLOCK(lock) do {} while (0)
 
 #endif

diff --git a/Lib/test/test_free_threading/test_dict_watcher.py b/Lib/test/test_free_threading/test_dict_watcher.py
new file mode 100644 (file)
index 0000000..6a6843f
--- /dev/null
+++ b/Lib/test/test_free_threading/test_dict_watcher.py
@@ -0,0 +1,89 @@
+import unittest
+
+from test.support import import_helper, threading_helper
+
+_testcapi = import_helper.import_module("_testcapi")
+
+ITERS = 100
+NTHREADS = 20
+
+
+@threading_helper.requires_working_threading()
+class TestDictWatcherThreadSafety(unittest.TestCase):
+    # Watcher kinds from _testcapi
+    EVENTS = 0  # appends dict events as strings to global event list
+
+    def test_concurrent_add_clear_watchers(self):
+        """Race AddWatcher and ClearWatcher from multiple threads.
+
+        Uses more threads than available watcher slots (5 user slots out
+        of DICT_MAX_WATCHERS=8).
+        """
+        results = []
+
+        def worker():
+            for _ in range(ITERS):
+                try:
+                    wid = _testcapi.add_dict_watcher(self.EVENTS)
+                except RuntimeError:
+                    continue  # All slots taken
+                self.assertGreaterEqual(wid, 0)
+                results.append(wid)
+                _testcapi.clear_dict_watcher(wid)
+
+        threading_helper.run_concurrently(worker, NTHREADS)
+
+        # Verify at least some watchers were successfully added
+        self.assertGreater(len(results), 0)
+
+    def test_concurrent_watch_unwatch(self):
+        """Race Watch and Unwatch on the same dict from multiple threads."""
+        wid = _testcapi.add_dict_watcher(self.EVENTS)
+        dicts = [{} for _ in range(10)]
+
+        def worker():
+            for _ in range(ITERS):
+                for d in dicts:
+                    _testcapi.watch_dict(wid, d)
+                for d in dicts:
+                    _testcapi.unwatch_dict(wid, d)
+
+        try:
+            threading_helper.run_concurrently(worker, NTHREADS)
+
+            # Verify watching still works after concurrent watch/unwatch
+            _testcapi.watch_dict(wid, dicts[0])
+            dicts[0]["key"] = "value"
+            events = _testcapi.get_dict_watcher_events()
+            self.assertIn("new:key:value", events)
+        finally:
+            _testcapi.clear_dict_watcher(wid)
+
+    def test_concurrent_modify_watched_dict(self):
+        """Race dict mutations (triggering callbacks) with watch/unwatch."""
+        wid = _testcapi.add_dict_watcher(self.EVENTS)
+        d = {}
+        _testcapi.watch_dict(wid, d)
+
+        def mutator():
+            for i in range(ITERS):
+                d[f"key_{i}"] = i
+                d.pop(f"key_{i}", None)
+
+        def toggler():
+            for i in range(ITERS):
+                _testcapi.watch_dict(wid, d)
+                d[f"toggler_{i}"] = i
+                _testcapi.unwatch_dict(wid, d)
+
+        workers = [mutator, toggler] * (NTHREADS // 2)
+        try:
+            threading_helper.run_concurrently(workers)
+            events = _testcapi.get_dict_watcher_events()
+            self.assertGreater(len(events), 0)
+        finally:
+            _testcapi.clear_dict_watcher(wid)
+
+
+if __name__ == "__main__":
+    unittest.main()

diff --git a/Misc/NEWS.d/next/C_API/2026-02-25-13-37-10.gh-issue-145235.-1ySNR.rst b/Misc/NEWS.d/next/C_API/2026-02-25-13-37-10.gh-issue-145235.-1ySNR.rst
new file mode 100644 (file)
index 0000000..98a8c26
--- /dev/null
+++ b/Misc/NEWS.d/next/C_API/2026-02-25-13-37-10.gh-issue-145235.-1ySNR.rst
@@ -0,0 +1,3 @@
+Made :c:func:`PyDict_AddWatcher`, :c:func:`PyDict_ClearWatcher`,
+:c:func:`PyDict_Watch`, and :c:func:`PyDict_Unwatch` thread-safe on the
+:term:`free threaded <free threading>` build.

diff --git a/Modules/_testcapi/watchers.c b/Modules/_testcapi/watchers.c
index 5a756a87c15fe926c95215d8ce129249e9e6f89a..66fd2f1746831de8291167ab108cbce5761d6845 100644 (file)
--- a/Modules/_testcapi/watchers.c
+++ b/Modules/_testcapi/watchers.c
@@ -9,6 +9,7 @@
 #include "pycore_function.h"      // FUNC_MAX_WATCHERS
 #include "pycore_interp_structs.h" // CODE_MAX_WATCHERS
 #include "pycore_context.h"       // CONTEXT_MAX_WATCHERS
+#include "pycore_lock.h"          // _PyOnceFlag
 
 /*[clinic input]
 module _testcapi
@@ -18,6 +19,14 @@ module _testcapi
 // Test dict watching
 static PyObject *g_dict_watch_events = NULL;
 static int g_dict_watchers_installed = 0;
+static _PyOnceFlag g_dict_watch_once = {0};
+
+static int
+_init_dict_watch_events(void *arg)
+{
+    g_dict_watch_events = PyList_New(0);
+    return g_dict_watch_events ? 0 : -1;
+}
 
 static int
 dict_watch_callback(PyDict_WatchEvent event,
@@ -106,13 +115,10 @@ add_dict_watcher(PyObject *self, PyObject *kind)
     if (watcher_id < 0) {
         return NULL;
     }
-    if (!g_dict_watchers_installed) {
-        assert(!g_dict_watch_events);
-        if (!(g_dict_watch_events = PyList_New(0))) {
-            return NULL;
-        }
+    if (_PyOnceFlag_CallOnce(&g_dict_watch_once, _init_dict_watch_events, NULL) < 0) {
+        return NULL;
     }
-    g_dict_watchers_installed++;
+    _Py_atomic_add_int(&g_dict_watchers_installed, 1);
     return PyLong_FromLong(watcher_id);
 }
 
@@ -122,10 +128,8 @@ clear_dict_watcher(PyObject *self, PyObject *watcher_id)
     if (PyDict_ClearWatcher(PyLong_AsLong(watcher_id))) {
         return NULL;
     }
-    g_dict_watchers_installed--;
-    if (!g_dict_watchers_installed) {
-        assert(g_dict_watch_events);
-        Py_CLEAR(g_dict_watch_events);
+    if (_Py_atomic_add_int(&g_dict_watchers_installed, -1) == 1) {
+        PyList_Clear(g_dict_watch_events);
     }
     Py_RETURN_NONE;
 }
@@ -164,7 +168,7 @@ _testcapi_unwatch_dict_impl(PyObject *module, int watcher_id, PyObject *dict)
 static PyObject *
 get_dict_watcher_events(PyObject *self, PyObject *Py_UNUSED(args))
 {
-    if (!g_dict_watch_events) {
+    if (_Py_atomic_load_int(&g_dict_watchers_installed) <= 0) {
         PyErr_SetString(PyExc_RuntimeError, "no watchers active");
         return NULL;
     }

diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 79a73b5971af3021fb1b1c59d7680edeca1905e2..68f55893e5aaa05aa764fac32030434e754a2c6b 100644 (file)
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -7700,13 +7700,19 @@ validate_watcher_id(PyInterpreterState *interp, int watcher_id)
         PyErr_Format(PyExc_ValueError, "Invalid dict watcher ID %d", watcher_id);
         return -1;
     }
-    if (!interp->dict_state.watchers[watcher_id]) {
+    PyDict_WatchCallback cb = FT_ATOMIC_LOAD_PTR_RELAXED(
+        interp->dict_state.watchers[watcher_id]);
+    if (cb == NULL) {
         PyErr_Format(PyExc_ValueError, "No dict watcher set for ID %d", watcher_id);
         return -1;
     }
     return 0;
 }
 
+// In free-threaded builds, Add/Clear serialize on watcher_mutex and publish
+// callbacks with release stores. SendEvent reads them lock-free using
+// acquire loads.
+
 int
 PyDict_Watch(int watcher_id, PyObject* dict)
 {
@@ -7718,7 +7724,8 @@ PyDict_Watch(int watcher_id, PyObject* dict)
     if (validate_watcher_id(interp, watcher_id)) {
         return -1;
     }
-    FT_ATOMIC_OR_UINT64(((PyDictObject*)dict)->_ma_watcher_tag, (1LL << watcher_id));
+    FT_ATOMIC_OR_UINT64(((PyDictObject*)dict)->_ma_watcher_tag,
+                        1ULL << watcher_id);
     return 0;
 }
 
@@ -7733,36 +7740,48 @@ PyDict_Unwatch(int watcher_id, PyObject* dict)
     if (validate_watcher_id(interp, watcher_id)) {
         return -1;
     }
-    FT_ATOMIC_AND_UINT64(((PyDictObject*)dict)->_ma_watcher_tag, ~(1LL << watcher_id));
+    FT_ATOMIC_AND_UINT64(((PyDictObject*)dict)->_ma_watcher_tag,
+                         ~(1ULL << watcher_id));
     return 0;
 }
 
 int
 PyDict_AddWatcher(PyDict_WatchCallback callback)
 {
+    int watcher_id = -1;
     PyInterpreterState *interp = _PyInterpreterState_GET();
 
+    FT_MUTEX_LOCK_FLAGS(&interp->dict_state.watcher_mutex,
+                        _Py_LOCK_DONT_DETACH);
     /* Start at 2, as 0 and 1 are reserved for CPython */
     for (int i = 2; i < DICT_MAX_WATCHERS; i++) {
         if (!interp->dict_state.watchers[i]) {
-            interp->dict_state.watchers[i] = callback;
-            return i;
+            FT_ATOMIC_STORE_PTR_RELEASE(interp->dict_state.watchers[i], callback);
+            watcher_id = i;
+            goto done;
         }
     }
-
     PyErr_SetString(PyExc_RuntimeError, "no more dict watcher IDs available");
-    return -1;
+done:
+    FT_MUTEX_UNLOCK(&interp->dict_state.watcher_mutex);
+    return watcher_id;
 }
 
 int
 PyDict_ClearWatcher(int watcher_id)
 {
+    int res = 0;
     PyInterpreterState *interp = _PyInterpreterState_GET();
+    FT_MUTEX_LOCK_FLAGS(&interp->dict_state.watcher_mutex,
+                        _Py_LOCK_DONT_DETACH);
     if (validate_watcher_id(interp, watcher_id)) {
-        return -1;
+        res = -1;
+        goto done;
     }
-    interp->dict_state.watchers[watcher_id] = NULL;
-    return 0;
+    FT_ATOMIC_STORE_PTR_RELEASE(interp->dict_state.watchers[watcher_id], NULL);
+done:
+    FT_MUTEX_UNLOCK(&interp->dict_state.watcher_mutex);
+    return res;
 }
 
 static const char *
@@ -7787,7 +7806,8 @@ _PyDict_SendEvent(int watcher_bits,
     PyInterpreterState *interp = _PyInterpreterState_GET();
     for (int i = 0; i < DICT_MAX_WATCHERS; i++) {
         if (watcher_bits & 1) {
-            PyDict_WatchCallback cb = interp->dict_state.watchers[i];
+            PyDict_WatchCallback cb = FT_ATOMIC_LOAD_PTR_ACQUIRE(
+                interp->dict_state.watchers[i]);
             if (cb && (cb(event, (PyObject*)mp, key, value) < 0)) {
                 // We don't want to resurrect the dict by potentially having an
                 // unraisablehook keep a reference to it, so we don't pass the

diff --git a/Python/optimizer_analysis.c b/Python/optimizer_analysis.c
index 84a660658e3cb7ae661aa2ce6ea893a6142aed6b..5584ae67945971af9730153c38fa1ce58e8b3122 100644 (file)
--- a/Python/optimizer_analysis.c
+++ b/Python/optimizer_analysis.c
@@ -18,6 +18,7 @@
 #include "pycore_opcode_metadata.h"
 #include "pycore_opcode_utils.h"
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()
+#include "pycore_pyatomic_ft_wrappers.h" // FT_ATOMIC_*
 #include "pycore_uop_metadata.h"
 #include "pycore_long.h"
 #include "pycore_interpframe.h"  // _PyFrame_GetCode
@@ -62,7 +63,7 @@ static void
 increment_mutations(PyObject* dict) {
     assert(PyDict_CheckExact(dict));
     PyDictObject *d = (PyDictObject *)dict;
-    FT_ATOMIC_ADD_UINT64(d->_ma_watcher_tag, (1 << DICT_MAX_WATCHERS));
+    FT_ATOMIC_ADD_UINT64(d->_ma_watcher_tag, 1ULL << DICT_MAX_WATCHERS);
 }
 
 /* The first two dict watcher IDs are reserved for CPython,
@@ -91,6 +92,17 @@ type_watcher_callback(PyTypeObject* type)
     return 0;
 }
 
+static int
+_setup_optimizer_watchers(void *Py_UNUSED(arg))
+{
+    PyInterpreterState *interp = _PyInterpreterState_GET();
+    FT_ATOMIC_STORE_PTR_RELEASE(
+        interp->dict_state.watchers[GLOBALS_WATCHER_ID],
+        globals_watcher_callback);
+    interp->type_watchers[TYPE_WATCHER_ID] = type_watcher_callback;
+    return 0;
+}
+
 static PyObject *
 convert_global_to_const(_PyUOpInstruction *inst, PyObject *obj, bool pop)
 {
@@ -172,12 +184,8 @@ remove_globals(_PyInterpreterFrame *frame, _PyUOpInstruction *buffer,
     uint32_t builtins_watched = 0;
     uint32_t globals_watched = 0;
     uint32_t prechecked_function_version = 0;
-    if (interp->dict_state.watchers[GLOBALS_WATCHER_ID] == NULL) {
-        interp->dict_state.watchers[GLOBALS_WATCHER_ID] = globals_watcher_callback;
-    }
-    if (interp->type_watchers[TYPE_WATCHER_ID] == NULL) {
-        interp->type_watchers[TYPE_WATCHER_ID] = type_watcher_callback;
-    }
+    _PyOnceFlag_CallOnce(&interp->dict_state.watcher_setup_once,
+                         _setup_optimizer_watchers, NULL);
     for (int pc = 0; pc < buffer_size; pc++) {
         _PyUOpInstruction *inst = &buffer[pc];
         int opcode = inst->opcode;

diff --git a/Python/pystate.c b/Python/pystate.c
index 2b67a40fe4f78732035f59228ed71739d50e6ce0..06672ceb2143c902fc13e9d448c03f5566ecdd7e 100644 (file)
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -408,6 +408,7 @@ _Py_COMP_DIAG_POP
         &(runtime)->allocators.mutex, \
         &(runtime)->_main_interpreter.types.mutex, \
         &(runtime)->_main_interpreter.code_state.mutex, \
+        &(runtime)->_main_interpreter.dict_state.watcher_mutex, \
     }
 
 static void

diff --git a/Tools/c-analyzer/cpython/ignored.tsv b/Tools/c-analyzer/cpython/ignored.tsv
index ba9119a06d57e2b7003c835256efdd872487028a..737924fd8581c0130c9bd2b15a9d891281334f50 100644 (file)
--- a/Tools/c-analyzer/cpython/ignored.tsv
+++ b/Tools/c-analyzer/cpython/ignored.tsv
@@ -454,6 +454,7 @@ Modules/_testcapi/object.c  -       MyObject_dealloc_called -
 Modules/_testcapi/object.c     -       MyType  -
 Modules/_testcapi/structmember.c       -       test_structmembersType_OldAPI   -
 Modules/_testcapi/watchers.c   -       g_dict_watch_events     -
+Modules/_testcapi/watchers.c   -       g_dict_watch_once       -
 Modules/_testcapi/watchers.c   -       g_dict_watchers_installed       -
 Modules/_testcapi/watchers.c   -       g_type_modified_events  -
 Modules/_testcapi/watchers.c   -       g_type_watchers_installed       -