From 1118f6f4f2900d7424521a97465b4f7b92a650f6 Mon Sep 17 00:00:00 2001
From: Russell Keith-Magee <russell@keith-magee.com>
Date: Thu, 8 Jan 2026 16:00:03 +0800
Subject: [PATCH 1/2] Add Emscripten test skips for recently added tests.

---
 Lib/profiling/sampling/sample.py                         | 2 +-
 Lib/test/test_grammar.py                                 | 9 +++++++--
 .../test_profiling/test_sampling_profiler/test_cli.py    | 1 +
 .../test_sampling_profiler/test_collectors.py            | 3 +++
 4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Lib/profiling/sampling/sample.py b/Lib/profiling/sampling/sample.py
index e73306ebf290e7..530a0fe85b20b5 100644
--- a/Lib/profiling/sampling/sample.py
+++ b/Lib/profiling/sampling/sample.py
@@ -41,7 +41,7 @@ def _pause_threads(unwinder, blocking):
 except ImportError:
     LiveStatsCollector = None
 
-_FREE_THREADED_BUILD = sysconfig.get_config_var("Py_GIL_DISABLED") is not None
+_FREE_THREADED_BUILD = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))
 # Minimum number of samples required before showing the TUI
 # If fewer samples are collected, we skip the TUI and just print a message
 MIN_SAMPLES_FOR_TUI = 200
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index cfb24a5c457820..ebcd98a0a37776 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -1,8 +1,6 @@
 # Python test set -- part 1, grammar.
 # This just tests whether the parser accepts them all.
 
-from test.support import check_syntax_error, skip_wasi_stack_overflow
-from test.support import import_helper
 import annotationlib
 import inspect
 import unittest
@@ -18,6 +16,12 @@
 import typing
 from test.typinganndata import ann_module2
 import test
+from test.support import (
+    check_syntax_error,
+    import_helper,
+    skip_emscripten_stack_overflow,
+    skip_wasi_stack_overflow,
+)
 from test.support.numbers import (
     VALID_UNDERSCORE_LITERALS,
     INVALID_UNDERSCORE_LITERALS,
@@ -250,6 +254,7 @@ def test_eof_error(self):
             self.assertIn("was never closed", str(cm.exception))
 
     @skip_wasi_stack_overflow()
+    @skip_emscripten_stack_overflow()
     def test_max_level(self):
         # Macro defined in Parser/lexer/state.h
         MAXLEVEL = 200
diff --git a/Lib/test/test_profiling/test_sampling_profiler/test_cli.py b/Lib/test/test_profiling/test_sampling_profiler/test_cli.py
index f187f6c51d88e2..0d92bd1796e9af 100644
--- a/Lib/test/test_profiling/test_sampling_profiler/test_cli.py
+++ b/Lib/test/test_profiling/test_sampling_profiler/test_cli.py
@@ -714,6 +714,7 @@ def test_run_nonexistent_module_exits_cleanly(self):
             with self.assertRaisesRegex(SamplingModuleNotFoundError, "Module '[\\w/.]+' not found."):
                 main()
 
+    @unittest.skipIf(is_emscripten, "subprocess not available")
     def test_cli_attach_nonexistent_pid(self):
         fake_pid = "99999"
         with mock.patch("sys.argv", ["profiling.sampling.cli", "attach", fake_pid]):
diff --git a/Lib/test/test_profiling/test_sampling_profiler/test_collectors.py b/Lib/test/test_profiling/test_sampling_profiler/test_collectors.py
index ae336ccdb941ce..8e6afa91e89daf 100644
--- a/Lib/test/test_profiling/test_sampling_profiler/test_collectors.py
+++ b/Lib/test/test_profiling/test_sampling_profiler/test_collectors.py
@@ -7,6 +7,8 @@
 import tempfile
 import unittest
 
+from test.support import is_emscripten
+
 try:
     import _remote_debugging  # noqa: F401
     from profiling.sampling.pstats_collector import PstatsCollector
@@ -599,6 +601,7 @@ def test_gecko_collector_basic(self):
         self.assertGreater(stack_table["length"], 0)
         self.assertGreater(len(stack_table["frame"]), 0)
 
+    @unittest.skipIf(is_emscripten, "threads not available")
     def test_gecko_collector_export(self):
         """Test Gecko profile export functionality."""
         gecko_out = tempfile.NamedTemporaryFile(suffix=".json", delete=False)

From 9c4d800f1e26bc434521fab9e8c270f903ac8cd7 Mon Sep 17 00:00:00 2001
From: Russell Keith-Magee <russell@keith-magee.com>
Date: Thu, 8 Jan 2026 16:44:13 +0800
Subject: [PATCH 2/2] Revert sysconfig freethreading check.

---
 Lib/profiling/sampling/sample.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/profiling/sampling/sample.py b/Lib/profiling/sampling/sample.py
index 530a0fe85b20b5..e73306ebf290e7 100644
--- a/Lib/profiling/sampling/sample.py
+++ b/Lib/profiling/sampling/sample.py
@@ -41,7 +41,7 @@ def _pause_threads(unwinder, blocking):
 except ImportError:
     LiveStatsCollector = None
 
-_FREE_THREADED_BUILD = bool(sysconfig.get_config_var("Py_GIL_DISABLED"))
+_FREE_THREADED_BUILD = sysconfig.get_config_var("Py_GIL_DISABLED") is not None
 # Minimum number of samples required before showing the TUI
 # If fewer samples are collected, we skip the TUI and just print a message
 MIN_SAMPLES_FOR_TUI = 200