gh-108337: Add pyatomic.h header (#108701)

This adds a new header that provides atomic operations on common data
types. The intention is that this will be exposed through Python.h,
although that is not the case yet. The only immediate use is in
the test file.

Co-authored-by: Sam Gross <colesbury@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/Lib/test/test_capi/test_pyatomic.py b/Lib/test/test_capi/test_pyatomic.py
new file mode 100644
index 00000000000..846d6d50c25
--- /dev/null
+++ b/Lib/test/test_capi/test_pyatomic.py
@@ -0,0 +1,15 @@
+import unittest
+from test.support import import_helper
+
+# Skip this test if the _testcapi module isn't available.
+_testcapi = import_helper.import_module('_testcapi')
+
+class PyAtomicTests(unittest.TestCase):
+    pass
+
+for name in sorted(dir(_testcapi)):
+    if name.startswith('test_atomic'):
+        setattr(PyAtomicTests, name, getattr(_testcapi, name))
+
+if __name__ == "__main__":
+    unittest.main()