mark some tests as thread unsafe

src/c/test_c.py

@@ -3288,6 +3288,7 @@ class mylist(list):
     pytest.raises(RuntimeError, from_handle, cast(BCharP, 0))
 
 def test_new_handle_cycle():
+    import gc
     import _weakref
     BVoidP = new_pointer_type(new_void_type())
     class A(object):
@@ -3296,9 +3297,9 @@ class A(object):
     o.cycle = newp_handle(BVoidP, o)
     wr = _weakref.ref(o)
     del o
-    for i in range(3):
-        if wr() is not None:
-            import gc; gc.collect()
+    # free-threading requires more iterations to clear weakref
+    while wr() is not None:
+        gc.collect()
     assert wr() is None
 
 def _test_bitfield_details(flag):

testing/cffi1/test_ffi_obj.py

@@ -32,6 +32,7 @@ def test_ffi_cache_type():
     assert ffi.typeof("int[][10]") is ffi.typeof("int[][10]")
     assert ffi.typeof("int(*)()") is ffi.typeof("int(*)()")
 
+@pytest.mark.thread_unsafe
 def test_ffi_type_not_immortal():
     import weakref, gc
     ffi = _cffi1_backend.FFI()

testing/cffi1/test_pkgconfig.py

@@ -25,7 +25,7 @@ def test_merge_flags():
         "bar" : ["b", "a", "z"],
         "foo" : []}
 
-
+@pytest.mark.thread_unsafe
 def test_pkgconfig():
     assert pkgconfig.flags_from_pkgconfig([]) == {}
 
@@ -56,6 +56,7 @@ def communicate(self):
             self.returncode = rc
             return bout, berr
 
+@pytest.mark.thread_unsafe
 def test_call():
     saved = pkgconfig.subprocess
     try:

testing/cffi1/test_re_python.py

@@ -186,6 +186,7 @@ def test_include_1():
     p = ffi.new("bar_t *", [5, b"foobar"])
     assert p.a[4] == ord('a')
 
+@pytest.mark.thread_unsafe
 def test_global_var():
     from re_python_pysrc import ffi
     lib = ffi.dlopen(extmod)
@@ -238,6 +239,7 @@ def test_partial_enum():
     pytest.raises(VerificationMissing, ffi.emit_python_code,
                    str(tmpdir.join('test_partial_enum.py')))
 
+@pytest.mark.thread_unsafe
 def test_anonymous_union_inside_struct():
     # based on issue #357
     from re_python_pysrc import ffi
@@ -262,6 +264,7 @@ def test_anonymous_union_inside_struct():
     assert ffi.offsetof("struct NVGcolor", "b") == FLOAT * 2
     assert ffi.offsetof("struct NVGcolor", "a") == FLOAT * 3
 
+@pytest.mark.thread_unsafe
 def test_selfref():
     # based on issue #429
     from re_python_pysrc import ffi

testing/embedding/test_basic.py

@@ -39,7 +39,7 @@ def copy_away_env():
     except NameError:
         org_env = os.environ.copy()
 
-
+@pytest.mark.thread_unsafe
 class EmbeddingTests:
     _compiled_modules = {}