Revert "pythongh-128942: make array module thread safe (python#128943)"

The change regressed performance on scimark benchmarks from the
pyperformance benchmark suite.

This reverts commit 8ba0d7b.

Author: colesbury

Lib/test/test_array.py

@@ -3,21 +3,16 @@
 """
 
 import collections.abc
-import io
 import unittest
 from test import support
 from test.support import import_helper
 from test.support import os_helper
-from test.support import threading_helper
 from test.support import _2G
 import weakref
 import pickle
 import operator
-import random
 import struct
 import sys
-import sysconfig
-import threading
 import warnings
 
 import array
@@ -1678,266 +1673,5 @@ def test_gh_128961(self):
         self.assertRaises(StopIteration, next, it)
 
 
-class FreeThreadingTest(unittest.TestCase):
-    # Test pretty much everything that can break under free-threading.
-    # Non-deterministic, but at least one of these things will fail if
-    # array module is not free-thread safe.
-
-    @unittest.skipUnless(support.Py_GIL_DISABLED, 'this test can only possibly fail with GIL disabled')
-    @threading_helper.reap_threads
-    @threading_helper.requires_working_threading()
-    def test_free_threading(self):
-        def pop1(b, a):  # MODIFIES!
-            b.wait()
-            try: a.pop()
-            except IndexError: pass
-
-        def append1(b, a):  # MODIFIES!
-            b.wait()
-            a.append(2)
-
-        def insert1(b, a):  # MODIFIES!
-            b.wait()
-            a.insert(0, 2)
-
-        def extend(b, a):  # MODIFIES!
-            c = array.array('i', [2])
-            b.wait()
-            a.extend(c)
-
-        def extend2(b, a, c):  # MODIFIES!
-            b.wait()
-            a.extend(c)
-
-        def inplace_concat(b, a):  # MODIFIES!
-            c = array.array('i', [2])
-            b.wait()
-            a += c
-
-        def inplace_concat2(b, a, c):  # MODIFIES!
-            b.wait()
-            a += c
-
-        def inplace_repeat2(b, a):  # MODIFIES!
-            b.wait()
-            a *= 2
-
-        def clear(b, a, *args):  # MODIFIES!
-            b.wait()
-            a.clear()
-
-        def clear2(b, a, c):  # MODIFIES c!
-            b.wait()
-            try: c.clear()
-            except BufferError: pass
-
-        def remove1(b, a):  # MODIFIES!
-            b.wait()
-            try: a.remove(1)
-            except ValueError: pass
-
-        def fromunicode(b, a):  # MODIFIES!
-            b.wait()
-            a.fromunicode('test')
-
-        def frombytes(b, a):  # MODIFIES!
-            b.wait()
-            a.frombytes(b'0000')
-
-        def frombytes2(b, a, c):  # MODIFIES!
-            b.wait()
-            a.frombytes(c)
-
-        def fromlist(b, a):  # MODIFIES!
-            n = random.randint(0, 100)
-            b.wait()
-            a.fromlist([2] * n)
-
-        def ass_subscr2(b, a, c):  # MODIFIES!
-            b.wait()
-            a[:] = c
-
-        def ass0(b, a):  # modifies inplace
-            b.wait()
-            try: a[0] = 0
-            except IndexError: pass
-
-        def byteswap(b, a):  # modifies inplace
-            b.wait()
-            a.byteswap()
-
-        def tounicode(b, a):
-            b.wait()
-            a.tounicode()
-
-        def tobytes(b, a):
-            b.wait()
-            a.tobytes()
-
-        def tolist(b, a):
-            b.wait()
-            a.tolist()
-
-        def tofile(b, a):
-            f = io.BytesIO()
-            b.wait()
-            a.tofile(f)
-
-        def reduce_ex2(b, a):
-            b.wait()
-            a.__reduce_ex__(2)
-
-        def reduce_ex3(b, a):
-            b.wait()
-            c = a.__reduce_ex__(3)
-            assert not c[1] or 0xdd not in c[1][3]
-
-        def copy(b, a):
-            b.wait()
-            c = a.__copy__()
-            assert not c or 0xdd not in c
-
-        def repr1(b, a):
-            b.wait()
-            repr(a)
-
-        def repeat2(b, a):
-            b.wait()
-            a * 2
-
-        def count1(b, a):
-            b.wait()
-            a.count(1)
-
-        def index1(b, a):
-            b.wait()
-            try: a.index(1)
-            except ValueError: pass
-
-        def contains1(b, a):
-            b.wait()
-            try: 1 in a
-            except ValueError: pass
-
-        def subscr0(b, a):
-            b.wait()
-            try: a[0]
-            except IndexError: pass
-
-        def concat(b, a):
-            b.wait()
-            a + a
-
-        def concat2(b, a, c):
-            b.wait()
-            a + c
-
-        def richcmplhs(b, a):
-            c = a[:]
-            b.wait()
-            a == c
-
-        def richcmprhs(b, a):
-            c = a[:]
-            b.wait()
-            c == a
-
-        def new(b, a):
-            tc = a.typecode
-            b.wait()
-            array.array(tc, a)
-
-        def repr_(b, a):
-            b.wait()
-            repr(a)
-
-        def irepeat(b, a):  # MODIFIES!
-            b.wait()
-            a *= 2
-
-        def newi(b, l):
-            b.wait()
-            array.array('i', l)
-
-        def fromlistl(b, a, l):  # MODIFIES!
-            b.wait()
-            a.fromlist(l)
-
-        def fromlistlclear(b, a, l):  # MODIFIES LIST!
-            b.wait()
-            l.clear()
-
-        def iter_next(b, a, it):  # MODIFIES ITERATOR!
-            b.wait()
-            list(it)
-
-        def iter_reduce(b, a, it):
-            b.wait()
-            c = it.__reduce__()
-            assert not c[1] or 0xdd not in c[1][0]
-
-        def check(funcs, a=None, *args):
-            if a is None:
-                a = array.array('i', [1])
-
-            barrier = threading.Barrier(len(funcs))
-            threads = []
-
-            for func in funcs:
-                thread = threading.Thread(target=func, args=(barrier, a, *args))
-
-                threads.append(thread)
-
-            with threading_helper.start_threads(threads):
-                pass
-
-        check([pop1] * 10)
-        check([pop1] + [subscr0] * 10)
-        check([append1] * 10)
-        check([insert1] * 10)
-        check([pop1] + [index1] * 10)
-        check([pop1] + [contains1] * 10)
-        check([insert1] + [repeat2] * 10)
-        check([pop1] + [repr1] * 10)
-        check([inplace_repeat2] * 10)
-        check([byteswap] * 10)
-        check([insert1] + [clear] * 10)
-        check([pop1] + [count1] * 10)
-        check([remove1] * 10)
-        check([clear] + [copy] * 10, array.array('B', b'0' * 0x400000))
-        check([pop1] + [reduce_ex2] * 10)
-        check([clear] + [reduce_ex3] * 10, array.array('B', b'0' * 0x400000))
-        check([pop1] + [tobytes] * 10)
-        check([pop1] + [tolist] * 10)
-        check([clear, tounicode] * 10, array.array('w', 'a'*10000))
-        check([clear, tofile] * 10, array.array('w', 'a'*10000))
-        check([clear] + [extend] * 10)
-        check([clear] + [inplace_concat] * 10)
-        check([clear] + [concat] * 10, array.array('w', 'a'*10000))
-        check([fromunicode] * 10, array.array('w', 'a'))
-        check([frombytes] * 10)
-        check([fromlist] * 10)
-        check([clear] + [richcmplhs] * 10, array.array('i', [1]*10000))
-        check([clear] + [richcmprhs] * 10, array.array('i', [1]*10000))
-        check([clear, ass0] * 10, array.array('i', [1]*10000))  # to test array_ass_item must disable Py_mp_ass_subscript
-        check([clear] + [new] * 10, array.array('w', 'a'*10000))
-        check([clear] + [repr_] * 10, array.array('B', b'0' * 0x40000))
-        check([clear] + [repr_] * 10, array.array('B', b'0' * 0x40000))
-        check([clear] + [irepeat] * 10, array.array('B', b'0' * 0x40000))
-        check([clear] + [iter_reduce] * 10, a := array.array('B', b'0' * 0x400), iter(a))
-
-        # make sure we handle non-self objects correctly
-        check([clear] + [newi] * 10, [2] * random.randint(0, 100))
-        check([fromlistlclear] + [fromlistl] * 10, array.array('i', [1]), [2] * random.randint(0, 100))
-        check([clear2] + [concat2] * 10, array.array('w', 'a'*10000), array.array('w', 'a'*10000))
-        check([clear2] + [inplace_concat2] * 10, array.array('w', 'a'*10000), array.array('w', 'a'*10000))
-        check([clear2] + [extend2] * 10, array.array('w', 'a'*10000), array.array('w', 'a'*10000))
-        check([clear2] + [ass_subscr2] * 10, array.array('w', 'a'*10000), array.array('w', 'a'*10000))
-        check([clear2] + [frombytes2] * 10, array.array('w', 'a'*10000), array.array('B', b'a'*10000))
-
-        # iterator stuff
-        check([clear] + [iter_next] * 10, a := array.array('i', [1] * 10), iter(a))
-
-
 if __name__ == "__main__":
     unittest.main()