Sync contrib/tools/python3 layout with upstream

* Move src/ subdir contents to the top of the layout
* Rename self-written lib -> lib2 to avoid CaseFolding warning from the VCS
* Regenerate contrib/libs/python proxy-headers accordingly
4ccc62ac1511abcf0fed14ccade38e984e088f1e

7 files changed, 2210 insertions, 0 deletions

diff --git a/contrib/tools/python3/Modules/_multiprocessing/clinic/multiprocessing.c.h b/contrib/tools/python3/Modules/_multiprocessing/clinic/multiprocessing.c.h
new file mode 100644
index 00000000000..885cd5c2fff
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/clinic/multiprocessing.c.h
@@ -0,0 +1,175 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+#  include "pycore_gc.h"            // PyGC_Head
+#  include "pycore_runtime.h"       // _Py_ID()
+#endif
+
+
+#if defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_closesocket__doc__,
+"closesocket($module, handle, /)\n"
+"--\n"
+"\n");
+
+#define _MULTIPROCESSING_CLOSESOCKET_METHODDEF    \
+    {"closesocket", (PyCFunction)_multiprocessing_closesocket, METH_O, _multiprocessing_closesocket__doc__},
+
+static PyObject *
+_multiprocessing_closesocket_impl(PyObject *module, HANDLE handle);
+
+static PyObject *
+_multiprocessing_closesocket(PyObject *module, PyObject *arg)
+{
+    PyObject *return_value = NULL;
+    HANDLE handle;
+
+    handle = PyLong_AsVoidPtr(arg);
+    if (!handle && PyErr_Occurred()) {
+        goto exit;
+    }
+    return_value = _multiprocessing_closesocket_impl(module, handle);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(MS_WINDOWS) */
+
+#if defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_recv__doc__,
+"recv($module, handle, size, /)\n"
+"--\n"
+"\n");
+
+#define _MULTIPROCESSING_RECV_METHODDEF    \
+    {"recv", _PyCFunction_CAST(_multiprocessing_recv), METH_FASTCALL, _multiprocessing_recv__doc__},
+
+static PyObject *
+_multiprocessing_recv_impl(PyObject *module, HANDLE handle, int size);
+
+static PyObject *
+_multiprocessing_recv(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    HANDLE handle;
+    int size;
+
+    if (!_PyArg_CheckPositional("recv", nargs, 2, 2)) {
+        goto exit;
+    }
+    handle = PyLong_AsVoidPtr(args[0]);
+    if (!handle && PyErr_Occurred()) {
+        goto exit;
+    }
+    size = _PyLong_AsInt(args[1]);
+    if (size == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    return_value = _multiprocessing_recv_impl(module, handle, size);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(MS_WINDOWS) */
+
+#if defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_send__doc__,
+"send($module, handle, buf, /)\n"
+"--\n"
+"\n");
+
+#define _MULTIPROCESSING_SEND_METHODDEF    \
+    {"send", _PyCFunction_CAST(_multiprocessing_send), METH_FASTCALL, _multiprocessing_send__doc__},
+
+static PyObject *
+_multiprocessing_send_impl(PyObject *module, HANDLE handle, Py_buffer *buf);
+
+static PyObject *
+_multiprocessing_send(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    HANDLE handle;
+    Py_buffer buf = {NULL, NULL};
+
+    if (!_PyArg_CheckPositional("send", nargs, 2, 2)) {
+        goto exit;
+    }
+    handle = PyLong_AsVoidPtr(args[0]);
+    if (!handle && PyErr_Occurred()) {
+        goto exit;
+    }
+    if (PyObject_GetBuffer(args[1], &buf, PyBUF_SIMPLE) != 0) {
+        goto exit;
+    }
+    if (!PyBuffer_IsContiguous(&buf, 'C')) {
+        _PyArg_BadArgument("send", "argument 2", "contiguous buffer", args[1]);
+        goto exit;
+    }
+    return_value = _multiprocessing_send_impl(module, handle, &buf);
+
+exit:
+    /* Cleanup for buf */
+    if (buf.obj) {
+       PyBuffer_Release(&buf);
+    }
+
+    return return_value;
+}
+
+#endif /* defined(MS_WINDOWS) */
+
+PyDoc_STRVAR(_multiprocessing_sem_unlink__doc__,
+"sem_unlink($module, name, /)\n"
+"--\n"
+"\n");
+
+#define _MULTIPROCESSING_SEM_UNLINK_METHODDEF    \
+    {"sem_unlink", (PyCFunction)_multiprocessing_sem_unlink, METH_O, _multiprocessing_sem_unlink__doc__},
+
+static PyObject *
+_multiprocessing_sem_unlink_impl(PyObject *module, const char *name);
+
+static PyObject *
+_multiprocessing_sem_unlink(PyObject *module, PyObject *arg)
+{
+    PyObject *return_value = NULL;
+    const char *name;
+
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("sem_unlink", "argument", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t name_length;
+    name = PyUnicode_AsUTF8AndSize(arg, &name_length);
+    if (name == NULL) {
+        goto exit;
+    }
+    if (strlen(name) != (size_t)name_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
+    return_value = _multiprocessing_sem_unlink_impl(module, name);
+
+exit:
+    return return_value;
+}
+
+#ifndef _MULTIPROCESSING_CLOSESOCKET_METHODDEF
+    #define _MULTIPROCESSING_CLOSESOCKET_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_CLOSESOCKET_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_RECV_METHODDEF
+    #define _MULTIPROCESSING_RECV_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_RECV_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEND_METHODDEF
+    #define _MULTIPROCESSING_SEND_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEND_METHODDEF) */
+/*[clinic end generated code: output=4a6afc67c1f5ec85 input=a9049054013a1b77]*/
diff --git a/contrib/tools/python3/Modules/_multiprocessing/clinic/posixshmem.c.h b/contrib/tools/python3/Modules/_multiprocessing/clinic/posixshmem.c.h
new file mode 100644
index 00000000000..df2aa29cfe6
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/clinic/posixshmem.c.h
@@ -0,0 +1,175 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+#  include "pycore_gc.h"            // PyGC_Head
+#  include "pycore_runtime.h"       // _Py_ID()
+#endif
+
+
+#if defined(HAVE_SHM_OPEN)
+
+PyDoc_STRVAR(_posixshmem_shm_open__doc__,
+"shm_open($module, /, path, flags, mode=511)\n"
+"--\n"
+"\n"
+"Open a shared memory object.  Returns a file descriptor (integer).");
+
+#define _POSIXSHMEM_SHM_OPEN_METHODDEF    \
+    {"shm_open", _PyCFunction_CAST(_posixshmem_shm_open), METH_FASTCALL|METH_KEYWORDS, _posixshmem_shm_open__doc__},
+
+static int
+_posixshmem_shm_open_impl(PyObject *module, PyObject *path, int flags,
+                          int mode);
+
+static PyObject *
+_posixshmem_shm_open(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 3
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(path), &_Py_ID(flags), &_Py_ID(mode), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"path", "flags", "mode", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "shm_open",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 2;
+    PyObject *path;
+    int flags;
+    int mode = 511;
+    int _return_value;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 2, 3, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!PyUnicode_Check(args[0])) {
+        _PyArg_BadArgument("shm_open", "argument 'path'", "str", args[0]);
+        goto exit;
+    }
+    if (PyUnicode_READY(args[0]) == -1) {
+        goto exit;
+    }
+    path = args[0];
+    flags = _PyLong_AsInt(args[1]);
+    if (flags == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    mode = _PyLong_AsInt(args[2]);
+    if (mode == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+skip_optional_pos:
+    _return_value = _posixshmem_shm_open_impl(module, path, flags, mode);
+    if ((_return_value == -1) && PyErr_Occurred()) {
+        goto exit;
+    }
+    return_value = PyLong_FromLong((long)_return_value);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_SHM_OPEN) */
+
+#if defined(HAVE_SHM_UNLINK)
+
+PyDoc_STRVAR(_posixshmem_shm_unlink__doc__,
+"shm_unlink($module, /, path)\n"
+"--\n"
+"\n"
+"Remove a shared memory object (similar to unlink()).\n"
+"\n"
+"Remove a shared memory object name, and, once all processes  have  unmapped\n"
+"the object, de-allocates and destroys the contents of the associated memory\n"
+"region.");
+
+#define _POSIXSHMEM_SHM_UNLINK_METHODDEF    \
+    {"shm_unlink", _PyCFunction_CAST(_posixshmem_shm_unlink), METH_FASTCALL|METH_KEYWORDS, _posixshmem_shm_unlink__doc__},
+
+static PyObject *
+_posixshmem_shm_unlink_impl(PyObject *module, PyObject *path);
+
+static PyObject *
+_posixshmem_shm_unlink(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 1
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(path), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"path", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "shm_unlink",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    PyObject *path;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 1, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!PyUnicode_Check(args[0])) {
+        _PyArg_BadArgument("shm_unlink", "argument 'path'", "str", args[0]);
+        goto exit;
+    }
+    if (PyUnicode_READY(args[0]) == -1) {
+        goto exit;
+    }
+    path = args[0];
+    return_value = _posixshmem_shm_unlink_impl(module, path);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_SHM_UNLINK) */
+
+#ifndef _POSIXSHMEM_SHM_OPEN_METHODDEF
+    #define _POSIXSHMEM_SHM_OPEN_METHODDEF
+#endif /* !defined(_POSIXSHMEM_SHM_OPEN_METHODDEF) */
+
+#ifndef _POSIXSHMEM_SHM_UNLINK_METHODDEF
+    #define _POSIXSHMEM_SHM_UNLINK_METHODDEF
+#endif /* !defined(_POSIXSHMEM_SHM_UNLINK_METHODDEF) */
+/*[clinic end generated code: output=3f6fee283d5fd0e9 input=a9049054013a1b77]*/
diff --git a/contrib/tools/python3/Modules/_multiprocessing/clinic/semaphore.c.h b/contrib/tools/python3/Modules/_multiprocessing/clinic/semaphore.c.h
new file mode 100644
index 00000000000..35347169bc1
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/clinic/semaphore.c.h
@@ -0,0 +1,545 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+#  include "pycore_gc.h"            // PyGC_Head
+#  include "pycore_runtime.h"       // _Py_ID()
+#endif
+
+
+#if defined(HAVE_MP_SEMAPHORE) && defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_SemLock_acquire__doc__,
+"acquire($self, /, block=True, timeout=None)\n"
+"--\n"
+"\n"
+"Acquire the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF    \
+    {"acquire", _PyCFunction_CAST(_multiprocessing_SemLock_acquire), METH_FASTCALL|METH_KEYWORDS, _multiprocessing_SemLock_acquire__doc__},
+
+static PyObject *
+_multiprocessing_SemLock_acquire_impl(SemLockObject *self, int blocking,
+                                      PyObject *timeout_obj);
+
+static PyObject *
+_multiprocessing_SemLock_acquire(SemLockObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 2
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(block), &_Py_ID(timeout), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"block", "timeout", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "acquire",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[2];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 0;
+    int blocking = 1;
+    PyObject *timeout_obj = Py_None;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 0, 2, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    if (args[0]) {
+        blocking = PyObject_IsTrue(args[0]);
+        if (blocking < 0) {
+            goto exit;
+        }
+        if (!--noptargs) {
+            goto skip_optional_pos;
+        }
+    }
+    timeout_obj = args[1];
+skip_optional_pos:
+    return_value = _multiprocessing_SemLock_acquire_impl(self, blocking, timeout_obj);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) && defined(MS_WINDOWS) */
+
+#if defined(HAVE_MP_SEMAPHORE) && defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_SemLock_release__doc__,
+"release($self, /)\n"
+"--\n"
+"\n"
+"Release the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF    \
+    {"release", (PyCFunction)_multiprocessing_SemLock_release, METH_NOARGS, _multiprocessing_SemLock_release__doc__},
+
+static PyObject *
+_multiprocessing_SemLock_release_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock_release(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock_release_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) && defined(MS_WINDOWS) */
+
+#if defined(HAVE_MP_SEMAPHORE) && !defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_SemLock_acquire__doc__,
+"acquire($self, /, block=True, timeout=None)\n"
+"--\n"
+"\n"
+"Acquire the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF    \
+    {"acquire", _PyCFunction_CAST(_multiprocessing_SemLock_acquire), METH_FASTCALL|METH_KEYWORDS, _multiprocessing_SemLock_acquire__doc__},
+
+static PyObject *
+_multiprocessing_SemLock_acquire_impl(SemLockObject *self, int blocking,
+                                      PyObject *timeout_obj);
+
+static PyObject *
+_multiprocessing_SemLock_acquire(SemLockObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 2
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(block), &_Py_ID(timeout), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"block", "timeout", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "acquire",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[2];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 0;
+    int blocking = 1;
+    PyObject *timeout_obj = Py_None;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 0, 2, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    if (args[0]) {
+        blocking = PyObject_IsTrue(args[0]);
+        if (blocking < 0) {
+            goto exit;
+        }
+        if (!--noptargs) {
+            goto skip_optional_pos;
+        }
+    }
+    timeout_obj = args[1];
+skip_optional_pos:
+    return_value = _multiprocessing_SemLock_acquire_impl(self, blocking, timeout_obj);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) && !defined(MS_WINDOWS) */
+
+#if defined(HAVE_MP_SEMAPHORE) && !defined(MS_WINDOWS)
+
+PyDoc_STRVAR(_multiprocessing_SemLock_release__doc__,
+"release($self, /)\n"
+"--\n"
+"\n"
+"Release the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF    \
+    {"release", (PyCFunction)_multiprocessing_SemLock_release, METH_NOARGS, _multiprocessing_SemLock_release__doc__},
+
+static PyObject *
+_multiprocessing_SemLock_release_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock_release(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock_release_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) && !defined(MS_WINDOWS) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+static PyObject *
+_multiprocessing_SemLock_impl(PyTypeObject *type, int kind, int value,
+                              int maxvalue, const char *name, int unlink);
+
+static PyObject *
+_multiprocessing_SemLock(PyTypeObject *type, PyObject *args, PyObject *kwargs)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 5
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(kind), &_Py_ID(value), &_Py_ID(maxvalue), &_Py_ID(name), &_Py_ID(unlink), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"kind", "value", "maxvalue", "name", "unlink", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "SemLock",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[5];
+    PyObject * const *fastargs;
+    Py_ssize_t nargs = PyTuple_GET_SIZE(args);
+    int kind;
+    int value;
+    int maxvalue;
+    const char *name;
+    int unlink;
+
+    fastargs = _PyArg_UnpackKeywords(_PyTuple_CAST(args)->ob_item, nargs, kwargs, NULL, &_parser, 5, 5, 0, argsbuf);
+    if (!fastargs) {
+        goto exit;
+    }
+    kind = _PyLong_AsInt(fastargs[0]);
+    if (kind == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    value = _PyLong_AsInt(fastargs[1]);
+    if (value == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    maxvalue = _PyLong_AsInt(fastargs[2]);
+    if (maxvalue == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    if (!PyUnicode_Check(fastargs[3])) {
+        _PyArg_BadArgument("SemLock", "argument 'name'", "str", fastargs[3]);
+        goto exit;
+    }
+    Py_ssize_t name_length;
+    name = PyUnicode_AsUTF8AndSize(fastargs[3], &name_length);
+    if (name == NULL) {
+        goto exit;
+    }
+    if (strlen(name) != (size_t)name_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
+    unlink = PyObject_IsTrue(fastargs[4]);
+    if (unlink < 0) {
+        goto exit;
+    }
+    return_value = _multiprocessing_SemLock_impl(type, kind, value, maxvalue, name, unlink);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__rebuild__doc__,
+"_rebuild($type, handle, kind, maxvalue, name, /)\n"
+"--\n"
+"\n");
+
+#define _MULTIPROCESSING_SEMLOCK__REBUILD_METHODDEF    \
+    {"_rebuild", _PyCFunction_CAST(_multiprocessing_SemLock__rebuild), METH_FASTCALL|METH_CLASS, _multiprocessing_SemLock__rebuild__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__rebuild_impl(PyTypeObject *type, SEM_HANDLE handle,
+                                       int kind, int maxvalue,
+                                       const char *name);
+
+static PyObject *
+_multiprocessing_SemLock__rebuild(PyTypeObject *type, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    SEM_HANDLE handle;
+    int kind;
+    int maxvalue;
+    const char *name;
+
+    if (!_PyArg_ParseStack(args, nargs, ""F_SEM_HANDLE"iiz:_rebuild",
+        &handle, &kind, &maxvalue, &name)) {
+        goto exit;
+    }
+    return_value = _multiprocessing_SemLock__rebuild_impl(type, handle, kind, maxvalue, name);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__count__doc__,
+"_count($self, /)\n"
+"--\n"
+"\n"
+"Num of `acquire()`s minus num of `release()`s for this process.");
+
+#define _MULTIPROCESSING_SEMLOCK__COUNT_METHODDEF    \
+    {"_count", (PyCFunction)_multiprocessing_SemLock__count, METH_NOARGS, _multiprocessing_SemLock__count__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__count_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock__count(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock__count_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__is_mine__doc__,
+"_is_mine($self, /)\n"
+"--\n"
+"\n"
+"Whether the lock is owned by this thread.");
+
+#define _MULTIPROCESSING_SEMLOCK__IS_MINE_METHODDEF    \
+    {"_is_mine", (PyCFunction)_multiprocessing_SemLock__is_mine, METH_NOARGS, _multiprocessing_SemLock__is_mine__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__is_mine_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock__is_mine(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock__is_mine_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__get_value__doc__,
+"_get_value($self, /)\n"
+"--\n"
+"\n"
+"Get the value of the semaphore.");
+
+#define _MULTIPROCESSING_SEMLOCK__GET_VALUE_METHODDEF    \
+    {"_get_value", (PyCFunction)_multiprocessing_SemLock__get_value, METH_NOARGS, _multiprocessing_SemLock__get_value__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__get_value_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock__get_value(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock__get_value_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__is_zero__doc__,
+"_is_zero($self, /)\n"
+"--\n"
+"\n"
+"Return whether semaphore has value zero.");
+
+#define _MULTIPROCESSING_SEMLOCK__IS_ZERO_METHODDEF    \
+    {"_is_zero", (PyCFunction)_multiprocessing_SemLock__is_zero, METH_NOARGS, _multiprocessing_SemLock__is_zero__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__is_zero_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock__is_zero(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock__is_zero_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock__after_fork__doc__,
+"_after_fork($self, /)\n"
+"--\n"
+"\n"
+"Rezero the net acquisition count after fork().");
+
+#define _MULTIPROCESSING_SEMLOCK__AFTER_FORK_METHODDEF    \
+    {"_after_fork", (PyCFunction)_multiprocessing_SemLock__after_fork, METH_NOARGS, _multiprocessing_SemLock__after_fork__doc__},
+
+static PyObject *
+_multiprocessing_SemLock__after_fork_impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock__after_fork(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock__after_fork_impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock___enter____doc__,
+"__enter__($self, /)\n"
+"--\n"
+"\n"
+"Enter the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK___ENTER___METHODDEF    \
+    {"__enter__", (PyCFunction)_multiprocessing_SemLock___enter__, METH_NOARGS, _multiprocessing_SemLock___enter____doc__},
+
+static PyObject *
+_multiprocessing_SemLock___enter___impl(SemLockObject *self);
+
+static PyObject *
+_multiprocessing_SemLock___enter__(SemLockObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return _multiprocessing_SemLock___enter___impl(self);
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#if defined(HAVE_MP_SEMAPHORE)
+
+PyDoc_STRVAR(_multiprocessing_SemLock___exit____doc__,
+"__exit__($self, exc_type=None, exc_value=None, exc_tb=None, /)\n"
+"--\n"
+"\n"
+"Exit the semaphore/lock.");
+
+#define _MULTIPROCESSING_SEMLOCK___EXIT___METHODDEF    \
+    {"__exit__", _PyCFunction_CAST(_multiprocessing_SemLock___exit__), METH_FASTCALL, _multiprocessing_SemLock___exit____doc__},
+
+static PyObject *
+_multiprocessing_SemLock___exit___impl(SemLockObject *self,
+                                       PyObject *exc_type,
+                                       PyObject *exc_value, PyObject *exc_tb);
+
+static PyObject *
+_multiprocessing_SemLock___exit__(SemLockObject *self, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    PyObject *exc_type = Py_None;
+    PyObject *exc_value = Py_None;
+    PyObject *exc_tb = Py_None;
+
+    if (!_PyArg_CheckPositional("__exit__", nargs, 0, 3)) {
+        goto exit;
+    }
+    if (nargs < 1) {
+        goto skip_optional;
+    }
+    exc_type = args[0];
+    if (nargs < 2) {
+        goto skip_optional;
+    }
+    exc_value = args[1];
+    if (nargs < 3) {
+        goto skip_optional;
+    }
+    exc_tb = args[2];
+skip_optional:
+    return_value = _multiprocessing_SemLock___exit___impl(self, exc_type, exc_value, exc_tb);
+
+exit:
+    return return_value;
+}
+
+#endif /* defined(HAVE_MP_SEMAPHORE) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__REBUILD_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__REBUILD_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__REBUILD_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__COUNT_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__COUNT_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__COUNT_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__IS_MINE_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__IS_MINE_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__IS_MINE_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__GET_VALUE_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__GET_VALUE_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__GET_VALUE_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__IS_ZERO_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__IS_ZERO_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__IS_ZERO_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK__AFTER_FORK_METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK__AFTER_FORK_METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK__AFTER_FORK_METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK___ENTER___METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK___ENTER___METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK___ENTER___METHODDEF) */
+
+#ifndef _MULTIPROCESSING_SEMLOCK___EXIT___METHODDEF
+    #define _MULTIPROCESSING_SEMLOCK___EXIT___METHODDEF
+#endif /* !defined(_MULTIPROCESSING_SEMLOCK___EXIT___METHODDEF) */
+/*[clinic end generated code: output=dae57a702cc01512 input=a9049054013a1b77]*/
diff --git a/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.c b/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.c
new file mode 100644
index 00000000000..8f9daa5c3de
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.c
@@ -0,0 +1,295 @@
+/*
+ * Extension module used by multiprocessing package
+ *
+ * multiprocessing.c
+ *
+ * Copyright (c) 2006-2008, R Oudkerk
+ * Licensed to PSF under a Contributor Agreement.
+ */
+
+#include "multiprocessing.h"
+
+/*[python input]
+class HANDLE_converter(CConverter):
+    type = "HANDLE"
+    format_unit = '"F_HANDLE"'
+
+    def parse_arg(self, argname, displayname):
+        return """
+            {paramname} = PyLong_AsVoidPtr({argname});
+            if (!{paramname} && PyErr_Occurred()) {{{{
+                goto exit;
+            }}}}
+            """.format(argname=argname, paramname=self.parser_name)
+
+[python start generated code]*/
+/*[python end generated code: output=da39a3ee5e6b4b0d input=3e537d244034affb]*/
+
+/*[clinic input]
+module _multiprocessing
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=01e0745f380ac6e3]*/
+
+#include "clinic/multiprocessing.c.h"
+
+/*
+ * Function which raises exceptions based on error codes
+ */
+
+PyObject *
+_PyMp_SetError(PyObject *Type, int num)
+{
+    switch (num) {
+#ifdef MS_WINDOWS
+    case MP_STANDARD_ERROR:
+        if (Type == NULL)
+            Type = PyExc_OSError;
+        PyErr_SetExcFromWindowsErr(Type, 0);
+        break;
+    case MP_SOCKET_ERROR:
+        if (Type == NULL)
+            Type = PyExc_OSError;
+        PyErr_SetExcFromWindowsErr(Type, WSAGetLastError());
+        break;
+#else /* !MS_WINDOWS */
+    case MP_STANDARD_ERROR:
+    case MP_SOCKET_ERROR:
+        if (Type == NULL)
+            Type = PyExc_OSError;
+        PyErr_SetFromErrno(Type);
+        break;
+#endif /* !MS_WINDOWS */
+    case MP_MEMORY_ERROR:
+        PyErr_NoMemory();
+        break;
+    case MP_EXCEPTION_HAS_BEEN_SET:
+        break;
+    default:
+        PyErr_Format(PyExc_RuntimeError,
+                     "unknown error number %d", num);
+    }
+    return NULL;
+}
+
+#ifdef MS_WINDOWS
+/*[clinic input]
+_multiprocessing.closesocket
+
+    handle: HANDLE
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_closesocket_impl(PyObject *module, HANDLE handle)
+/*[clinic end generated code: output=214f359f900966f4 input=8a20706dd386c6cc]*/
+{
+    int ret;
+
+    Py_BEGIN_ALLOW_THREADS
+    ret = closesocket((SOCKET) handle);
+    Py_END_ALLOW_THREADS
+
+    if (ret)
+        return PyErr_SetExcFromWindowsErr(PyExc_OSError, WSAGetLastError());
+    Py_RETURN_NONE;
+}
+
+/*[clinic input]
+_multiprocessing.recv
+
+    handle: HANDLE
+    size: int
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_recv_impl(PyObject *module, HANDLE handle, int size)
+/*[clinic end generated code: output=92322781ba9ff598 input=6a5b0834372cee5b]*/
+{
+    int nread;
+    PyObject *buf;
+
+    buf = PyBytes_FromStringAndSize(NULL, size);
+    if (!buf)
+        return NULL;
+
+    Py_BEGIN_ALLOW_THREADS
+    nread = recv((SOCKET) handle, PyBytes_AS_STRING(buf), size, 0);
+    Py_END_ALLOW_THREADS
+
+    if (nread < 0) {
+        Py_DECREF(buf);
+        return PyErr_SetExcFromWindowsErr(PyExc_OSError, WSAGetLastError());
+    }
+    _PyBytes_Resize(&buf, nread);
+    return buf;
+}
+
+/*[clinic input]
+_multiprocessing.send
+
+    handle: HANDLE
+    buf: Py_buffer
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_send_impl(PyObject *module, HANDLE handle, Py_buffer *buf)
+/*[clinic end generated code: output=52d7df0519c596cb input=41dce742f98d2210]*/
+{
+    int ret, length;
+
+    length = (int)Py_MIN(buf->len, INT_MAX);
+
+    Py_BEGIN_ALLOW_THREADS
+    ret = send((SOCKET) handle, buf->buf, length, 0);
+    Py_END_ALLOW_THREADS
+
+    if (ret < 0)
+        return PyErr_SetExcFromWindowsErr(PyExc_OSError, WSAGetLastError());
+    return PyLong_FromLong(ret);
+}
+
+#endif
+
+/*[clinic input]
+_multiprocessing.sem_unlink
+
+    name: str
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_sem_unlink_impl(PyObject *module, const char *name)
+/*[clinic end generated code: output=fcbfeb1ed255e647 input=bf939aff9564f1d5]*/
+{
+    return _PyMp_sem_unlink(name);
+}
+
+/*
+ * Function table
+ */
+
+static PyMethodDef module_methods[] = {
+#ifdef MS_WINDOWS
+    _MULTIPROCESSING_CLOSESOCKET_METHODDEF
+    _MULTIPROCESSING_RECV_METHODDEF
+    _MULTIPROCESSING_SEND_METHODDEF
+#endif
+#if !defined(POSIX_SEMAPHORES_NOT_ENABLED) && !defined(__ANDROID__)
+    _MULTIPROCESSING_SEM_UNLINK_METHODDEF
+#endif
+    {NULL}
+};
+
+
+/*
+ * Initialize
+ */
+
+static int
+multiprocessing_exec(PyObject *module)
+{
+#ifdef HAVE_MP_SEMAPHORE
+
+    PyTypeObject *semlock_type = (PyTypeObject *)PyType_FromModuleAndSpec(
+                module, &_PyMp_SemLockType_spec, NULL);
+
+    if (semlock_type == NULL) {
+        return -1;
+    }
+    int rc = PyModule_AddType(module, semlock_type);
+    Py_DECREF(semlock_type);
+    if (rc < 0) {
+        return -1;
+    }
+
+    PyObject *py_sem_value_max;
+    /* Some systems define SEM_VALUE_MAX as an unsigned value that
+     * causes it to be negative when used as an int (NetBSD).
+     *
+     * Issue #28152: Use (0) instead of 0 to fix a warning on dead code
+     * when using clang -Wunreachable-code. */
+    if ((int)(SEM_VALUE_MAX) < (0)) {
+        py_sem_value_max = PyLong_FromLong(INT_MAX);
+    }
+    else {
+        py_sem_value_max = PyLong_FromLong(SEM_VALUE_MAX);
+    }
+    if (py_sem_value_max == NULL) {
+        return -1;
+    }
+    if (PyDict_SetItemString(semlock_type->tp_dict, "SEM_VALUE_MAX",
+                         py_sem_value_max) < 0) {
+        Py_DECREF(py_sem_value_max);
+        return -1;
+    }
+    Py_DECREF(py_sem_value_max);
+
+#endif
+
+    /* Add configuration macros */
+    PyObject *flags = PyDict_New();
+    if (!flags) {
+        return -1;
+    }
+
+#define ADD_FLAG(name)                                          \
+    do {                                                        \
+        PyObject *value = PyLong_FromLong(name);                \
+        if (value == NULL) {                                    \
+            Py_DECREF(flags);                                   \
+            return -1;                                          \
+        }                                                       \
+        if (PyDict_SetItemString(flags, #name, value) < 0) {    \
+            Py_DECREF(flags);                                   \
+            Py_DECREF(value);                                   \
+            return -1;                                          \
+        }                                                       \
+        Py_DECREF(value);                                       \
+    } while (0)
+
+#if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
+    ADD_FLAG(HAVE_SEM_OPEN);
+#endif
+#ifdef HAVE_SEM_TIMEDWAIT
+    ADD_FLAG(HAVE_SEM_TIMEDWAIT);
+#endif
+#ifdef HAVE_BROKEN_SEM_GETVALUE
+    ADD_FLAG(HAVE_BROKEN_SEM_GETVALUE);
+#endif
+#ifdef HAVE_BROKEN_SEM_UNLINK
+    ADD_FLAG(HAVE_BROKEN_SEM_UNLINK);
+#endif
+
+    if (PyModule_AddObject(module, "flags", flags) < 0) {
+        Py_DECREF(flags);
+        return -1;
+    }
+
+    return 0;
+}
+
+static PyModuleDef_Slot multiprocessing_slots[] = {
+    {Py_mod_exec, multiprocessing_exec},
+    {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
+    {0, NULL}
+};
+
+static struct PyModuleDef multiprocessing_module = {
+    PyModuleDef_HEAD_INIT,
+    .m_name = "_multiprocessing",
+    .m_size = 0,
+    .m_methods = module_methods,
+    .m_slots = multiprocessing_slots,
+};
+
+PyMODINIT_FUNC
+PyInit__multiprocessing(void)
+{
+    return PyModuleDef_Init(&multiprocessing_module);
+}
diff --git a/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.h b/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.h
new file mode 100644
index 00000000000..dfc2a8e0799
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/multiprocessing.h
@@ -0,0 +1,97 @@
+#ifndef MULTIPROCESSING_H
+#define MULTIPROCESSING_H
+
+#define PY_SSIZE_T_CLEAN
+
+#include "Python.h"
+#include "structmember.h"
+#include "pythread.h"
+
+/*
+ * Platform includes and definitions
+ */
+
+#ifdef MS_WINDOWS
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  include <windows.h>
+#  include <winsock2.h>
+#  include <process.h>               /* getpid() */
+#  ifdef Py_DEBUG
+#    include <crtdbg.h>
+#  endif
+#  define SEM_HANDLE HANDLE
+#  define SEM_VALUE_MAX LONG_MAX
+#  define HAVE_MP_SEMAPHORE
+#else
+#  include <fcntl.h>                 /* O_CREAT and O_EXCL */
+#  if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
+#    define HAVE_MP_SEMAPHORE
+#    include <semaphore.h>
+     typedef sem_t *SEM_HANDLE;
+#  endif
+#endif
+
+/*
+ * Issue 3110 - Solaris does not define SEM_VALUE_MAX
+ */
+#ifndef SEM_VALUE_MAX
+    #if defined(HAVE_SYSCONF) && defined(_SC_SEM_VALUE_MAX)
+        # define SEM_VALUE_MAX sysconf(_SC_SEM_VALUE_MAX)
+    #elif defined(_SEM_VALUE_MAX)
+        # define SEM_VALUE_MAX _SEM_VALUE_MAX
+    #elif defined(_POSIX_SEM_VALUE_MAX)
+        # define SEM_VALUE_MAX _POSIX_SEM_VALUE_MAX
+    #else
+        # define SEM_VALUE_MAX INT_MAX
+    #endif
+#endif
+
+
+/*
+ * Format codes
+ */
+
+#if SIZEOF_VOID_P == SIZEOF_LONG
+#  define F_POINTER "k"
+#  define T_POINTER T_ULONG
+#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
+#  define F_POINTER "K"
+#  define T_POINTER T_ULONGLONG
+#else
+#  error "can't find format code for unsigned integer of same size as void*"
+#endif
+
+#ifdef MS_WINDOWS
+#  define F_HANDLE F_POINTER
+#  define T_HANDLE T_POINTER
+#  define F_SEM_HANDLE F_HANDLE
+#  define T_SEM_HANDLE T_HANDLE
+#else
+#  define F_HANDLE "i"
+#  define T_HANDLE T_INT
+#  define F_SEM_HANDLE F_POINTER
+#  define T_SEM_HANDLE T_POINTER
+#endif
+
+/*
+ * Error codes which can be returned by functions called without GIL
+ */
+
+#define MP_SUCCESS (0)
+#define MP_STANDARD_ERROR (-1)
+#define MP_MEMORY_ERROR (-1001)
+#define MP_SOCKET_ERROR (-1002)
+#define MP_EXCEPTION_HAS_BEEN_SET (-1003)
+
+PyObject *_PyMp_SetError(PyObject *Type, int num);
+
+/*
+ * Externs - not all will really exist on all platforms
+ */
+
+extern PyType_Spec _PyMp_SemLockType_spec;
+extern PyObject *_PyMp_sem_unlink(const char *name);
+
+#endif /* MULTIPROCESSING_H */
diff --git a/contrib/tools/python3/Modules/_multiprocessing/posixshmem.c b/contrib/tools/python3/Modules/_multiprocessing/posixshmem.c
new file mode 100644
index 00000000000..88c93fe3137
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/posixshmem.c
@@ -0,0 +1,133 @@
+/*
+posixshmem - A Python extension that provides shm_open() and shm_unlink()
+*/
+
+#define PY_SSIZE_T_CLEAN
+
+#include <Python.h>
+
+// for shm_open() and shm_unlink()
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+/*[clinic input]
+module _posixshmem
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=a416734e49164bf8]*/
+
+/*
+ *
+ * Module-level functions & meta stuff
+ *
+ */
+
+#ifdef HAVE_SHM_OPEN
+/*[clinic input]
+_posixshmem.shm_open -> int
+    path: unicode
+    flags: int
+    mode: int = 0o777
+
+# "shm_open(path, flags, mode=0o777)\n\n\
+
+Open a shared memory object.  Returns a file descriptor (integer).
+
+[clinic start generated code]*/
+
+static int
+_posixshmem_shm_open_impl(PyObject *module, PyObject *path, int flags,
+                          int mode)
+/*[clinic end generated code: output=8d110171a4fa20df input=e83b58fa802fac25]*/
+{
+    int fd;
+    int async_err = 0;
+    const char *name = PyUnicode_AsUTF8(path);
+    if (name == NULL) {
+        return -1;
+    }
+    do {
+        Py_BEGIN_ALLOW_THREADS
+        fd = shm_open(name, flags, mode);
+        Py_END_ALLOW_THREADS
+    } while (fd < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+
+    if (fd < 0) {
+        if (!async_err)
+            PyErr_SetFromErrnoWithFilenameObject(PyExc_OSError, path);
+        return -1;
+    }
+
+    return fd;
+}
+#endif /* HAVE_SHM_OPEN */
+
+#ifdef HAVE_SHM_UNLINK
+/*[clinic input]
+_posixshmem.shm_unlink
+    path: unicode
+
+Remove a shared memory object (similar to unlink()).
+
+Remove a shared memory object name, and, once all processes  have  unmapped
+the object, de-allocates and destroys the contents of the associated memory
+region.
+
+[clinic start generated code]*/
+
+static PyObject *
+_posixshmem_shm_unlink_impl(PyObject *module, PyObject *path)
+/*[clinic end generated code: output=42f8b23d134b9ff5 input=8dc0f87143e3b300]*/
+{
+    int rv;
+    int async_err = 0;
+    const char *name = PyUnicode_AsUTF8(path);
+    if (name == NULL) {
+        return NULL;
+    }
+    do {
+        Py_BEGIN_ALLOW_THREADS
+        rv = shm_unlink(name);
+        Py_END_ALLOW_THREADS
+    } while (rv < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+
+    if (rv < 0) {
+        if (!async_err)
+            PyErr_SetFromErrnoWithFilenameObject(PyExc_OSError, path);
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+#endif /* HAVE_SHM_UNLINK */
+
+#include "clinic/posixshmem.c.h"
+
+static PyMethodDef module_methods[ ] = {
+    _POSIXSHMEM_SHM_OPEN_METHODDEF
+    _POSIXSHMEM_SHM_UNLINK_METHODDEF
+    {NULL} /* Sentinel */
+};
+
+
+static PyModuleDef_Slot module_slots[] = {
+    {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
+    {0, NULL}
+};
+
+
+static struct PyModuleDef _posixshmemmodule = {
+    PyModuleDef_HEAD_INIT,
+    .m_name = "_posixshmem",
+    .m_doc = "POSIX shared memory module",
+    .m_size = 0,
+    .m_methods = module_methods,
+    .m_slots = module_slots,
+};
+
+/* Module init function */
+PyMODINIT_FUNC
+PyInit__posixshmem(void)
+{
+    return PyModuleDef_Init(&_posixshmemmodule);
+}
diff --git a/contrib/tools/python3/Modules/_multiprocessing/semaphore.c b/contrib/tools/python3/Modules/_multiprocessing/semaphore.c
new file mode 100644
index 00000000000..c7df82dfe2d
--- /dev/null
+++ b/contrib/tools/python3/Modules/_multiprocessing/semaphore.c
@@ -0,0 +1,790 @@
+/*
+ * A type which wraps a semaphore
+ *
+ * semaphore.c
+ *
+ * Copyright (c) 2006-2008, R Oudkerk
+ * Licensed to PSF under a Contributor Agreement.
+ */
+
+#include "multiprocessing.h"
+
+#ifdef HAVE_MP_SEMAPHORE
+
+enum { RECURSIVE_MUTEX, SEMAPHORE };
+
+typedef struct {
+    PyObject_HEAD
+    SEM_HANDLE handle;
+    unsigned long last_tid;
+    int count;
+    int maxvalue;
+    int kind;
+    char *name;
+} SemLockObject;
+
+/*[python input]
+class SEM_HANDLE_converter(CConverter):
+    type = "SEM_HANDLE"
+    format_unit = '"F_SEM_HANDLE"'
+
+[python start generated code]*/
+/*[python end generated code: output=da39a3ee5e6b4b0d input=3e0ad43e482d8716]*/
+
+/*[clinic input]
+module _multiprocessing
+class _multiprocessing.SemLock "SemLockObject *" "&_PyMp_SemLockType"
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=935fb41b7d032599]*/
+
+#include "clinic/semaphore.c.h"
+
+#define ISMINE(o) (o->count > 0 && PyThread_get_thread_ident() == o->last_tid)
+
+
+#ifdef MS_WINDOWS
+
+/*
+ * Windows definitions
+ */
+
+#define SEM_FAILED NULL
+
+#define SEM_CLEAR_ERROR() SetLastError(0)
+#define SEM_GET_LAST_ERROR() GetLastError()
+#define SEM_CREATE(name, val, max) CreateSemaphore(NULL, val, max, NULL)
+#define SEM_CLOSE(sem) (CloseHandle(sem) ? 0 : -1)
+#define SEM_GETVALUE(sem, pval) _GetSemaphoreValue(sem, pval)
+#define SEM_UNLINK(name) 0
+
+static int
+_GetSemaphoreValue(HANDLE handle, long *value)
+{
+    long previous;
+
+    switch (WaitForSingleObjectEx(handle, 0, FALSE)) {
+    case WAIT_OBJECT_0:
+        if (!ReleaseSemaphore(handle, 1, &previous))
+            return MP_STANDARD_ERROR;
+        *value = previous + 1;
+        return 0;
+    case WAIT_TIMEOUT:
+        *value = 0;
+        return 0;
+    default:
+        return MP_STANDARD_ERROR;
+    }
+}
+
+/*[clinic input]
+_multiprocessing.SemLock.acquire
+
+    block as blocking: bool = True
+    timeout as timeout_obj: object = None
+
+Acquire the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock_acquire_impl(SemLockObject *self, int blocking,
+                                      PyObject *timeout_obj)
+/*[clinic end generated code: output=f9998f0b6b0b0872 input=e5b45f5cbb775166]*/
+{
+    double timeout;
+    DWORD res, full_msecs, nhandles;
+    HANDLE handles[2], sigint_event;
+
+    /* calculate timeout */
+    if (!blocking) {
+        full_msecs = 0;
+    } else if (timeout_obj == Py_None) {
+        full_msecs = INFINITE;
+    } else {
+        timeout = PyFloat_AsDouble(timeout_obj);
+        if (PyErr_Occurred())
+            return NULL;
+        timeout *= 1000.0;      /* convert to millisecs */
+        if (timeout < 0.0) {
+            timeout = 0.0;
+        } else if (timeout >= 0.5 * INFINITE) { /* 25 days */
+            PyErr_SetString(PyExc_OverflowError,
+                            "timeout is too large");
+            return NULL;
+        }
+        full_msecs = (DWORD)(timeout + 0.5);
+    }
+
+    /* check whether we already own the lock */
+    if (self->kind == RECURSIVE_MUTEX && ISMINE(self)) {
+        ++self->count;
+        Py_RETURN_TRUE;
+    }
+
+    /* check whether we can acquire without releasing the GIL and blocking */
+    if (WaitForSingleObjectEx(self->handle, 0, FALSE) == WAIT_OBJECT_0) {
+        self->last_tid = GetCurrentThreadId();
+        ++self->count;
+        Py_RETURN_TRUE;
+    }
+
+    /* prepare list of handles */
+    nhandles = 0;
+    handles[nhandles++] = self->handle;
+    if (_PyOS_IsMainThread()) {
+        sigint_event = _PyOS_SigintEvent();
+        assert(sigint_event != NULL);
+        handles[nhandles++] = sigint_event;
+    }
+    else {
+        sigint_event = NULL;
+    }
+
+    /* do the wait */
+    Py_BEGIN_ALLOW_THREADS
+    if (sigint_event != NULL)
+        ResetEvent(sigint_event);
+    res = WaitForMultipleObjectsEx(nhandles, handles, FALSE, full_msecs, FALSE);
+    Py_END_ALLOW_THREADS
+
+    /* handle result */
+    switch (res) {
+    case WAIT_TIMEOUT:
+        Py_RETURN_FALSE;
+    case WAIT_OBJECT_0 + 0:
+        self->last_tid = GetCurrentThreadId();
+        ++self->count;
+        Py_RETURN_TRUE;
+    case WAIT_OBJECT_0 + 1:
+        errno = EINTR;
+        return PyErr_SetFromErrno(PyExc_OSError);
+    case WAIT_FAILED:
+        return PyErr_SetFromWindowsErr(0);
+    default:
+        PyErr_Format(PyExc_RuntimeError, "WaitForSingleObject() or "
+                     "WaitForMultipleObjects() gave unrecognized "
+                     "value %u", res);
+        return NULL;
+    }
+}
+
+/*[clinic input]
+_multiprocessing.SemLock.release
+
+Release the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock_release_impl(SemLockObject *self)
+/*[clinic end generated code: output=b22f53ba96b0d1db input=ba7e63a961885d3d]*/
+{
+    if (self->kind == RECURSIVE_MUTEX) {
+        if (!ISMINE(self)) {
+            PyErr_SetString(PyExc_AssertionError, "attempt to "
+                            "release recursive lock not owned "
+                            "by thread");
+            return NULL;
+        }
+        if (self->count > 1) {
+            --self->count;
+            Py_RETURN_NONE;
+        }
+        assert(self->count == 1);
+    }
+
+    if (!ReleaseSemaphore(self->handle, 1, NULL)) {
+        if (GetLastError() == ERROR_TOO_MANY_POSTS) {
+            PyErr_SetString(PyExc_ValueError, "semaphore or lock "
+                            "released too many times");
+            return NULL;
+        } else {
+            return PyErr_SetFromWindowsErr(0);
+        }
+    }
+
+    --self->count;
+    Py_RETURN_NONE;
+}
+
+#else /* !MS_WINDOWS */
+
+/*
+ * Unix definitions
+ */
+
+#define SEM_CLEAR_ERROR()
+#define SEM_GET_LAST_ERROR() 0
+#define SEM_CREATE(name, val, max) sem_open(name, O_CREAT | O_EXCL, 0600, val)
+#define SEM_CLOSE(sem) sem_close(sem)
+#define SEM_GETVALUE(sem, pval) sem_getvalue(sem, pval)
+#define SEM_UNLINK(name) sem_unlink(name)
+
+/* OS X 10.4 defines SEM_FAILED as -1 instead of (sem_t *)-1;  this gives
+   compiler warnings, and (potentially) undefined behaviour. */
+#ifdef __APPLE__
+#  undef SEM_FAILED
+#  define SEM_FAILED ((sem_t *)-1)
+#endif
+
+#ifndef HAVE_SEM_UNLINK
+#  define sem_unlink(name) 0
+#endif
+
+#ifndef HAVE_SEM_TIMEDWAIT
+#  define sem_timedwait(sem,deadline) sem_timedwait_save(sem,deadline,_save)
+
+static int
+sem_timedwait_save(sem_t *sem, struct timespec *deadline, PyThreadState *_save)
+{
+    int res;
+    unsigned long delay, difference;
+    struct timeval now, tvdeadline, tvdelay;
+
+    errno = 0;
+    tvdeadline.tv_sec = deadline->tv_sec;
+    tvdeadline.tv_usec = deadline->tv_nsec / 1000;
+
+    for (delay = 0 ; ; delay += 1000) {
+        /* poll */
+        if (sem_trywait(sem) == 0)
+            return 0;
+        else if (errno != EAGAIN)
+            return MP_STANDARD_ERROR;
+
+        /* get current time */
+        if (gettimeofday(&now, NULL) < 0)
+            return MP_STANDARD_ERROR;
+
+        /* check for timeout */
+        if (tvdeadline.tv_sec < now.tv_sec ||
+            (tvdeadline.tv_sec == now.tv_sec &&
+             tvdeadline.tv_usec <= now.tv_usec)) {
+            errno = ETIMEDOUT;
+            return MP_STANDARD_ERROR;
+        }
+
+        /* calculate how much time is left */
+        difference = (tvdeadline.tv_sec - now.tv_sec) * 1000000 +
+            (tvdeadline.tv_usec - now.tv_usec);
+
+        /* check delay not too long -- maximum is 20 msecs */
+        if (delay > 20000)
+            delay = 20000;
+        if (delay > difference)
+            delay = difference;
+
+        /* sleep */
+        tvdelay.tv_sec = delay / 1000000;
+        tvdelay.tv_usec = delay % 1000000;
+        if (select(0, NULL, NULL, NULL, &tvdelay) < 0)
+            return MP_STANDARD_ERROR;
+
+        /* check for signals */
+        Py_BLOCK_THREADS
+        res = PyErr_CheckSignals();
+        Py_UNBLOCK_THREADS
+
+        if (res) {
+            errno = EINTR;
+            return MP_EXCEPTION_HAS_BEEN_SET;
+        }
+    }
+}
+
+#endif /* !HAVE_SEM_TIMEDWAIT */
+
+/*[clinic input]
+_multiprocessing.SemLock.acquire
+
+    block as blocking: bool = True
+    timeout as timeout_obj: object = None
+
+Acquire the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock_acquire_impl(SemLockObject *self, int blocking,
+                                      PyObject *timeout_obj)
+/*[clinic end generated code: output=f9998f0b6b0b0872 input=e5b45f5cbb775166]*/
+{
+    int res, err = 0;
+    struct timespec deadline = {0};
+
+    if (self->kind == RECURSIVE_MUTEX && ISMINE(self)) {
+        ++self->count;
+        Py_RETURN_TRUE;
+    }
+
+    int use_deadline = (timeout_obj != Py_None);
+    if (use_deadline) {
+        double timeout = PyFloat_AsDouble(timeout_obj);
+        if (PyErr_Occurred()) {
+            return NULL;
+        }
+        if (timeout < 0.0) {
+            timeout = 0.0;
+        }
+
+        struct timeval now;
+        if (gettimeofday(&now, NULL) < 0) {
+            PyErr_SetFromErrno(PyExc_OSError);
+            return NULL;
+        }
+        long sec = (long) timeout;
+        long nsec = (long) (1e9 * (timeout - sec) + 0.5);
+        deadline.tv_sec = now.tv_sec + sec;
+        deadline.tv_nsec = now.tv_usec * 1000 + nsec;
+        deadline.tv_sec += (deadline.tv_nsec / 1000000000);
+        deadline.tv_nsec %= 1000000000;
+    }
+
+    /* Check whether we can acquire without releasing the GIL and blocking */
+    do {
+        res = sem_trywait(self->handle);
+        err = errno;
+    } while (res < 0 && errno == EINTR && !PyErr_CheckSignals());
+    errno = err;
+
+    if (res < 0 && errno == EAGAIN && blocking) {
+        /* Couldn't acquire immediately, need to block */
+        do {
+            Py_BEGIN_ALLOW_THREADS
+            if (!use_deadline) {
+                res = sem_wait(self->handle);
+            }
+            else {
+                res = sem_timedwait(self->handle, &deadline);
+            }
+            Py_END_ALLOW_THREADS
+            err = errno;
+            if (res == MP_EXCEPTION_HAS_BEEN_SET)
+                break;
+        } while (res < 0 && errno == EINTR && !PyErr_CheckSignals());
+    }
+
+    if (res < 0) {
+        errno = err;
+        if (errno == EAGAIN || errno == ETIMEDOUT)
+            Py_RETURN_FALSE;
+        else if (errno == EINTR)
+            return NULL;
+        else
+            return PyErr_SetFromErrno(PyExc_OSError);
+    }
+
+    ++self->count;
+    self->last_tid = PyThread_get_thread_ident();
+
+    Py_RETURN_TRUE;
+}
+
+/*[clinic input]
+_multiprocessing.SemLock.release
+
+Release the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock_release_impl(SemLockObject *self)
+/*[clinic end generated code: output=b22f53ba96b0d1db input=ba7e63a961885d3d]*/
+{
+    if (self->kind == RECURSIVE_MUTEX) {
+        if (!ISMINE(self)) {
+            PyErr_SetString(PyExc_AssertionError, "attempt to "
+                            "release recursive lock not owned "
+                            "by thread");
+            return NULL;
+        }
+        if (self->count > 1) {
+            --self->count;
+            Py_RETURN_NONE;
+        }
+        assert(self->count == 1);
+    } else {
+#ifdef HAVE_BROKEN_SEM_GETVALUE
+        /* We will only check properly the maxvalue == 1 case */
+        if (self->maxvalue == 1) {
+            /* make sure that already locked */
+            if (sem_trywait(self->handle) < 0) {
+                if (errno != EAGAIN) {
+                    PyErr_SetFromErrno(PyExc_OSError);
+                    return NULL;
+                }
+                /* it is already locked as expected */
+            } else {
+                /* it was not locked so undo wait and raise  */
+                if (sem_post(self->handle) < 0) {
+                    PyErr_SetFromErrno(PyExc_OSError);
+                    return NULL;
+                }
+                PyErr_SetString(PyExc_ValueError, "semaphore "
+                                "or lock released too many "
+                                "times");
+                return NULL;
+            }
+        }
+#else
+        int sval;
+
+        /* This check is not an absolute guarantee that the semaphore
+           does not rise above maxvalue. */
+        if (sem_getvalue(self->handle, &sval) < 0) {
+            return PyErr_SetFromErrno(PyExc_OSError);
+        } else if (sval >= self->maxvalue) {
+            PyErr_SetString(PyExc_ValueError, "semaphore or lock "
+                            "released too many times");
+            return NULL;
+        }
+#endif
+    }
+
+    if (sem_post(self->handle) < 0)
+        return PyErr_SetFromErrno(PyExc_OSError);
+
+    --self->count;
+    Py_RETURN_NONE;
+}
+
+#endif /* !MS_WINDOWS */
+
+/*
+ * All platforms
+ */
+
+static PyObject *
+newsemlockobject(PyTypeObject *type, SEM_HANDLE handle, int kind, int maxvalue,
+                 char *name)
+{
+    SemLockObject *self = (SemLockObject *)type->tp_alloc(type, 0);
+    if (!self)
+        return NULL;
+    self->handle = handle;
+    self->kind = kind;
+    self->count = 0;
+    self->last_tid = 0;
+    self->maxvalue = maxvalue;
+    self->name = name;
+    return (PyObject*)self;
+}
+
+/*[clinic input]
+@classmethod
+_multiprocessing.SemLock.__new__
+
+    kind: int
+    value: int
+    maxvalue: int
+    name: str
+    unlink: bool
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock_impl(PyTypeObject *type, int kind, int value,
+                              int maxvalue, const char *name, int unlink)
+/*[clinic end generated code: output=30727e38f5f7577a input=fdaeb69814471c5b]*/
+{
+    SEM_HANDLE handle = SEM_FAILED;
+    PyObject *result;
+    char *name_copy = NULL;
+
+    if (kind != RECURSIVE_MUTEX && kind != SEMAPHORE) {
+        PyErr_SetString(PyExc_ValueError, "unrecognized kind");
+        return NULL;
+    }
+
+    if (!unlink) {
+        name_copy = PyMem_Malloc(strlen(name) + 1);
+        if (name_copy == NULL) {
+            return PyErr_NoMemory();
+        }
+        strcpy(name_copy, name);
+    }
+
+    SEM_CLEAR_ERROR();
+    handle = SEM_CREATE(name, value, maxvalue);
+    /* On Windows we should fail if GetLastError()==ERROR_ALREADY_EXISTS */
+    if (handle == SEM_FAILED || SEM_GET_LAST_ERROR() != 0)
+        goto failure;
+
+    if (unlink && SEM_UNLINK(name) < 0)
+        goto failure;
+
+    result = newsemlockobject(type, handle, kind, maxvalue, name_copy);
+    if (!result)
+        goto failure;
+
+    return result;
+
+  failure:
+    if (!PyErr_Occurred()) {
+        _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+    }
+    if (handle != SEM_FAILED)
+        SEM_CLOSE(handle);
+    PyMem_Free(name_copy);
+    return NULL;
+}
+
+/*[clinic input]
+@classmethod
+_multiprocessing.SemLock._rebuild
+
+    handle: SEM_HANDLE
+    kind: int
+    maxvalue: int
+    name: str(accept={str, NoneType})
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__rebuild_impl(PyTypeObject *type, SEM_HANDLE handle,
+                                       int kind, int maxvalue,
+                                       const char *name)
+/*[clinic end generated code: output=2aaee14f063f3bd9 input=f7040492ac6d9962]*/
+{
+    char *name_copy = NULL;
+
+    if (name != NULL) {
+        name_copy = PyMem_Malloc(strlen(name) + 1);
+        if (name_copy == NULL)
+            return PyErr_NoMemory();
+        strcpy(name_copy, name);
+    }
+
+#ifndef MS_WINDOWS
+    if (name != NULL) {
+        handle = sem_open(name, 0);
+        if (handle == SEM_FAILED) {
+            PyErr_SetFromErrno(PyExc_OSError);
+            PyMem_Free(name_copy);
+            return NULL;
+        }
+    }
+#endif
+
+    return newsemlockobject(type, handle, kind, maxvalue, name_copy);
+}
+
+static void
+semlock_dealloc(SemLockObject* self)
+{
+    PyTypeObject *tp = Py_TYPE(self);
+    PyObject_GC_UnTrack(self);
+    if (self->handle != SEM_FAILED)
+        SEM_CLOSE(self->handle);
+    PyMem_Free(self->name);
+    tp->tp_free(self);
+    Py_DECREF(tp);
+}
+
+/*[clinic input]
+_multiprocessing.SemLock._count
+
+Num of `acquire()`s minus num of `release()`s for this process.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__count_impl(SemLockObject *self)
+/*[clinic end generated code: output=5ba8213900e517bb input=36fc59b1cd1025ab]*/
+{
+    return PyLong_FromLong((long)self->count);
+}
+
+/*[clinic input]
+_multiprocessing.SemLock._is_mine
+
+Whether the lock is owned by this thread.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__is_mine_impl(SemLockObject *self)
+/*[clinic end generated code: output=92dc98863f4303be input=a96664cb2f0093ba]*/
+{
+    /* only makes sense for a lock */
+    return PyBool_FromLong(ISMINE(self));
+}
+
+/*[clinic input]
+_multiprocessing.SemLock._get_value
+
+Get the value of the semaphore.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__get_value_impl(SemLockObject *self)
+/*[clinic end generated code: output=64bc1b89bda05e36 input=cb10f9a769836203]*/
+{
+#ifdef HAVE_BROKEN_SEM_GETVALUE
+    PyErr_SetNone(PyExc_NotImplementedError);
+    return NULL;
+#else
+    int sval;
+    if (SEM_GETVALUE(self->handle, &sval) < 0)
+        return _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+    /* some posix implementations use negative numbers to indicate
+       the number of waiting threads */
+    if (sval < 0)
+        sval = 0;
+    return PyLong_FromLong((long)sval);
+#endif
+}
+
+/*[clinic input]
+_multiprocessing.SemLock._is_zero
+
+Return whether semaphore has value zero.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__is_zero_impl(SemLockObject *self)
+/*[clinic end generated code: output=815d4c878c806ed7 input=294a446418d31347]*/
+{
+#ifdef HAVE_BROKEN_SEM_GETVALUE
+    if (sem_trywait(self->handle) < 0) {
+        if (errno == EAGAIN)
+            Py_RETURN_TRUE;
+        return _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+    } else {
+        if (sem_post(self->handle) < 0)
+            return _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+        Py_RETURN_FALSE;
+    }
+#else
+    int sval;
+    if (SEM_GETVALUE(self->handle, &sval) < 0)
+        return _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+    return PyBool_FromLong((long)sval == 0);
+#endif
+}
+
+/*[clinic input]
+_multiprocessing.SemLock._after_fork
+
+Rezero the net acquisition count after fork().
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock__after_fork_impl(SemLockObject *self)
+/*[clinic end generated code: output=718bb27914c6a6c1 input=190991008a76621e]*/
+{
+    self->count = 0;
+    Py_RETURN_NONE;
+}
+
+/*[clinic input]
+_multiprocessing.SemLock.__enter__
+
+Enter the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock___enter___impl(SemLockObject *self)
+/*[clinic end generated code: output=beeb2f07c858511f input=c5e27d594284690b]*/
+{
+    return _multiprocessing_SemLock_acquire_impl(self, 1, Py_None);
+}
+
+/*[clinic input]
+_multiprocessing.SemLock.__exit__
+
+    exc_type: object = None
+    exc_value: object = None
+    exc_tb: object = None
+    /
+
+Exit the semaphore/lock.
+[clinic start generated code]*/
+
+static PyObject *
+_multiprocessing_SemLock___exit___impl(SemLockObject *self,
+                                       PyObject *exc_type,
+                                       PyObject *exc_value, PyObject *exc_tb)
+/*[clinic end generated code: output=3b37c1a9f8b91a03 input=7d644b64a89903f8]*/
+{
+    return _multiprocessing_SemLock_release_impl(self);
+}
+
+static int
+semlock_traverse(SemLockObject *s, visitproc visit, void *arg)
+{
+    Py_VISIT(Py_TYPE(s));
+    return 0;
+}
+
+/*
+ * Semaphore methods
+ */
+
+static PyMethodDef semlock_methods[] = {
+    _MULTIPROCESSING_SEMLOCK_ACQUIRE_METHODDEF
+    _MULTIPROCESSING_SEMLOCK_RELEASE_METHODDEF
+    _MULTIPROCESSING_SEMLOCK___ENTER___METHODDEF
+    _MULTIPROCESSING_SEMLOCK___EXIT___METHODDEF
+    _MULTIPROCESSING_SEMLOCK__COUNT_METHODDEF
+    _MULTIPROCESSING_SEMLOCK__IS_MINE_METHODDEF
+    _MULTIPROCESSING_SEMLOCK__GET_VALUE_METHODDEF
+    _MULTIPROCESSING_SEMLOCK__IS_ZERO_METHODDEF
+    _MULTIPROCESSING_SEMLOCK__REBUILD_METHODDEF
+    _MULTIPROCESSING_SEMLOCK__AFTER_FORK_METHODDEF
+    {NULL}
+};
+
+/*
+ * Member table
+ */
+
+static PyMemberDef semlock_members[] = {
+    {"handle", T_SEM_HANDLE, offsetof(SemLockObject, handle), READONLY,
+     ""},
+    {"kind", T_INT, offsetof(SemLockObject, kind), READONLY,
+     ""},
+    {"maxvalue", T_INT, offsetof(SemLockObject, maxvalue), READONLY,
+     ""},
+    {"name", T_STRING, offsetof(SemLockObject, name), READONLY,
+     ""},
+    {NULL}
+};
+
+/*
+ * Semaphore type
+ */
+
+static PyType_Slot _PyMp_SemLockType_slots[] = {
+    {Py_tp_dealloc, semlock_dealloc},
+    {Py_tp_getattro, PyObject_GenericGetAttr},
+    {Py_tp_setattro, PyObject_GenericSetAttr},
+    {Py_tp_methods, semlock_methods},
+    {Py_tp_members, semlock_members},
+    {Py_tp_alloc, PyType_GenericAlloc},
+    {Py_tp_new, _multiprocessing_SemLock},
+    {Py_tp_traverse, semlock_traverse},
+    {Py_tp_free, PyObject_GC_Del},
+    {Py_tp_doc, (void *)PyDoc_STR("Semaphore/Mutex type")},
+    {0, 0},
+};
+
+PyType_Spec _PyMp_SemLockType_spec = {
+    .name = "_multiprocessing.SemLock",
+    .basicsize = sizeof(SemLockObject),
+    .flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
+              Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_IMMUTABLETYPE),
+    .slots = _PyMp_SemLockType_slots,
+};
+
+/*
+ * Function to unlink semaphore names
+ */
+
+PyObject *
+_PyMp_sem_unlink(const char *name)
+{
+    if (SEM_UNLINK(name) < 0) {
+        _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
+#endif // HAVE_MP_SEMAPHORE