Issue #11750: The Windows API functions scattered in the _subprocess and

_multiprocessing.win32 modules now live in a single module "_winapi".
Patch by sbt.

2 files changed, 72 insertions, 834 deletions

diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c
index d370f9af2c4..6e39a239a69 100644
--- a/Modules/_multiprocessing/multiprocessing.c
+++ b/Modules/_multiprocessing/multiprocessing.c
@@ -9,8 +9,6 @@
 #include "multiprocessing.h"
 
 
-PyObject *create_win32_namespace(void);
-
 PyObject *ProcessError, *BufferTooShort;
 
 /*
@@ -66,6 +64,72 @@ multiprocessing_address_of_buffer(PyObject *self, PyObject *obj)
                          PyLong_FromVoidPtr(buffer), buffer_len);
 }
 
+#ifdef MS_WINDOWS
+static PyObject *
+multiprocessing_closesocket(PyObject *self, PyObject *args)
+{
+    HANDLE handle;
+    int ret;
+
+    if (!PyArg_ParseTuple(args, F_HANDLE ":closesocket" , &handle))
+        return NULL;
+
+    Py_BEGIN_ALLOW_THREADS
+    ret = closesocket((SOCKET) handle);
+    Py_END_ALLOW_THREADS
+
+    if (ret)
+        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
+    Py_RETURN_NONE;
+}
+
+static PyObject *
+multiprocessing_recv(PyObject *self, PyObject *args)
+{
+    HANDLE handle;
+    int size, nread;
+    PyObject *buf;
+
+    if (!PyArg_ParseTuple(args, F_HANDLE "i:recv" , &handle, &size))
+        return NULL;
+
+    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_IOError, WSAGetLastError());
+    }
+    _PyBytes_Resize(&buf, nread);
+    return buf;
+}
+
+static PyObject *
+multiprocessing_send(PyObject *self, PyObject *args)
+{
+    HANDLE handle;
+    Py_buffer buf;
+    int ret;
+
+    if (!PyArg_ParseTuple(args, F_HANDLE "y*:send" , &handle, &buf))
+        return NULL;
+
+    Py_BEGIN_ALLOW_THREADS
+    ret = send((SOCKET) handle, buf.buf, buf.len, 0);
+    Py_END_ALLOW_THREADS
+
+    PyBuffer_Release(&buf);
+    if (ret < 0)
+        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
+    return PyLong_FromLong(ret);
+}
+
+#endif
 
 /*
  * Function table
@@ -75,6 +139,11 @@ static PyMethodDef module_methods[] = {
     {"address_of_buffer", multiprocessing_address_of_buffer, METH_O,
      "address_of_buffer(obj) -> int\n"
      "Return address of obj assuming obj supports buffer inteface"},
+#ifdef MS_WINDOWS
+    {"closesocket", multiprocessing_closesocket, METH_VARARGS, ""},
+    {"recv", multiprocessing_recv, METH_VARARGS, ""},
+    {"send", multiprocessing_send, METH_VARARGS, ""},
+#endif
     {NULL}
 };
 
@@ -135,14 +204,6 @@ PyInit__multiprocessing(void)
     PyModule_AddObject(module, "SemLock", (PyObject*)&SemLockType);
 #endif
 
-#ifdef MS_WINDOWS
-    /* Initialize win32 class and add to multiprocessing */
-    temp = create_win32_namespace();
-    if (!temp)
-        return NULL;
-    PyModule_AddObject(module, "win32", temp);
-#endif
-
     /* Add configuration macros */
     temp = PyDict_New();
     if (!temp)
@@ -152,7 +213,7 @@ PyInit__multiprocessing(void)
     value = Py_BuildValue("i", name);                             \
     if (value == NULL) { Py_DECREF(temp); return NULL; }          \
     if (PyDict_SetItemString(temp, #name, value) < 0) {           \
-        Py_DECREF(temp); Py_DECREF(value); return NULL; }                 \
+        Py_DECREF(temp); Py_DECREF(value); return NULL; }         \
     Py_DECREF(value)
 
 #if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
diff --git a/Modules/_multiprocessing/win32_functions.c b/Modules/_multiprocessing/win32_functions.c
deleted file mode 100644
index 93c8fc9cde5..00000000000
--- a/Modules/_multiprocessing/win32_functions.c
+++ /dev/null
@@ -1,823 +0,0 @@
-/*
- * Win32 functions used by multiprocessing package
- *
- * win32_functions.c
- *
- * Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
- */
-
-#include "multiprocessing.h"
-
-
-#define WIN32_FUNCTION(func) \
-    {#func, (PyCFunction)win32_ ## func, METH_VARARGS | METH_STATIC, ""}
-
-#define WIN32_KWARGS_FUNCTION(func) \
-    {#func, (PyCFunction)win32_ ## func, METH_VARARGS | METH_KEYWORDS | METH_STATIC, ""}
-
-#define WIN32_CONSTANT(fmt, con) \
-    PyDict_SetItemString(Win32Type.tp_dict, #con, Py_BuildValue(fmt, con))
-
-
-/* Grab CancelIoEx dynamically from kernel32 */
-static int has_CancelIoEx = -1;
-static BOOL (CALLBACK *Py_CancelIoEx)(HANDLE, LPOVERLAPPED);
-
-static int
-check_CancelIoEx()
-{
-    if (has_CancelIoEx == -1)
-    {
-        HINSTANCE hKernel32 = GetModuleHandle("KERNEL32");
-        * (FARPROC *) &Py_CancelIoEx = GetProcAddress(hKernel32,
-                                                      "CancelIoEx");
-        has_CancelIoEx = (Py_CancelIoEx != NULL);
-    }
-    return has_CancelIoEx;
-}
-
-
-/*
- * A Python object wrapping an OVERLAPPED structure and other useful data
- * for overlapped I/O
- */
-
-typedef struct {
-    PyObject_HEAD
-    OVERLAPPED overlapped;
-    /* For convenience, we store the file handle too */
-    HANDLE handle;
-    /* Whether there's I/O in flight */
-    int pending;
-    /* Whether I/O completed successfully */
-    int completed;
-    /* Buffer used for reading (optional) */
-    PyObject *read_buffer;
-    /* Buffer used for writing (optional) */
-    Py_buffer write_buffer;
-} OverlappedObject;
-
-static void
-overlapped_dealloc(OverlappedObject *self)
-{
-    DWORD bytes;
-    int err = GetLastError();
-    if (self->pending) {
-        /* make it a programming error to deallocate while operation
-           is pending, even if we can safely cancel it */
-        if (check_CancelIoEx() &&
-                Py_CancelIoEx(self->handle, &self->overlapped))
-            GetOverlappedResult(self->handle, &self->overlapped, &bytes, TRUE);
-        PyErr_SetString(PyExc_RuntimeError,
-                        "I/O operations still in flight while destroying "
-                        "Overlapped object, the process may crash");
-        PyErr_WriteUnraisable(NULL);
-    }
-    CloseHandle(self->overlapped.hEvent);
-    SetLastError(err);
-    if (self->write_buffer.obj)
-        PyBuffer_Release(&self->write_buffer);
-    Py_CLEAR(self->read_buffer);
-    PyObject_Del(self);
-}
-
-static PyObject *
-overlapped_GetOverlappedResult(OverlappedObject *self, PyObject *waitobj)
-{
-    int wait;
-    BOOL res;
-    DWORD transferred = 0;
-    DWORD err;
-
-    wait = PyObject_IsTrue(waitobj);
-    if (wait < 0)
-        return NULL;
-    Py_BEGIN_ALLOW_THREADS
-    res = GetOverlappedResult(self->handle, &self->overlapped, &transferred,
-                              wait != 0);
-    Py_END_ALLOW_THREADS
-
-    err = res ? ERROR_SUCCESS : GetLastError();
-    switch (err) {
-        case ERROR_SUCCESS:
-        case ERROR_MORE_DATA:
-        case ERROR_OPERATION_ABORTED:
-            self->completed = 1;
-            self->pending = 0;
-            break;
-        case ERROR_IO_INCOMPLETE:
-            break;
-        default:
-            self->pending = 0;
-            return PyErr_SetExcFromWindowsErr(PyExc_IOError, err);
-    }
-    if (self->completed && self->read_buffer != NULL) {
-        assert(PyBytes_CheckExact(self->read_buffer));
-        if (transferred != PyBytes_GET_SIZE(self->read_buffer) &&
-            _PyBytes_Resize(&self->read_buffer, transferred))
-            return NULL;
-    }
-    return Py_BuildValue("II", (unsigned) transferred, (unsigned) err);
-}
-
-static PyObject *
-overlapped_getbuffer(OverlappedObject *self)
-{
-    PyObject *res;
-    if (!self->completed) {
-        PyErr_SetString(PyExc_ValueError,
-                        "can't get read buffer before GetOverlappedResult() "
-                        "signals the operation completed");
-        return NULL;
-    }
-    res = self->read_buffer ? self->read_buffer : Py_None;
-    Py_INCREF(res);
-    return res;
-}
-
-static PyObject *
-overlapped_cancel(OverlappedObject *self)
-{
-    BOOL res = TRUE;
-
-    if (self->pending) {
-        Py_BEGIN_ALLOW_THREADS
-        if (check_CancelIoEx())
-            res = Py_CancelIoEx(self->handle, &self->overlapped);
-        else
-            res = CancelIo(self->handle);
-        Py_END_ALLOW_THREADS
-    }
-
-    /* CancelIoEx returns ERROR_NOT_FOUND if the I/O completed in-between */
-    if (!res && GetLastError() != ERROR_NOT_FOUND)
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-    self->pending = 0;
-    Py_RETURN_NONE;
-}
-
-static PyMethodDef overlapped_methods[] = {
-    {"GetOverlappedResult", (PyCFunction) overlapped_GetOverlappedResult,
-                            METH_O, NULL},
-    {"getbuffer", (PyCFunction) overlapped_getbuffer, METH_NOARGS, NULL},
-    {"cancel", (PyCFunction) overlapped_cancel, METH_NOARGS, NULL},
-    {NULL}
-};
-
-static PyMemberDef overlapped_members[] = {
-    {"event", T_HANDLE,
-     offsetof(OverlappedObject, overlapped) + offsetof(OVERLAPPED, hEvent),
-     READONLY, "overlapped event handle"},
-    {NULL}
-};
-
-PyTypeObject OverlappedType = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-    /* tp_name           */ "_multiprocessing.win32.Overlapped",
-    /* tp_basicsize      */ sizeof(OverlappedObject),
-    /* tp_itemsize       */ 0,
-    /* tp_dealloc        */ (destructor) overlapped_dealloc,
-    /* tp_print          */ 0,
-    /* tp_getattr        */ 0,
-    /* tp_setattr        */ 0,
-    /* tp_reserved       */ 0,
-    /* tp_repr           */ 0,
-    /* tp_as_number      */ 0,
-    /* tp_as_sequence    */ 0,
-    /* tp_as_mapping     */ 0,
-    /* tp_hash           */ 0,
-    /* tp_call           */ 0,
-    /* tp_str            */ 0,
-    /* tp_getattro       */ 0,
-    /* tp_setattro       */ 0,
-    /* tp_as_buffer      */ 0,
-    /* tp_flags          */ Py_TPFLAGS_DEFAULT,
-    /* tp_doc            */ "OVERLAPPED structure wrapper",
-    /* tp_traverse       */ 0,
-    /* tp_clear          */ 0,
-    /* tp_richcompare    */ 0,
-    /* tp_weaklistoffset */ 0,
-    /* tp_iter           */ 0,
-    /* tp_iternext       */ 0,
-    /* tp_methods        */ overlapped_methods,
-    /* tp_members        */ overlapped_members,
-    /* tp_getset         */ 0,
-    /* tp_base           */ 0,
-    /* tp_dict           */ 0,
-    /* tp_descr_get      */ 0,
-    /* tp_descr_set      */ 0,
-    /* tp_dictoffset     */ 0,
-    /* tp_init           */ 0,
-    /* tp_alloc          */ 0,
-    /* tp_new            */ 0,
-};
-
-static OverlappedObject *
-new_overlapped(HANDLE handle)
-{
-    OverlappedObject *self;
-
-    self = PyObject_New(OverlappedObject, &OverlappedType);
-    if (!self)
-        return NULL;
-    self->handle = handle;
-    self->read_buffer = NULL;
-    self->pending = 0;
-    self->completed = 0;
-    memset(&self->overlapped, 0, sizeof(OVERLAPPED));
-    memset(&self->write_buffer, 0, sizeof(Py_buffer));
-    /* Manual reset, initially non-signalled */
-    self->overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
-    return self;
-}
-
-
-/*
- * Module functions
- */
-
-static PyObject *
-win32_CloseHandle(PyObject *self, PyObject *args)
-{
-    HANDLE hObject;
-    BOOL success;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE, &hObject))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    success = CloseHandle(hObject);
-    Py_END_ALLOW_THREADS
-
-    if (!success)
-        return PyErr_SetFromWindowsErr(0);
-
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-win32_ConnectNamedPipe(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    HANDLE hNamedPipe;
-    int use_overlapped = 0;
-    BOOL success;
-    OverlappedObject *overlapped = NULL;
-    static char *kwlist[] = {"handle", "overlapped", NULL};
-
-    if (!PyArg_ParseTupleAndKeywords(args, kwds,
-                                     F_HANDLE "|i", kwlist,
-                                     &hNamedPipe, &use_overlapped))
-        return NULL;
-
-    if (use_overlapped) {
-        overlapped = new_overlapped(hNamedPipe);
-        if (!overlapped)
-            return NULL;
-    }
-
-    Py_BEGIN_ALLOW_THREADS
-    success = ConnectNamedPipe(hNamedPipe,
-                               overlapped ? &overlapped->overlapped : NULL);
-    Py_END_ALLOW_THREADS
-
-    if (overlapped) {
-        int err = GetLastError();
-        /* Overlapped ConnectNamedPipe never returns a success code */
-        assert(success == 0);
-        if (err == ERROR_IO_PENDING)
-            overlapped->pending = 1;
-        else if (err == ERROR_PIPE_CONNECTED)
-            SetEvent(overlapped->overlapped.hEvent);
-        else {
-            Py_DECREF(overlapped);
-            return PyErr_SetFromWindowsErr(err);
-        }
-        return (PyObject *) overlapped;
-    }
-    if (!success)
-        return PyErr_SetFromWindowsErr(0);
-
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-win32_CreateFile(PyObject *self, PyObject *args)
-{
-    LPCTSTR lpFileName;
-    DWORD dwDesiredAccess;
-    DWORD dwShareMode;
-    LPSECURITY_ATTRIBUTES lpSecurityAttributes;
-    DWORD dwCreationDisposition;
-    DWORD dwFlagsAndAttributes;
-    HANDLE hTemplateFile;
-    HANDLE handle;
-
-    if (!PyArg_ParseTuple(args, "s" F_DWORD F_DWORD F_POINTER
-                          F_DWORD F_DWORD F_HANDLE,
-                          &lpFileName, &dwDesiredAccess, &dwShareMode,
-                          &lpSecurityAttributes, &dwCreationDisposition,
-                          &dwFlagsAndAttributes, &hTemplateFile))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    handle = CreateFile(lpFileName, dwDesiredAccess,
-                        dwShareMode, lpSecurityAttributes,
-                        dwCreationDisposition,
-                        dwFlagsAndAttributes, hTemplateFile);
-    Py_END_ALLOW_THREADS
-
-    if (handle == INVALID_HANDLE_VALUE)
-        return PyErr_SetFromWindowsErr(0);
-
-    return Py_BuildValue(F_HANDLE, handle);
-}
-
-static PyObject *
-win32_CreateNamedPipe(PyObject *self, PyObject *args)
-{
-    LPCTSTR lpName;
-    DWORD dwOpenMode;
-    DWORD dwPipeMode;
-    DWORD nMaxInstances;
-    DWORD nOutBufferSize;
-    DWORD nInBufferSize;
-    DWORD nDefaultTimeOut;
-    LPSECURITY_ATTRIBUTES lpSecurityAttributes;
-    HANDLE handle;
-
-    if (!PyArg_ParseTuple(args, "s" F_DWORD F_DWORD F_DWORD
-                          F_DWORD F_DWORD F_DWORD F_POINTER,
-                          &lpName, &dwOpenMode, &dwPipeMode,
-                          &nMaxInstances, &nOutBufferSize,
-                          &nInBufferSize, &nDefaultTimeOut,
-                          &lpSecurityAttributes))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    handle = CreateNamedPipe(lpName, dwOpenMode, dwPipeMode,
-                             nMaxInstances, nOutBufferSize,
-                             nInBufferSize, nDefaultTimeOut,
-                             lpSecurityAttributes);
-    Py_END_ALLOW_THREADS
-
-    if (handle == INVALID_HANDLE_VALUE)
-        return PyErr_SetFromWindowsErr(0);
-
-    return Py_BuildValue(F_HANDLE, handle);
-}
-
-static PyObject *
-win32_ExitProcess(PyObject *self, PyObject *args)
-{
-    UINT uExitCode;
-
-    if (!PyArg_ParseTuple(args, "I", &uExitCode))
-        return NULL;
-
-    #if defined(Py_DEBUG)
-        SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOALIGNMENTFAULTEXCEPT|SEM_NOGPFAULTERRORBOX|SEM_NOOPENFILEERRORBOX);
-        _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
-    #endif
-
-
-    ExitProcess(uExitCode);
-
-    return NULL;
-}
-
-static PyObject *
-win32_GetLastError(PyObject *self, PyObject *args)
-{
-    return Py_BuildValue(F_DWORD, GetLastError());
-}
-
-static PyObject *
-win32_OpenProcess(PyObject *self, PyObject *args)
-{
-    DWORD dwDesiredAccess;
-    BOOL bInheritHandle;
-    DWORD dwProcessId;
-    HANDLE handle;
-
-    if (!PyArg_ParseTuple(args, F_DWORD "i" F_DWORD,
-                          &dwDesiredAccess, &bInheritHandle, &dwProcessId))
-        return NULL;
-
-    handle = OpenProcess(dwDesiredAccess, bInheritHandle, dwProcessId);
-    if (handle == NULL)
-        return PyErr_SetFromWindowsErr(0);
-
-    return Py_BuildValue(F_HANDLE, handle);
-}
-
-static PyObject *
-win32_SetNamedPipeHandleState(PyObject *self, PyObject *args)
-{
-    HANDLE hNamedPipe;
-    PyObject *oArgs[3];
-    DWORD dwArgs[3], *pArgs[3] = {NULL, NULL, NULL};
-    int i;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE "OOO",
-                          &hNamedPipe, &oArgs[0], &oArgs[1], &oArgs[2]))
-        return NULL;
-
-    PyErr_Clear();
-
-    for (i = 0 ; i < 3 ; i++) {
-        if (oArgs[i] != Py_None) {
-            dwArgs[i] = PyLong_AsUnsignedLongMask(oArgs[i]);
-            if (PyErr_Occurred())
-                return NULL;
-            pArgs[i] = &dwArgs[i];
-        }
-    }
-
-    if (!SetNamedPipeHandleState(hNamedPipe, pArgs[0], pArgs[1], pArgs[2]))
-        return PyErr_SetFromWindowsErr(0);
-
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-win32_WaitNamedPipe(PyObject *self, PyObject *args)
-{
-    LPCTSTR lpNamedPipeName;
-    DWORD nTimeOut;
-    BOOL success;
-
-    if (!PyArg_ParseTuple(args, "s" F_DWORD, &lpNamedPipeName, &nTimeOut))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    success = WaitNamedPipe(lpNamedPipeName, nTimeOut);
-    Py_END_ALLOW_THREADS
-
-    if (!success)
-        return PyErr_SetFromWindowsErr(0);
-
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-win32_closesocket(PyObject *self, PyObject *args)
-{
-    HANDLE handle;
-    int ret;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE ":closesocket" , &handle))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    ret = closesocket((SOCKET) handle);
-    Py_END_ALLOW_THREADS
-
-    if (ret)
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
-    Py_RETURN_NONE;
-}
-
-static PyObject *
-win32_recv(PyObject *self, PyObject *args)
-{
-    HANDLE handle;
-    int size, nread;
-    PyObject *buf;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE "i:recv" , &handle, &size))
-        return NULL;
-
-    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_IOError, WSAGetLastError());
-    }
-    _PyBytes_Resize(&buf, nread);
-    return buf;
-}
-
-static PyObject *
-win32_send(PyObject *self, PyObject *args)
-{
-    HANDLE handle;
-    Py_buffer buf;
-    int ret;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE "y*:send" , &handle, &buf))
-        return NULL;
-
-    Py_BEGIN_ALLOW_THREADS
-    ret = send((SOCKET) handle, buf.buf, buf.len, 0);
-    Py_END_ALLOW_THREADS
-
-    PyBuffer_Release(&buf);
-    if (ret < 0)
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
-    return PyLong_FromLong(ret);
-}
-
-static PyObject *
-win32_WriteFile(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    HANDLE handle;
-    Py_buffer _buf, *buf;
-    PyObject *bufobj;
-    DWORD written;
-    BOOL ret;
-    int use_overlapped = 0;
-    DWORD err;
-    OverlappedObject *overlapped = NULL;
-    static char *kwlist[] = {"handle", "buffer", "overlapped", NULL};
-
-    /* First get handle and use_overlapped to know which Py_buffer to use */
-    if (!PyArg_ParseTupleAndKeywords(args, kwds,
-                                     F_HANDLE "O|i:WriteFile", kwlist,
-                                     &handle, &bufobj, &use_overlapped))
-        return NULL;
-
-    if (use_overlapped) {
-        overlapped = new_overlapped(handle);
-        if (!overlapped)
-            return NULL;
-        buf = &overlapped->write_buffer;
-    }
-    else
-        buf = &_buf;
-
-    if (!PyArg_Parse(bufobj, "y*", buf)) {
-        Py_XDECREF(overlapped);
-        return NULL;
-    }
-
-    Py_BEGIN_ALLOW_THREADS
-    ret = WriteFile(handle, buf->buf, buf->len, &written,
-                    overlapped ? &overlapped->overlapped : NULL);
-    Py_END_ALLOW_THREADS
-
-    err = ret ? 0 : GetLastError();
-
-    if (overlapped) {
-        if (!ret) {
-            if (err == ERROR_IO_PENDING)
-                overlapped->pending = 1;
-            else {
-                Py_DECREF(overlapped);
-                return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-            }
-        }
-        return Py_BuildValue("NI", (PyObject *) overlapped, err);
-    }
-
-    PyBuffer_Release(buf);
-    if (!ret)
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-    return Py_BuildValue("II", written, err);
-}
-
-static PyObject *
-win32_ReadFile(PyObject *self, PyObject *args, PyObject *kwds)
-{
-    HANDLE handle;
-    int size;
-    DWORD nread;
-    PyObject *buf;
-    BOOL ret;
-    int use_overlapped = 0;
-    DWORD err;
-    OverlappedObject *overlapped = NULL;
-    static char *kwlist[] = {"handle", "size", "overlapped", NULL};
-
-    if (!PyArg_ParseTupleAndKeywords(args, kwds,
-                                     F_HANDLE "i|i:ReadFile", kwlist,
-                                     &handle, &size, &use_overlapped))
-        return NULL;
-
-    buf = PyBytes_FromStringAndSize(NULL, size);
-    if (!buf)
-        return NULL;
-    if (use_overlapped) {
-        overlapped = new_overlapped(handle);
-        if (!overlapped) {
-            Py_DECREF(buf);
-            return NULL;
-        }
-        /* Steals reference to buf */
-        overlapped->read_buffer = buf;
-    }
-
-    Py_BEGIN_ALLOW_THREADS
-    ret = ReadFile(handle, PyBytes_AS_STRING(buf), size, &nread,
-                   overlapped ? &overlapped->overlapped : NULL);
-    Py_END_ALLOW_THREADS
-
-    err = ret ? 0 : GetLastError();
-
-    if (overlapped) {
-        if (!ret) {
-            if (err == ERROR_IO_PENDING)
-                overlapped->pending = 1;
-            else if (err != ERROR_MORE_DATA) {
-                Py_DECREF(overlapped);
-                return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-            }
-        }
-        return Py_BuildValue("NI", (PyObject *) overlapped, err);
-    }
-
-    if (!ret && err != ERROR_MORE_DATA) {
-        Py_DECREF(buf);
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-    }
-    if (_PyBytes_Resize(&buf, nread))
-        return NULL;
-    return Py_BuildValue("NI", buf, err);
-}
-
-static PyObject *
-win32_PeekNamedPipe(PyObject *self, PyObject *args)
-{
-    HANDLE handle;
-    int size = 0;
-    PyObject *buf = NULL;
-    DWORD nread, navail, nleft;
-    BOOL ret;
-
-    if (!PyArg_ParseTuple(args, F_HANDLE "|i:PeekNamedPipe" , &handle, &size))
-        return NULL;
-
-    if (size < 0) {
-        PyErr_SetString(PyExc_ValueError, "negative size");
-        return NULL;
-    }
-
-    if (size) {
-        buf = PyBytes_FromStringAndSize(NULL, size);
-        if (!buf)
-            return NULL;
-        Py_BEGIN_ALLOW_THREADS
-        ret = PeekNamedPipe(handle, PyBytes_AS_STRING(buf), size, &nread,
-                            &navail, &nleft);
-        Py_END_ALLOW_THREADS
-        if (!ret) {
-            Py_DECREF(buf);
-            return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-        }
-        if (_PyBytes_Resize(&buf, nread))
-            return NULL;
-        return Py_BuildValue("Nii", buf, navail, nleft);
-    }
-    else {
-        Py_BEGIN_ALLOW_THREADS
-        ret = PeekNamedPipe(handle, NULL, 0, NULL, &navail, &nleft);
-        Py_END_ALLOW_THREADS
-        if (!ret) {
-            return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-        }
-        return Py_BuildValue("ii", navail, nleft);
-    }
-}
-
-static PyObject *
-win32_WaitForMultipleObjects(PyObject* self, PyObject* args)
-{
-    DWORD result;
-    PyObject *handle_seq;
-    HANDLE handles[MAXIMUM_WAIT_OBJECTS];
-    HANDLE sigint_event = NULL;
-    Py_ssize_t nhandles, i;
-    int wait_flag;
-    int milliseconds = INFINITE;
-
-    if (!PyArg_ParseTuple(args, "Oi|i:WaitForMultipleObjects",
-                                &handle_seq, &wait_flag, &milliseconds))
-        return NULL;
-
-    if (!PySequence_Check(handle_seq)) {
-        PyErr_Format(PyExc_TypeError,
-                     "sequence type expected, got '%s'",
-                     Py_TYPE(handle_seq)->tp_doc);
-        return NULL;
-    }
-    nhandles = PySequence_Length(handle_seq);
-    if (nhandles == -1)
-        return NULL;
-    if (nhandles < 0 || nhandles >= MAXIMUM_WAIT_OBJECTS - 1) {
-        PyErr_Format(PyExc_ValueError,
-                     "need at most %zd handles, got a sequence of length %zd",
-                     MAXIMUM_WAIT_OBJECTS - 1, nhandles);
-        return NULL;
-    }
-    for (i = 0; i < nhandles; i++) {
-        HANDLE h;
-        PyObject *v = PySequence_GetItem(handle_seq, i);
-        if (v == NULL)
-            return NULL;
-        if (!PyArg_Parse(v, F_HANDLE, &h)) {
-            Py_DECREF(v);
-            return NULL;
-        }
-        handles[i] = h;
-        Py_DECREF(v);
-    }
-    /* If this is the main thread then make the wait interruptible
-       by Ctrl-C unless we are waiting for *all* handles */
-    if (!wait_flag && _PyOS_IsMainThread()) {
-        sigint_event = _PyOS_SigintEvent();
-        assert(sigint_event != NULL);
-        handles[nhandles++] = sigint_event;
-    }
-
-    Py_BEGIN_ALLOW_THREADS
-    if (sigint_event != NULL)
-        ResetEvent(sigint_event);
-    result = WaitForMultipleObjects((DWORD) nhandles, handles,
-                                    (BOOL) wait_flag, (DWORD) milliseconds);
-    Py_END_ALLOW_THREADS
-
-    if (result == WAIT_FAILED)
-        return PyErr_SetExcFromWindowsErr(PyExc_IOError, 0);
-    else if (sigint_event != NULL && result == WAIT_OBJECT_0 + nhandles - 1) {
-        errno = EINTR;
-        return PyErr_SetFromErrno(PyExc_IOError);
-    }
-
-    return PyLong_FromLong((int) result);
-}
-
-
-static PyMethodDef win32_methods[] = {
-    WIN32_FUNCTION(CloseHandle),
-    WIN32_FUNCTION(GetLastError),
-    WIN32_FUNCTION(OpenProcess),
-    WIN32_FUNCTION(ExitProcess),
-    WIN32_KWARGS_FUNCTION(ConnectNamedPipe),
-    WIN32_FUNCTION(CreateFile),
-    WIN32_FUNCTION(CreateNamedPipe),
-    WIN32_KWARGS_FUNCTION(ReadFile),
-    WIN32_FUNCTION(PeekNamedPipe),
-    WIN32_FUNCTION(SetNamedPipeHandleState),
-    WIN32_FUNCTION(WaitForMultipleObjects),
-    WIN32_FUNCTION(WaitNamedPipe),
-    WIN32_KWARGS_FUNCTION(WriteFile),
-    WIN32_FUNCTION(closesocket),
-    WIN32_FUNCTION(recv),
-    WIN32_FUNCTION(send),
-    {NULL}
-};
-
-
-PyTypeObject Win32Type = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-};
-
-
-PyObject *
-create_win32_namespace(void)
-{
-    Win32Type.tp_name = "_multiprocessing.win32";
-    Win32Type.tp_methods = win32_methods;
-    if (PyType_Ready(&Win32Type) < 0)
-        return NULL;
-    Py_INCREF(&Win32Type);
-
-    if (PyType_Ready(&OverlappedType) < 0)
-        return NULL;
-    PyDict_SetItemString(Win32Type.tp_dict, "Overlapped",
-                         (PyObject *) &OverlappedType);
-
-    WIN32_CONSTANT(F_DWORD, ERROR_ALREADY_EXISTS);
-    WIN32_CONSTANT(F_DWORD, ERROR_BROKEN_PIPE);
-    WIN32_CONSTANT(F_DWORD, ERROR_IO_PENDING);
-    WIN32_CONSTANT(F_DWORD, ERROR_MORE_DATA);
-    WIN32_CONSTANT(F_DWORD, ERROR_NETNAME_DELETED);
-    WIN32_CONSTANT(F_DWORD, ERROR_NO_SYSTEM_RESOURCES);
-    WIN32_CONSTANT(F_DWORD, ERROR_OPERATION_ABORTED);
-    WIN32_CONSTANT(F_DWORD, ERROR_PIPE_BUSY);
-    WIN32_CONSTANT(F_DWORD, ERROR_PIPE_CONNECTED);
-    WIN32_CONSTANT(F_DWORD, ERROR_SEM_TIMEOUT);
-    WIN32_CONSTANT(F_DWORD, FILE_FLAG_FIRST_PIPE_INSTANCE);
-    WIN32_CONSTANT(F_DWORD, FILE_FLAG_OVERLAPPED);
-    WIN32_CONSTANT(F_DWORD, GENERIC_READ);
-    WIN32_CONSTANT(F_DWORD, GENERIC_WRITE);
-    WIN32_CONSTANT(F_DWORD, INFINITE);
-    WIN32_CONSTANT(F_DWORD, NMPWAIT_WAIT_FOREVER);
-    WIN32_CONSTANT(F_DWORD, OPEN_EXISTING);
-    WIN32_CONSTANT(F_DWORD, PIPE_ACCESS_DUPLEX);
-    WIN32_CONSTANT(F_DWORD, PIPE_ACCESS_INBOUND);
-    WIN32_CONSTANT(F_DWORD, PIPE_READMODE_MESSAGE);
-    WIN32_CONSTANT(F_DWORD, PIPE_TYPE_MESSAGE);
-    WIN32_CONSTANT(F_DWORD, PIPE_UNLIMITED_INSTANCES);
-    WIN32_CONSTANT(F_DWORD, PIPE_WAIT);
-    WIN32_CONSTANT(F_DWORD, PROCESS_ALL_ACCESS);
-
-    WIN32_CONSTANT("i", NULL);
-
-    return (PyObject*)&Win32Type;
-}