python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Modules/_multiprocessing/multiprocessing.c

@@ -0,0 +1,216 @@
+/*
+ * Extension module used by multiprocessing package
+ *
+ * multiprocessing.c
+ *
+ * Copyright (c) 2006-2008, R Oudkerk
+ * Licensed to PSF under a Contributor Agreement.
+ */
+
+#include "multiprocessing.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
+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, length;
+
+    if (!PyArg_ParseTuple(args, F_HANDLE "y*:send" , &handle, &buf))
+        return NULL;
+
+    length = (int)Py_MIN(buf.len, INT_MAX);
+
+    Py_BEGIN_ALLOW_THREADS
+    ret = send((SOCKET) handle, buf.buf, length, 0);
+    Py_END_ALLOW_THREADS
+
+    PyBuffer_Release(&buf);
+    if (ret < 0)
+        return PyErr_SetExcFromWindowsErr(PyExc_IOError, WSAGetLastError());
+    return PyLong_FromLong(ret);
+}
+
+#endif
+
+/*
+ * Function table
+ */
+
+static PyMethodDef module_methods[] = {
+#ifdef MS_WINDOWS
+    {"closesocket", multiprocessing_closesocket, METH_VARARGS, ""},
+    {"recv", multiprocessing_recv, METH_VARARGS, ""},
+    {"send", multiprocessing_send, METH_VARARGS, ""},
+#endif
+#if !defined(POSIX_SEMAPHORES_NOT_ENABLED) && !defined(__ANDROID__)
+    {"sem_unlink", _PyMp_sem_unlink, METH_VARARGS, ""},
+#endif
+    {NULL}
+};
+
+
+/*
+ * Initialize
+ */
+
+static struct PyModuleDef multiprocessing_module = {
+    PyModuleDef_HEAD_INIT,
+    "_multiprocessing",
+    NULL,
+    -1,
+    module_methods,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+
+PyMODINIT_FUNC
+PyInit__multiprocessing(void)
+{
+    PyObject *module, *temp, *value = NULL;
+
+    /* Initialize module */
+    module = PyModule_Create(&multiprocessing_module);
+    if (!module)
+        return NULL;
+
+#if defined(MS_WINDOWS) ||                                              \
+  (defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED))
+    /* Add _PyMp_SemLock type to module */
+    if (PyType_Ready(&_PyMp_SemLockType) < 0)
+        return NULL;
+    Py_INCREF(&_PyMp_SemLockType);
+    {
+        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). */
+        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 NULL;
+        PyDict_SetItemString(_PyMp_SemLockType.tp_dict, "SEM_VALUE_MAX",
+                             py_sem_value_max);
+    }
+    PyModule_AddObject(module, "SemLock", (PyObject*)&_PyMp_SemLockType);
+#endif
+
+    /* Add configuration macros */
+    temp = PyDict_New();
+    if (!temp)
+        return NULL;
+
+#define ADD_FLAG(name)                                            \
+    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(value)
+
+#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", temp) < 0)
+        return NULL;
+
+    return module;
+}

third_party/python/Modules/_multiprocessing/multiprocessing.h

@@ -0,0 +1,103 @@
+#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
+#  define WIN32_LEAN_AND_MEAN
+#  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
+#else
+#  include <fcntl.h>                 /* O_CREAT and O_EXCL */
+#  if defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED)
+#    include <semaphore.h>
+     typedef sem_t *SEM_HANDLE;
+#  endif
+#  define HANDLE int
+#  define SOCKET int
+#  define BOOL int
+#  define UINT32 uint32_t
+#  define INT32 int32_t
+#  define TRUE 1
+#  define FALSE 0
+#  define INVALID_HANDLE_VALUE (-1)
+#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
+#  define F_DWORD "k"
+#  define T_DWORD T_ULONG
+#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 PyTypeObject _PyMp_SemLockType;
+extern PyObject *_PyMp_sem_unlink(PyObject *ignore, PyObject *args);
+
+#endif /* MULTIPROCESSING_H */

third_party/python/Modules/_multiprocessing/semaphore.c

@@ -0,0 +1,679 @@
+/*
+ * A type which wraps a semaphore
+ *
+ * semaphore.c
+ *
+ * Copyright (c) 2006-2008, R Oudkerk
+ * Licensed to PSF under a Contributor Agreement.
+ */
+
+#include "multiprocessing.h"
+
+enum { RECURSIVE_MUTEX, SEMAPHORE };
+
+typedef struct {
+    PyObject_HEAD
+    SEM_HANDLE handle;
+    long last_tid;
+    int count;
+    int maxvalue;
+    int kind;
+    char *name;
+} SemLockObject;
+
+#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;
+    }
+}
+
+static PyObject *
+semlock_acquire(SemLockObject *self, PyObject *args, PyObject *kwds)
+{
+    int blocking = 1;
+    double timeout;
+    PyObject *timeout_obj = Py_None;
+    DWORD res, full_msecs, nhandles;
+    HANDLE handles[2], sigint_event;
+
+    static char *kwlist[] = {"block", "timeout", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|iO", kwlist,
+                                     &blocking, &timeout_obj))
+        return NULL;
+
+    /* 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_IOError);
+    case WAIT_FAILED:
+        return PyErr_SetFromWindowsErr(0);
+    default:
+        PyErr_Format(PyExc_RuntimeError, "WaitForSingleObject() or "
+                     "WaitForMultipleObjects() gave unrecognized "
+                     "value %d", res);
+        return NULL;
+    }
+}
+
+static PyObject *
+semlock_release(SemLockObject *self, PyObject *args)
+{
+    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 */
+
+static PyObject *
+semlock_acquire(SemLockObject *self, PyObject *args, PyObject *kwds)
+{
+    int blocking = 1, res, err = 0;
+    double timeout;
+    PyObject *timeout_obj = Py_None;
+    struct timespec deadline = {0};
+    struct timeval now;
+    long sec, nsec;
+
+    static char *kwlist[] = {"block", "timeout", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|iO", kwlist,
+                                     &blocking, &timeout_obj))
+        return NULL;
+
+    if (self->kind == RECURSIVE_MUTEX && ISMINE(self)) {
+        ++self->count;
+        Py_RETURN_TRUE;
+    }
+
+    if (timeout_obj != Py_None) {
+        timeout = PyFloat_AsDouble(timeout_obj);
+        if (PyErr_Occurred())
+            return NULL;
+        if (timeout < 0.0)
+            timeout = 0.0;
+
+        if (gettimeofday(&now, NULL) < 0) {
+            PyErr_SetFromErrno(PyExc_OSError);
+            return NULL;
+        }
+        sec = (long) timeout;
+        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;
+    }
+
+    do {
+        Py_BEGIN_ALLOW_THREADS
+        if (blocking && timeout_obj == Py_None)
+            res = sem_wait(self->handle);
+        else if (!blocking)
+            res = sem_trywait(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;
+}
+
+static PyObject *
+semlock_release(SemLockObject *self, PyObject *args)
+{
+    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;
+
+    self = PyObject_New(SemLockObject, type);
+    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;
+}
+
+static PyObject *
+semlock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+    SEM_HANDLE handle = SEM_FAILED;
+    int kind, maxvalue, value, unlink;
+    PyObject *result;
+    char *name, *name_copy = NULL;
+    static char *kwlist[] = {"kind", "value", "maxvalue", "name", "unlink",
+                             NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "iiisi", kwlist,
+                                     &kind, &value, &maxvalue, &name, &unlink))
+        return 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 (handle != SEM_FAILED)
+        SEM_CLOSE(handle);
+    PyMem_Free(name_copy);
+    if (!PyErr_Occurred()) {
+        _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+    }
+    return NULL;
+}
+
+static PyObject *
+semlock_rebuild(PyTypeObject *type, PyObject *args)
+{
+    SEM_HANDLE handle;
+    int kind, maxvalue;
+    char *name, *name_copy = NULL;
+
+    if (!PyArg_ParseTuple(args, F_SEM_HANDLE "iiz",
+                          &handle, &kind, &maxvalue, &name))
+        return 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) {
+            PyMem_Free(name_copy);
+            return PyErr_SetFromErrno(PyExc_OSError);
+        }
+    }
+#endif
+
+    return newsemlockobject(type, handle, kind, maxvalue, name_copy);
+}
+
+static void
+semlock_dealloc(SemLockObject* self)
+{
+    if (self->handle != SEM_FAILED)
+        SEM_CLOSE(self->handle);
+    PyMem_Free(self->name);
+    PyObject_Del(self);
+}
+
+static PyObject *
+semlock_count(SemLockObject *self)
+{
+    return PyLong_FromLong((long)self->count);
+}
+
+static PyObject *
+semlock_ismine(SemLockObject *self)
+{
+    /* only makes sense for a lock */
+    return PyBool_FromLong(ISMINE(self));
+}
+
+static PyObject *
+semlock_getvalue(SemLockObject *self)
+{
+#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
+}
+
+static PyObject *
+semlock_iszero(SemLockObject *self)
+{
+#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
+}
+
+static PyObject *
+semlock_afterfork(SemLockObject *self)
+{
+    self->count = 0;
+    Py_RETURN_NONE;
+}
+
+/*
+ * Semaphore methods
+ */
+
+static PyMethodDef semlock_methods[] = {
+    {"acquire", (PyCFunction)semlock_acquire, METH_VARARGS | METH_KEYWORDS,
+     "acquire the semaphore/lock"},
+    {"release", (PyCFunction)semlock_release, METH_NOARGS,
+     "release the semaphore/lock"},
+    {"__enter__", (PyCFunction)semlock_acquire, METH_VARARGS | METH_KEYWORDS,
+     "enter the semaphore/lock"},
+    {"__exit__", (PyCFunction)semlock_release, METH_VARARGS,
+     "exit the semaphore/lock"},
+    {"_count", (PyCFunction)semlock_count, METH_NOARGS,
+     "num of `acquire()`s minus num of `release()`s for this process"},
+    {"_is_mine", (PyCFunction)semlock_ismine, METH_NOARGS,
+     "whether the lock is owned by this thread"},
+    {"_get_value", (PyCFunction)semlock_getvalue, METH_NOARGS,
+     "get the value of the semaphore"},
+    {"_is_zero", (PyCFunction)semlock_iszero, METH_NOARGS,
+     "returns whether semaphore has value zero"},
+    {"_rebuild", (PyCFunction)semlock_rebuild, METH_VARARGS | METH_CLASS,
+     ""},
+    {"_after_fork", (PyCFunction)semlock_afterfork, METH_NOARGS,
+     "rezero the net acquisition count after fork()"},
+    {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
+ */
+
+PyTypeObject _PyMp_SemLockType = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    /* tp_name           */ "_multiprocessing.SemLock",
+    /* tp_basicsize      */ sizeof(SemLockObject),
+    /* tp_itemsize       */ 0,
+    /* tp_dealloc        */ (destructor)semlock_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 | Py_TPFLAGS_BASETYPE,
+    /* tp_doc            */ "Semaphore/Mutex type",
+    /* tp_traverse       */ 0,
+    /* tp_clear          */ 0,
+    /* tp_richcompare    */ 0,
+    /* tp_weaklistoffset */ 0,
+    /* tp_iter           */ 0,
+    /* tp_iternext       */ 0,
+    /* tp_methods        */ semlock_methods,
+    /* tp_members        */ semlock_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            */ semlock_new,
+};
+
+/*
+ * Function to unlink semaphore names
+ */
+
+PyObject *
+_PyMp_sem_unlink(PyObject *ignore, PyObject *args)
+{
+    char *name;
+
+    if (!PyArg_ParseTuple(args, "s", &name))
+        return NULL;
+
+    if (SEM_UNLINK(name) < 0) {
+        _PyMp_SetError(NULL, MP_STANDARD_ERROR);
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}