diff options
Diffstat (limited to 'Modules/_multiprocessing/multiprocessing.c')
| -rw-r--r-- | Modules/_multiprocessing/multiprocessing.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c new file mode 100644 index 0000000..89c5717 --- /dev/null +++ b/Modules/_multiprocessing/multiprocessing.c @@ -0,0 +1,322 @@ +/*
+ * Extension module used by mutliprocessing package
+ *
+ * multiprocessing.c
+ *
+ * Copyright (c) 2006-2008, R Oudkerk --- see COPYING.txt
+ */
+
+#include "multiprocessing.h"
+
+PyObject *create_win32_namespace(void);
+
+PyObject *pickle_dumps, *pickle_loads, *pickle_protocol;
+PyObject *ProcessError, *BufferTooShort;
+
+/*
+ * Function which raises exceptions based on error codes
+ */
+
+PyObject *
+mp_SetError(PyObject *Type, int num)
+{
+ switch (num) {
+#ifdef MS_WINDOWS
+ case MP_STANDARD_ERROR:
+ if (Type == NULL)
+ Type = PyExc_WindowsError;
+ PyErr_SetExcFromWindowsErr(Type, 0);
+ break;
+ case MP_SOCKET_ERROR:
+ if (Type == NULL)
+ Type = PyExc_WindowsError;
+ 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_END_OF_FILE:
+ PyErr_SetNone(PyExc_EOFError);
+ break;
+ case MP_EARLY_END_OF_FILE:
+ PyErr_SetString(PyExc_IOError,
+ "got end of file during message");
+ break;
+ case MP_BAD_MESSAGE_LENGTH:
+ PyErr_SetString(PyExc_IOError, "bad message length");
+ break;
+ case MP_EXCEPTION_HAS_BEEN_SET:
+ break;
+ default:
+ PyErr_Format(PyExc_RuntimeError,
+ "unkown error number %d", num);
+ }
+ return NULL;
+}
+
+
+/*
+ * Windows only
+ */
+
+#ifdef MS_WINDOWS
+
+/* On Windows we set an event to signal Ctrl-C; compare with timemodule.c */
+
+HANDLE sigint_event = NULL;
+
+static BOOL WINAPI
+ProcessingCtrlHandler(DWORD dwCtrlType)
+{
+ SetEvent(sigint_event);
+ return FALSE;
+}
+
+/*
+ * Unix only
+ */
+
+#else /* !MS_WINDOWS */
+
+#if HAVE_FD_TRANSFER
+
+/* Functions for transferring file descriptors between processes.
+ Reimplements some of the functionality of the fdcred
+ module at http://www.mca-ltd.com/resources/fdcred_1.tgz. */
+
+static PyObject *
+multiprocessing_sendfd(PyObject *self, PyObject *args)
+{
+ int conn, fd, res;
+ char dummy_char;
+ char buf[CMSG_SPACE(sizeof(int))];
+ struct msghdr msg = {0};
+ struct iovec dummy_iov;
+ struct cmsghdr *cmsg;
+
+ if (!PyArg_ParseTuple(args, "ii", &conn, &fd))
+ return NULL;
+
+ dummy_iov.iov_base = &dummy_char;
+ dummy_iov.iov_len = 1;
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ msg.msg_iov = &dummy_iov;
+ msg.msg_iovlen = 1;
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ msg.msg_controllen = cmsg->cmsg_len;
+ *(int*)CMSG_DATA(cmsg) = fd;
+
+ Py_BEGIN_ALLOW_THREADS
+ res = sendmsg(conn, &msg, 0);
+ Py_END_ALLOW_THREADS
+
+ if (res < 0)
+ return PyErr_SetFromErrno(PyExc_OSError);
+ Py_RETURN_NONE;
+}
+
+static PyObject *
+multiprocessing_recvfd(PyObject *self, PyObject *args)
+{
+ int conn, fd, res;
+ char dummy_char;
+ char buf[CMSG_SPACE(sizeof(int))];
+ struct msghdr msg = {0};
+ struct iovec dummy_iov;
+ struct cmsghdr *cmsg;
+
+ if (!PyArg_ParseTuple(args, "i", &conn))
+ return NULL;
+
+ dummy_iov.iov_base = &dummy_char;
+ dummy_iov.iov_len = 1;
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ msg.msg_iov = &dummy_iov;
+ msg.msg_iovlen = 1;
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ msg.msg_controllen = cmsg->cmsg_len;
+
+ Py_BEGIN_ALLOW_THREADS
+ res = recvmsg(conn, &msg, 0);
+ Py_END_ALLOW_THREADS
+
+ if (res < 0)
+ return PyErr_SetFromErrno(PyExc_OSError);
+
+ fd = *(int*)CMSG_DATA(cmsg);
+ return Py_BuildValue("i", fd);
+}
+
+#endif /* HAVE_FD_TRANSFER */
+
+#endif /* !MS_WINDOWS */
+
+
+/*
+ * All platforms
+ */
+
+static PyObject*
+multiprocessing_address_of_buffer(PyObject *self, PyObject *obj)
+{
+ void *buffer;
+ Py_ssize_t buffer_len;
+
+ if (PyObject_AsWriteBuffer(obj, &buffer, &buffer_len) < 0)
+ return NULL;
+
+ return Py_BuildValue("N" F_PY_SSIZE_T,
+ PyLong_FromVoidPtr(buffer), buffer_len);
+}
+
+
+/*
+ * Function table
+ */
+
+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"},
+#if HAVE_FD_TRANSFER
+ {"sendfd", multiprocessing_sendfd, METH_VARARGS,
+ "sendfd(sockfd, fd) -> None\n"
+ "Send file descriptor given by fd over the unix domain socket\n"
+ "whose file decriptor is sockfd"},
+ {"recvfd", multiprocessing_recvfd, METH_VARARGS,
+ "recvfd(sockfd) -> fd\n"
+ "Receive a file descriptor over a unix domain socket\n"
+ "whose file decriptor is sockfd"},
+#endif
+ {NULL}
+};
+
+
+/*
+ * Initialize
+ */
+
+static struct PyModuleDef multiprocessing_module = {
+ PyModuleDef_HEAD_INIT,
+ "_multiprocessing",
+ NULL,
+ -1,
+ module_methods,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
+
+PyObject*
+PyInit__multiprocessing(void)
+{
+ PyObject *module, *temp;
+
+ /* Initialize module */
+ module = PyModule_Create(&multiprocessing_module);
+ if (!module)
+ return NULL;
+
+ /* Get copy of objects from pickle */
+ temp = PyImport_ImportModule(PICKLE_MODULE);
+ if (!temp)
+ return NULL;
+ pickle_dumps = PyObject_GetAttrString(temp, "dumps");
+ pickle_loads = PyObject_GetAttrString(temp, "loads");
+ pickle_protocol = PyObject_GetAttrString(temp, "HIGHEST_PROTOCOL");
+ Py_XDECREF(temp);
+
+ /* Get copy of BufferTooShort */
+ temp = PyImport_ImportModule("multiprocessing");
+ if (!temp)
+ return NULL;
+ BufferTooShort = PyObject_GetAttrString(temp, "BufferTooShort");
+ Py_XDECREF(temp);
+
+ /* Add connection type to module */
+ if (PyType_Ready(&ConnectionType) < 0)
+ return NULL;
+ Py_INCREF(&ConnectionType);
+ PyModule_AddObject(module, "Connection", (PyObject*)&ConnectionType);
+
+#if defined(MS_WINDOWS) || HAVE_SEM_OPEN
+ /* Add SemLock type to module */
+ if (PyType_Ready(&SemLockType) < 0)
+ return NULL;
+ Py_INCREF(&SemLockType);
+ PyDict_SetItemString(SemLockType.tp_dict, "SEM_VALUE_MAX",
+ Py_BuildValue("i", SEM_VALUE_MAX));
+ PyModule_AddObject(module, "SemLock", (PyObject*)&SemLockType);
+#endif
+
+#ifdef MS_WINDOWS
+ /* Add PipeConnection to module */
+ if (PyType_Ready(&PipeConnectionType) < 0)
+ return NULL;
+ Py_INCREF(&PipeConnectionType);
+ PyModule_AddObject(module, "PipeConnection",
+ (PyObject*)&PipeConnectionType);
+
+ /* Initialize win32 class and add to multiprocessing */
+ temp = create_win32_namespace();
+ if (!temp)
+ return NULL;
+ PyModule_AddObject(module, "win32", temp);
+
+ /* Initialize the event handle used to signal Ctrl-C */
+ sigint_event = CreateEvent(NULL, TRUE, FALSE, NULL);
+ if (!sigint_event) {
+ PyErr_SetFromWindowsErr(0);
+ return NULL;
+ }
+ if (!SetConsoleCtrlHandler(ProcessingCtrlHandler, TRUE)) {
+ PyErr_SetFromWindowsErr(0);
+ return NULL;
+ }
+#endif
+
+ /* Add configuration macros */
+ temp = PyDict_New();
+ if (!temp)
+ return NULL;
+ if (PyModule_AddObject(module, "flags", temp) < 0)
+ return NULL;
+
+#define ADD_FLAG(name) \
+ if (PyDict_SetItemString(temp, #name, Py_BuildValue("i", name)) < 0) return NULL
+
+#ifdef HAVE_SEM_OPEN
+ ADD_FLAG(HAVE_SEM_OPEN);
+#endif
+#ifdef HAVE_SEM_TIMEDWAIT
+ ADD_FLAG(HAVE_SEM_TIMEDWAIT);
+#endif
+#ifdef HAVE_FD_TRANSFER
+ ADD_FLAG(HAVE_FD_TRANSFER);
+#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
+ return module;
+}
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