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