Modules/_multiprocessing/multiprocessing.c - platform/external/python/cpython2 - Gitiles

 /*
  * Extension module used by multiprocessing 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
  */

 PyMODINIT_FUNC
 init_multiprocessing(void)
 {
 	PyObject *module, *temp, *value;

 	/* Initialize module */
 	module = Py_InitModule("_multiprocessing", module_methods);
 	if (!module)
 		return;

 	/* Get copy of objects from pickle */
 	temp = PyImport_ImportModule(PICKLE_MODULE);
 	if (!temp)
 		return;
 	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;
 	BufferTooShort = PyObject_GetAttrString(temp, "BufferTooShort");
 	Py_XDECREF(temp);

 	/* Add connection type to module */
 	if (PyType_Ready(&ConnectionType) < 0)
 		return;
 	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;
 	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;
 	Py_INCREF(&PipeConnectionType);
 	PyModule_AddObject(module, "PipeConnection",
 			   (PyObject*)&PipeConnectionType);

 	/* Initialize win32 class and add to multiprocessing */
 	temp = create_win32_namespace();
 	if (!temp)
 		return;
 	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;
 	}
 	if (!SetConsoleCtrlHandler(ProcessingCtrlHandler, TRUE)) {
 		PyErr_SetFromWindowsErr(0);
 		return;
 	}
 #endif

 	/* Add configuration macros */
 	temp = PyDict_New();
 	if (!temp)
 		return;
 #define ADD_FLAG(name)						  \
 	value = Py_BuildValue("i", name);			  \
 	if (value == NULL) { Py_DECREF(temp); return; }		  \
 	if (PyDict_SetItemString(temp, #name, value) < 0) {	  \
 		Py_DECREF(temp); Py_DECREF(value); return; }	  \
 	Py_DECREF(value)

 #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
 	if (PyModule_AddObject(module, "flags", temp) < 0)
 		return;
 }
	/*
	* Extension module used by multiprocessing 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
	*/

	PyMODINIT_FUNC
	init_multiprocessing(void)
	{
	PyObject module, temp, *value;

	/* Initialize module */
	module = Py_InitModule("_multiprocessing", module_methods);
	if (!module)
	return;

	/* Get copy of objects from pickle */
	temp = PyImport_ImportModule(PICKLE_MODULE);
	if (!temp)
	return;
	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;
	BufferTooShort = PyObject_GetAttrString(temp, "BufferTooShort");
	Py_XDECREF(temp);

	/* Add connection type to module */
	if (PyType_Ready(&ConnectionType) < 0)
	return;
	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;
	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;
	Py_INCREF(&PipeConnectionType);
	PyModule_AddObject(module, "PipeConnection",
	(PyObject*)&PipeConnectionType);

	/* Initialize win32 class and add to multiprocessing */
	temp = create_win32_namespace();
	if (!temp)
	return;
	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;
	}
	if (!SetConsoleCtrlHandler(ProcessingCtrlHandler, TRUE)) {
	PyErr_SetFromWindowsErr(0);
	return;
	}
	#endif

	/* Add configuration macros */
	temp = PyDict_New();
	if (!temp)
	return;
	#define ADD_FLAG(name) \
	value = Py_BuildValue("i", name); \
	if (value == NULL) { Py_DECREF(temp); return; } \
	if (PyDict_SetItemString(temp, #name, value) < 0) { \
	Py_DECREF(temp); Py_DECREF(value); return; } \
	Py_DECREF(value)

	#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
	if (PyModule_AddObject(module, "flags", temp) < 0)
	return;
	}