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/*
* 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 *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_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;
}
#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("Nn",
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"},
{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;
/* Initialize module */
module = PyModule_Create(&multiprocessing_module);
if (!module)
return NULL;
/* Get copy of BufferTooShort */
temp = PyImport_ImportModule("multiprocessing");
if (!temp)
return NULL;
BufferTooShort = PyObject_GetAttrString(temp, "BufferTooShort");
Py_XDECREF(temp);
#if defined(MS_WINDOWS) || \
(defined(HAVE_SEM_OPEN) && !defined(POSIX_SEMAPHORES_NOT_ENABLED))
/* Add SemLock type to module */
if (PyType_Ready(&SemLockType) < 0)
return NULL;
Py_INCREF(&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(SemLockType.tp_dict, "SEM_VALUE_MAX",
py_sem_value_max);
}
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);
/* 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;
#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;
}
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