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6238d2b024
cpython/Modules/signalmodule.c
Martin v. Löwis 6238d2b024 Patch #569753: Remove support for WIN16. 
Rename all occurrences of MS_WIN32 to MS_WINDOWS.
2002-06-30 15:26:10 +00:00

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/* Signal module -- many thanks to Lance Ellinghaus */
/* XXX Signals should be recorded per thread, now we have thread state. */
#include "Python.h"
#include "intrcheck.h"
#ifdef MS_WINDOWS
#include <process.h>
#endif
#include <signal.h>
#ifndef SIG_ERR
#define SIG_ERR ((PyOS_sighandler_t)(-1))
#endif
#if defined(PYOS_OS2) && !defined(PYCC_GCC)
#define NSIG 12
#include <process.h>
#endif
#ifndef NSIG
# if defined(_NSIG)
# define NSIG _NSIG /* For BSD/SysV */
# elif defined(_SIGMAX)
# define NSIG (_SIGMAX + 1) /* For QNX */
# elif defined(SIGMAX)
# define NSIG (SIGMAX + 1) /* For djgpp */
# else
# define NSIG 64 /* Use a reasonable default value */
# endif
#endif
/*
NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS
When threads are supported, we want the following semantics:
- only the main thread can set a signal handler
- any thread can get a signal handler
- signals are only delivered to the main thread
I.e. we don't support "synchronous signals" like SIGFPE (catching
this doesn't make much sense in Python anyway) nor do we support
signals as a means of inter-thread communication, since not all
thread implementations support that (at least our thread library
doesn't).
We still have the problem that in some implementations signals
generated by the keyboard (e.g. SIGINT) are delivered to all
threads (e.g. SGI), while in others (e.g. Solaris) such signals are
delivered to one random thread (an intermediate possibility would
be to deliver it to the main thread -- POSIX?). For now, we have
a working implementation that works in all three cases -- the
handler ignores signals if getpid() isn't the same as in the main
thread. XXX This is a hack.
GNU pth is a user-space threading library, and as such, all threads
run within the same process. In this case, if the currently running
thread is not the main_thread, send the signal to the main_thread.
*/
#ifdef WITH_THREAD
#include <sys/types.h> /* For pid_t */
#include "pythread.h"
static long main_thread;
static pid_t main_pid;
#endif
static struct {
int tripped;
PyObject *func;
} Handlers[NSIG];
static int is_tripped = 0; /* Speed up sigcheck() when none tripped */
static PyObject *DefaultHandler;
static PyObject *IgnoreHandler;
static PyObject *IntHandler;
/* On Solaris 8, gcc will produce a warning that the function
declaration is not a prototype. This is caused by the definition of
SIG_DFL as (void (*)())0; the correct declaration would have been
(void (*)(int))0. */
static PyOS_sighandler_t old_siginthandler = SIG_DFL;
static PyObject *
signal_default_int_handler(PyObject *self, PyObject *args)
{
PyErr_SetNone(PyExc_KeyboardInterrupt);
return NULL;
}
PyDoc_STRVAR(default_int_handler_doc,
"default_int_handler(...)\n\
\n\
The default handler for SIGINT instated by Python.\n\
It raises KeyboardInterrupt.");
static int
checksignals_witharg(void * unused)
{
return PyErr_CheckSignals();
}
static void
signal_handler(int sig_num)
{
#ifdef WITH_THREAD
#ifdef WITH_PTH
if (PyThread_get_thread_ident() != main_thread) {
pth_raise(*(pth_t *) main_thread, sig_num);
return;
}
#endif
/* See NOTES section above */
if (getpid() == main_pid) {
#endif
is_tripped++;
Handlers[sig_num].tripped = 1;
Py_AddPendingCall(checksignals_witharg, NULL);
#ifdef WITH_THREAD
}
#endif
#ifdef SIGCHLD
if (sig_num == SIGCHLD) {
/* To avoid infinite recursion, this signal remains
reset until explicit re-instated.
Don't clear the 'func' field as it is our pointer
to the Python handler... */
return;
}
#endif
#ifdef HAVE_SIGINTERRUPT
siginterrupt(sig_num, 1);
#endif
PyOS_setsig(sig_num, signal_handler);
}
#ifdef HAVE_ALARM
static PyObject *
signal_alarm(PyObject *self, PyObject *args)
{
int t;
if (!PyArg_ParseTuple(args, "i:alarm", &t))
return NULL;
/* alarm() returns the number of seconds remaining */
return PyInt_FromLong((long)alarm(t));
}
PyDoc_STRVAR(alarm_doc,
"alarm(seconds)\n\
\n\
Arrange for SIGALRM to arrive after the given number of seconds.");
#endif
#ifdef HAVE_PAUSE
static PyObject *
signal_pause(PyObject *self)
{
Py_BEGIN_ALLOW_THREADS
(void)pause();
Py_END_ALLOW_THREADS
/* make sure that any exceptions that got raised are propagated
* back into Python
*/
if (PyErr_CheckSignals())
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(pause_doc,
"pause()\n\
\n\
Wait until a signal arrives.");
#endif
static PyObject *
signal_signal(PyObject *self, PyObject *args)
{
PyObject *obj;
int sig_num;
PyObject *old_handler;
void (*func)(int);
if (!PyArg_ParseTuple(args, "iO:signal", &sig_num, &obj))
return NULL;
#ifdef WITH_THREAD
if (PyThread_get_thread_ident() != main_thread) {
PyErr_SetString(PyExc_ValueError,
"signal only works in main thread");
return NULL;
}
#endif
if (sig_num < 1 || sig_num >= NSIG) {
PyErr_SetString(PyExc_ValueError,
"signal number out of range");
return NULL;
}
if (obj == IgnoreHandler)
func = SIG_IGN;
else if (obj == DefaultHandler)
func = SIG_DFL;
else if (!PyCallable_Check(obj)) {
PyErr_SetString(PyExc_TypeError,
"signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object");
return NULL;
}
else
func = signal_handler;
#ifdef HAVE_SIGINTERRUPT
siginterrupt(sig_num, 1);
#endif
if (PyOS_setsig(sig_num, func) == SIG_ERR) {
PyErr_SetFromErrno(PyExc_RuntimeError);
return NULL;
}
old_handler = Handlers[sig_num].func;
Handlers[sig_num].tripped = 0;
Py_INCREF(obj);
Handlers[sig_num].func = obj;
return old_handler;
}
PyDoc_STRVAR(signal_doc,
"signal(sig, action) -> action\n\
\n\
Set the action for the given signal. The action can be SIG_DFL,\n\
SIG_IGN, or a callable Python object. The previous action is\n\
returned. See getsignal() for possible return values.\n\
\n\
*** IMPORTANT NOTICE ***\n\
A signal handler function is called with two arguments:\n\
the first is the signal number, the second is the interrupted stack frame.");
static PyObject *
signal_getsignal(PyObject *self, PyObject *args)
{
int sig_num;
PyObject *old_handler;
if (!PyArg_ParseTuple(args, "i:getsignal", &sig_num))
return NULL;
if (sig_num < 1 || sig_num >= NSIG) {
PyErr_SetString(PyExc_ValueError,
"signal number out of range");
return NULL;
}
old_handler = Handlers[sig_num].func;
Py_INCREF(old_handler);
return old_handler;
}
PyDoc_STRVAR(getsignal_doc,
"getsignal(sig) -> action\n\
\n\
Return the current action for the given signal. The return value can be:\n\
SIG_IGN -- if the signal is being ignored\n\
SIG_DFL -- if the default action for the signal is in effect\n\
None -- if an unknown handler is in effect\n\
anything else -- the callable Python object used as a handler");
#ifdef HAVE_SIGPROCMASK /* we assume that having SIGPROCMASK is enough
to guarantee full POSIX signal handling */
/* returns 0 for success, <0 for failure (with exception set) */
static int
_signal_list_to_sigset(PyObject* seq, sigset_t* set, char* mesg)
{
int i, len, val;
seq = PySequence_Fast(seq, mesg);
if (!seq)
return -1;
len = PySequence_Fast_GET_SIZE(seq);
sigemptyset(set);
for (i = 0; i < len; i++) {
val = PyInt_AsLong(PySequence_Fast_GET_ITEM(seq, i));
if (val == -1 && PyErr_Occurred()) {
Py_DECREF(seq);
return -1;
}
if (sigaddset(set, val) < 0) {
Py_DECREF(seq);
PyErr_SetFromErrno(PyExc_ValueError);
return -1;
}
}
Py_DECREF(seq);
return 0;
}
static PyObject*
_signal_sigset_to_list(sigset_t* set)
{
PyObject* ret;
PyObject* ob;
int i;
ret = PyList_New(0);
if (!ret)
return NULL;
for (i = 1; i < NSIG; i++) {
if (sigismember(set, i)) {
ob = PyInt_FromLong(i);
if (!ob) {
Py_DECREF(ret);
return NULL;
}
PyList_Append(ret, ob);
Py_DECREF(ob);
}
}
return ret;
}
static PyObject*
signal_sigprocmask(PyObject* self, PyObject* args)
{
int how;
sigset_t newset, oldset;
PyObject* seq;
if (!PyArg_ParseTuple(args, "iO", &how, &seq))
return NULL;
if (_signal_list_to_sigset(seq, &newset,
"sigprocmask requires a sequence") < 0)
return NULL;
if (sigprocmask(how, &newset, &oldset) < 0) {
return PyErr_SetFromErrno(PyExc_ValueError);
}
if (PyErr_CheckSignals())
return NULL;
return _signal_sigset_to_list(&oldset);
}
PyDoc_STRVAR(sigprocmask_doc,
"sigprocmask(how, sigset) -> sigset\n\
\n\
Change the list of currently blocked signals. The parameter how should be\n\
one of SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK and sigset should be a\n\
sequence of signal numbers. The behaviour of the call depends on the value\n\
of how:\n\
\n\
SIG_BLOCK\n\
The set of blocked signals is the union of the current set and the\n\
sigset argument.\n\
SIG_UNBLOCK\n\
The signals in sigset are removed from the current set of blocked\n\
signals. It is legal to attempt to unblock a signal which is not\n\
blocked.\n\
SIG_SETMASK\n\
The set of blocked signals is set to the argument set.\n\
\n\
A list contating the numbers of the previously blocked signals is returned.");
static PyObject*
signal_sigpending(PyObject* self)
{
sigset_t set;
if (sigpending(&set) < 0) {
return PyErr_SetFromErrno(PyExc_ValueError);
}
return _signal_sigset_to_list(&set);
}
PyDoc_STRVAR(sigpending_doc,
"sigpending() -> sigset\n\
\n\
Return the set of pending signals, i.e. a list containing the numbers of\n\
those signals that have been raised while blocked.");
static PyObject*
signal_sigsuspend(PyObject* self, PyObject* arg)
{
sigset_t set;
if (_signal_list_to_sigset(arg, &set,
"sigsuspend requires a sequence") < 0)
return NULL;
Py_BEGIN_ALLOW_THREADS
sigsuspend(&set);
Py_END_ALLOW_THREADS
if (PyErr_CheckSignals())
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
PyDoc_STRVAR(sigsuspend_doc,
"sigsuspend(sigset) -> None\n\
\n\
Temporarily replace the signal mask with sigset (which should be a sequence\n\
of signal numbers) and suspend the process until a signal is received.");
#endif
/* List of functions defined in the module */
static PyMethodDef signal_methods[] = {
#ifdef HAVE_ALARM
{"alarm", signal_alarm, METH_VARARGS, alarm_doc},
#endif
{"signal", signal_signal, METH_VARARGS, signal_doc},
{"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc},
#ifdef HAVE_PAUSE
{"pause", (PyCFunction)signal_pause,
METH_NOARGS,pause_doc},
#endif
{"default_int_handler", signal_default_int_handler,
METH_VARARGS, default_int_handler_doc},
#ifdef HAVE_SIGPROCMASK
{"sigprocmask", (PyCFunction)signal_sigprocmask,
METH_VARARGS, sigprocmask_doc},
{"sigpending", (PyCFunction)signal_sigpending,
METH_NOARGS, sigpending_doc},
{"sigsuspend", (PyCFunction)signal_sigsuspend,
METH_O, sigsuspend_doc},
#endif
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(module_doc,
"This module provides mechanisms to use signal handlers in Python.\n\
\n\
Functions:\n\
\n\
alarm() -- cause SIGALRM after a specified time [Unix only]\n\
signal() -- set the action for a given signal\n\
getsignal() -- get the signal action for a given signal\n\
pause() -- wait until a signal arrives [Unix only]\n\
default_int_handler() -- default SIGINT handler\n\
\n\
sigpending() |\n\
sigprocmask() |-- posix signal mask handling [Unix only]\n\
sigsuspend() |\n\
\n\
Constants:\n\
\n\
SIG_DFL -- used to refer to the system default handler\n\
SIG_IGN -- used to ignore the signal\n\
NSIG -- number of defined signals\n\
\n\
SIGINT, SIGTERM, etc. -- signal numbers\n\
\n\
*** IMPORTANT NOTICE ***\n\
A signal handler function is called with two arguments:\n\
the first is the signal number, the second is the interrupted stack frame.");
DL_EXPORT(void)
initsignal(void)
{
PyObject *m, *d, *x;
int i;
#ifdef WITH_THREAD
main_thread = PyThread_get_thread_ident();
main_pid = getpid();
#endif
/* Create the module and add the functions */
m = Py_InitModule3("signal", signal_methods, module_doc);
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
x = DefaultHandler = PyLong_FromVoidPtr((void *)SIG_DFL);
if (!x || PyDict_SetItemString(d, "SIG_DFL", x) < 0)
goto finally;
x = IgnoreHandler = PyLong_FromVoidPtr((void *)SIG_IGN);
if (!x || PyDict_SetItemString(d, "SIG_IGN", x) < 0)
goto finally;
x = PyInt_FromLong((long)NSIG);
if (!x || PyDict_SetItemString(d, "NSIG", x) < 0)
goto finally;
Py_DECREF(x);
x = IntHandler = PyDict_GetItemString(d, "default_int_handler");
if (!x)
goto finally;
Py_INCREF(IntHandler);
Handlers[0].tripped = 0;
for (i = 1; i < NSIG; i++) {
void (*t)(int);
t = PyOS_getsig(i);
Handlers[i].tripped = 0;
if (t == SIG_DFL)
Handlers[i].func = DefaultHandler;
else if (t == SIG_IGN)
Handlers[i].func = IgnoreHandler;
else
Handlers[i].func = Py_None; /* None of our business */
Py_INCREF(Handlers[i].func);
}
if (Handlers[SIGINT].func == DefaultHandler) {
/* Install default int handler */
Py_INCREF(IntHandler);
Py_DECREF(Handlers[SIGINT].func);
Handlers[SIGINT].func = IntHandler;
old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
}
#ifdef SIGHUP
x = PyInt_FromLong(SIGHUP);
PyDict_SetItemString(d, "SIGHUP", x);
Py_XDECREF(x);
#endif
#ifdef SIGINT
x = PyInt_FromLong(SIGINT);
PyDict_SetItemString(d, "SIGINT", x);
Py_XDECREF(x);
#endif
#ifdef SIGBREAK
x = PyInt_FromLong(SIGBREAK);
PyDict_SetItemString(d, "SIGBREAK", x);
Py_XDECREF(x);
#endif
#ifdef SIGQUIT
x = PyInt_FromLong(SIGQUIT);
PyDict_SetItemString(d, "SIGQUIT", x);
Py_XDECREF(x);
#endif
#ifdef SIGILL
x = PyInt_FromLong(SIGILL);
PyDict_SetItemString(d, "SIGILL", x);
Py_XDECREF(x);
#endif
#ifdef SIGTRAP
x = PyInt_FromLong(SIGTRAP);
PyDict_SetItemString(d, "SIGTRAP", x);
Py_XDECREF(x);
#endif
#ifdef SIGIOT
x = PyInt_FromLong(SIGIOT);
PyDict_SetItemString(d, "SIGIOT", x);
Py_XDECREF(x);
#endif
#ifdef SIGABRT
x = PyInt_FromLong(SIGABRT);
PyDict_SetItemString(d, "SIGABRT", x);
Py_XDECREF(x);
#endif
#ifdef SIGEMT
x = PyInt_FromLong(SIGEMT);
PyDict_SetItemString(d, "SIGEMT", x);
Py_XDECREF(x);
#endif
#ifdef SIGFPE
x = PyInt_FromLong(SIGFPE);
PyDict_SetItemString(d, "SIGFPE", x);
Py_XDECREF(x);
#endif
#ifdef SIGKILL
x = PyInt_FromLong(SIGKILL);
PyDict_SetItemString(d, "SIGKILL", x);
Py_XDECREF(x);
#endif
#ifdef SIGBUS
x = PyInt_FromLong(SIGBUS);
PyDict_SetItemString(d, "SIGBUS", x);
Py_XDECREF(x);
#endif
#ifdef SIGSEGV
x = PyInt_FromLong(SIGSEGV);
PyDict_SetItemString(d, "SIGSEGV", x);
Py_XDECREF(x);
#endif
#ifdef SIGSYS
x = PyInt_FromLong(SIGSYS);
PyDict_SetItemString(d, "SIGSYS", x);
Py_XDECREF(x);
#endif
#ifdef SIGPIPE
x = PyInt_FromLong(SIGPIPE);
PyDict_SetItemString(d, "SIGPIPE", x);
Py_XDECREF(x);
#endif
#ifdef SIGALRM
x = PyInt_FromLong(SIGALRM);
PyDict_SetItemString(d, "SIGALRM", x);
Py_XDECREF(x);
#endif
#ifdef SIGTERM
x = PyInt_FromLong(SIGTERM);
PyDict_SetItemString(d, "SIGTERM", x);
Py_XDECREF(x);
#endif
#ifdef SIGUSR1
x = PyInt_FromLong(SIGUSR1);
PyDict_SetItemString(d, "SIGUSR1", x);
Py_XDECREF(x);
#endif
#ifdef SIGUSR2
x = PyInt_FromLong(SIGUSR2);
PyDict_SetItemString(d, "SIGUSR2", x);
Py_XDECREF(x);
#endif
#ifdef SIGCLD
x = PyInt_FromLong(SIGCLD);
PyDict_SetItemString(d, "SIGCLD", x);
Py_XDECREF(x);
#endif
#ifdef SIGCHLD
x = PyInt_FromLong(SIGCHLD);
PyDict_SetItemString(d, "SIGCHLD", x);
Py_XDECREF(x);
#endif
#ifdef SIGPWR
x = PyInt_FromLong(SIGPWR);
PyDict_SetItemString(d, "SIGPWR", x);
Py_XDECREF(x);
#endif
#ifdef SIGIO
x = PyInt_FromLong(SIGIO);
PyDict_SetItemString(d, "SIGIO", x);
Py_XDECREF(x);
#endif
#ifdef SIGURG
x = PyInt_FromLong(SIGURG);
PyDict_SetItemString(d, "SIGURG", x);
Py_XDECREF(x);
#endif
#ifdef SIGWINCH
x = PyInt_FromLong(SIGWINCH);
PyDict_SetItemString(d, "SIGWINCH", x);
Py_XDECREF(x);
#endif
#ifdef SIGPOLL
x = PyInt_FromLong(SIGPOLL);
PyDict_SetItemString(d, "SIGPOLL", x);
Py_XDECREF(x);
#endif
#ifdef SIGSTOP
x = PyInt_FromLong(SIGSTOP);
PyDict_SetItemString(d, "SIGSTOP", x);
Py_XDECREF(x);
#endif
#ifdef SIGTSTP
x = PyInt_FromLong(SIGTSTP);
PyDict_SetItemString(d, "SIGTSTP", x);
Py_XDECREF(x);
#endif
#ifdef SIGCONT
x = PyInt_FromLong(SIGCONT);
PyDict_SetItemString(d, "SIGCONT", x);
Py_XDECREF(x);
#endif
#ifdef SIGTTIN
x = PyInt_FromLong(SIGTTIN);
PyDict_SetItemString(d, "SIGTTIN", x);
Py_XDECREF(x);
#endif
#ifdef SIGTTOU
x = PyInt_FromLong(SIGTTOU);
PyDict_SetItemString(d, "SIGTTOU", x);
Py_XDECREF(x);
#endif
#ifdef SIGVTALRM
x = PyInt_FromLong(SIGVTALRM);
PyDict_SetItemString(d, "SIGVTALRM", x);
Py_XDECREF(x);
#endif
#ifdef SIGPROF
x = PyInt_FromLong(SIGPROF);
PyDict_SetItemString(d, "SIGPROF", x);
Py_XDECREF(x);
#endif
#ifdef SIGXCPU
x = PyInt_FromLong(SIGXCPU);
PyDict_SetItemString(d, "SIGXCPU", x);
Py_XDECREF(x);
#endif
#ifdef SIGXFSZ
x = PyInt_FromLong(SIGXFSZ);
PyDict_SetItemString(d, "SIGXFSZ", x);
Py_XDECREF(x);
#endif
#ifdef SIGINFO
x = PyInt_FromLong(SIGINFO);
PyDict_SetItemString(d, "SIGINFO", x);
Py_XDECREF(x);
#endif
#ifdef HAVE_SIGPROCMASK
x = PyInt_FromLong(SIG_BLOCK);
PyDict_SetItemString(d, "SIG_BLOCK", x);
Py_XDECREF(x);
x = PyInt_FromLong(SIG_UNBLOCK);
PyDict_SetItemString(d, "SIG_UNBLOCK", x);
Py_XDECREF(x);
x = PyInt_FromLong(SIG_SETMASK);
PyDict_SetItemString(d, "SIG_SETMASK", x);
Py_XDECREF(x);
#endif
if (!PyErr_Occurred())
return;
/* Check for errors */
finally:
return;
}
static void
finisignal(void)
{
int i;
PyObject *func;
PyOS_setsig(SIGINT, old_siginthandler);
old_siginthandler = SIG_DFL;
for (i = 1; i < NSIG; i++) {
func = Handlers[i].func;
Handlers[i].tripped = 0;
Handlers[i].func = NULL;
if (i != SIGINT && func != NULL && func != Py_None &&
func != DefaultHandler && func != IgnoreHandler)
PyOS_setsig(i, SIG_DFL);
Py_XDECREF(func);
}
Py_XDECREF(IntHandler);
IntHandler = NULL;
Py_XDECREF(DefaultHandler);
DefaultHandler = NULL;
Py_XDECREF(IgnoreHandler);
IgnoreHandler = NULL;
}
/* Declared in pyerrors.h */
int
PyErr_CheckSignals(void)
{
int i;
PyObject *f;
if (!is_tripped)
return 0;
#ifdef WITH_THREAD
if (PyThread_get_thread_ident() != main_thread)
return 0;
#endif
if (!(f = PyEval_GetFrame()))
f = Py_None;
for (i = 1; i < NSIG; i++) {
if (Handlers[i].tripped) {
PyObject *result = NULL;
PyObject *arglist = Py_BuildValue("(iO)", i, f);
Handlers[i].tripped = 0;
if (arglist) {
result = PyEval_CallObject(Handlers[i].func,
arglist);
Py_DECREF(arglist);
}
if (!result)
return -1;
Py_DECREF(result);
}
}
is_tripped = 0;
return 0;
}
/* Replacements for intrcheck.c functionality
* Declared in pyerrors.h
*/
void
PyErr_SetInterrupt(void)
{
is_tripped++;
Handlers[SIGINT].tripped = 1;
Py_AddPendingCall((int (*)(void *))PyErr_CheckSignals, NULL);
}
void
PyOS_InitInterrupts(void)
{
initsignal();
_PyImport_FixupExtension("signal", "signal");
}
void
PyOS_FiniInterrupts(void)
{
finisignal();
}
int
PyOS_InterruptOccurred(void)
{
if (Handlers[SIGINT].tripped) {
#ifdef WITH_THREAD
if (PyThread_get_thread_ident() != main_thread)
return 0;
#endif
Handlers[SIGINT].tripped = 0;
return 1;
}
return 0;
}
void
PyOS_AfterFork(void)
{
#ifdef WITH_THREAD
PyEval_ReInitThreads();
main_thread = PyThread_get_thread_ident();
main_pid = getpid();
#endif
}
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