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/* A test module that spawns a thread and run a function there */
#include <Python.h>
#include <pthread.h>
struct thread_data {
PyInterpreterState *interp;
PyObject *callback;
};
static void *thread_function(void* ptr) {
struct thread_data *data = (struct thread_data *)ptr;
PyInterpreterState *interp = data->interp;
/* Assuming you have access to an interpreter object, the typical
* idiom for calling into Python from a C thread is: */
PyThreadState *tstate;
PyObject *result;
/* interp is your reference to an interpreter object. */
tstate = PyThreadState_New(interp);
PyEval_AcquireThread(tstate);
/* Perform Python actions here. */
result = PyObject_CallFunction(data->callback,
"l", (long)pthread_self());
if (!result)
PyErr_Print();
else
Py_DECREF(result);
Py_DECREF(data->callback);
/* XXX Python examples don't mention it, but docs say that
* PyThreadState_Delete requires it. */
PyThreadState_Clear(tstate);
/* Release the thread. No Python API allowed beyond this point. */
PyEval_ReleaseThread(tstate);
/* You can either delete the thread state, or save it
until you need it the next time. */
PyThreadState_Delete(tstate);
free(data);
return NULL;
}
static PyObject *
run_callback(PyObject *self, PyObject *callback)
{
pthread_t thread;
struct thread_data *data = malloc(sizeof(struct thread_data));
Py_INCREF(callback);
data->interp = PyThreadState_Get()->interp;
data->callback = callback;
pthread_create(&thread, NULL, thread_function, (void*)data);
Py_RETURN_NONE;
}
static PyMethodDef module_functions[] = {
{"callInThread", (PyCFunction)run_callback, METH_O, NULL},
{NULL, NULL} /* Sentinel */
};
#ifdef __GNUC__
extern __attribute__((visibility("default")))
#else
extern __declspec(dllexport)
#endif
PyMODINIT_FUNC
initcallback_in_thread(void)
{
PyObject *m;
m = Py_InitModule("callback_in_thread", module_functions);
if (m == NULL)
return;
PyEval_InitThreads();
}
/*
cc -g -O0 -c callback_in_thread.c -I /usr/include/python2.6 -fPIC && ld -g -O0 callback_in_thread.o --shared -o callback_in_thread.so && gdb --args ~/python/cpython2.7/python -c "from __future__ import print_function; import threading, time; from callback_in_thread import callInThread; callInThread(print); time.sleep(1)"
cc -g -O0 -c callback_in_thread.c -I ~/pypy/pypy/include -fPIC && ld -g -O0 callback_in_thread.o --shared -o callback_in_thread.pypy-19.so && gdb --args ~/pypy/pypy/pypy/pypy-c -c "from __future__ import print_function; import threading, time; from callback_in_thread import callInThread; callInThread(print); time.sleep(1)"
*/
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