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cpython/Modules/_interpqueuesmodule.c

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/* interpreters module */
/* low-level access to interpreter primitives */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_crossinterp.h" // struct _xid
#define REGISTERS_HEAP_TYPES
#include "_interpreters_common.h"
#undef REGISTERS_HEAP_TYPES
#define MODULE_NAME _interpqueues
#define MODULE_NAME_STR Py_STRINGIFY(MODULE_NAME)
#define MODINIT_FUNC_NAME RESOLVE_MODINIT_FUNC_NAME(MODULE_NAME)
#define GLOBAL_MALLOC(TYPE) \
PyMem_RawMalloc(sizeof(TYPE))
#define GLOBAL_FREE(VAR) \
PyMem_RawFree(VAR)
#define XID_IGNORE_EXC 1
#define XID_FREE 2
static int
_release_xid_data(_PyCrossInterpreterData *data, int flags)
{
int ignoreexc = flags & XID_IGNORE_EXC;
PyObject *exc;
if (ignoreexc) {
exc = PyErr_GetRaisedException();
}
int res;
if (flags & XID_FREE) {
res = _PyCrossInterpreterData_ReleaseAndRawFree(data);
}
else {
res = _PyCrossInterpreterData_Release(data);
}
if (res < 0) {
/* The owning interpreter is already destroyed. */
if (ignoreexc) {
// XXX Emit a warning?
PyErr_Clear();
}
}
if (flags & XID_FREE) {
/* Either way, we free the data. */
}
if (ignoreexc) {
PyErr_SetRaisedException(exc);
}
return res;
}
static PyInterpreterState *
_get_current_interp(void)
{
// PyInterpreterState_Get() aborts if lookup fails, so don't need
// to check the result for NULL.
return PyInterpreterState_Get();
}
static PyObject *
_get_current_module(void)
{
PyObject *name = PyUnicode_FromString(MODULE_NAME_STR);
if (name == NULL) {
return NULL;
}
PyObject *mod = PyImport_GetModule(name);
Py_DECREF(name);
if (mod == NULL) {
return NULL;
}
assert(mod != Py_None);
return mod;
}
struct idarg_int64_converter_data {
// input:
const char *label;
// output:
int64_t id;
};
static int
idarg_int64_converter(PyObject *arg, void *ptr)
{
int64_t id;
struct idarg_int64_converter_data *data = ptr;
const char *label = data->label;
if (label == NULL) {
label = "ID";
}
if (PyIndex_Check(arg)) {
int overflow = 0;
id = PyLong_AsLongLongAndOverflow(arg, &overflow);
if (id == -1 && PyErr_Occurred()) {
return 0;
}
else if (id == -1 && overflow == 1) {
PyErr_Format(PyExc_OverflowError,
"max %s is %lld, got %R", label, INT64_MAX, arg);
return 0;
}
else if (id < 0) {
PyErr_Format(PyExc_ValueError,
"%s must be a non-negative int, got %R", label, arg);
return 0;
}
}
else {
PyErr_Format(PyExc_TypeError,
"%s must be an int, got %.100s",
label, Py_TYPE(arg)->tp_name);
return 0;
}
data->id = id;
return 1;
}
static int
ensure_highlevel_module_loaded(void)
{
PyObject *highlevel = PyImport_ImportModule("interpreters.queues");
if (highlevel == NULL) {
PyErr_Clear();
highlevel = PyImport_ImportModule("test.support.interpreters.queues");
if (highlevel == NULL) {
return -1;
}
}
Py_DECREF(highlevel);
return 0;
}
/* module state *************************************************************/
typedef struct {
/* external types (added at runtime by interpreters module) */
PyTypeObject *queue_type;
/* QueueError (and its subclasses) */
PyObject *QueueError;
PyObject *QueueNotFoundError;
PyObject *QueueEmpty;
PyObject *QueueFull;
} module_state;
static inline module_state *
get_module_state(PyObject *mod)
{
assert(mod != NULL);
module_state *state = PyModule_GetState(mod);
assert(state != NULL);
return state;
}
static int
traverse_module_state(module_state *state, visitproc visit, void *arg)
{
/* external types */
Py_VISIT(state->queue_type);
/* QueueError */
Py_VISIT(state->QueueError);
Py_VISIT(state->QueueNotFoundError);
Py_VISIT(state->QueueEmpty);
Py_VISIT(state->QueueFull);
return 0;
}
static int
clear_module_state(module_state *state)
{
/* external types */
if (state->queue_type != NULL) {
(void)clear_xid_class(state->queue_type);
}
Py_CLEAR(state->queue_type);
/* QueueError */
Py_CLEAR(state->QueueError);
Py_CLEAR(state->QueueNotFoundError);
Py_CLEAR(state->QueueEmpty);
Py_CLEAR(state->QueueFull);
return 0;
}
/* error codes **************************************************************/
#define ERR_EXCEPTION_RAISED (-1)
// multi-queue errors
#define ERR_QUEUES_ALLOC (-11)
#define ERR_QUEUE_ALLOC (-12)
#define ERR_NO_NEXT_QUEUE_ID (-13)
#define ERR_QUEUE_NOT_FOUND (-14)
// single-queue errors
#define ERR_QUEUE_EMPTY (-21)
#define ERR_QUEUE_FULL (-22)
#define ERR_QUEUE_NEVER_BOUND (-23)
static int ensure_external_exc_types(module_state *);
static int
resolve_module_errcode(module_state *state, int errcode, int64_t qid,
PyObject **p_exctype, PyObject **p_msgobj)
{
PyObject *exctype = NULL;
PyObject *msg = NULL;
switch (errcode) {
case ERR_NO_NEXT_QUEUE_ID:
exctype = state->QueueError;
msg = PyUnicode_FromString("ran out of queue IDs");
break;
case ERR_QUEUE_NOT_FOUND:
exctype = state->QueueNotFoundError;
msg = PyUnicode_FromFormat("queue %" PRId64 " not found", qid);
break;
case ERR_QUEUE_EMPTY:
if (ensure_external_exc_types(state) < 0) {
return -1;
}
exctype = state->QueueEmpty;
msg = PyUnicode_FromFormat("queue %" PRId64 " is empty", qid);
break;
case ERR_QUEUE_FULL:
if (ensure_external_exc_types(state) < 0) {
return -1;
}
exctype = state->QueueFull;
msg = PyUnicode_FromFormat("queue %" PRId64 " is full", qid);
break;
case ERR_QUEUE_NEVER_BOUND:
exctype = state->QueueError;
msg = PyUnicode_FromFormat("queue %" PRId64 " never bound", qid);
break;
default:
PyErr_Format(PyExc_ValueError,
"unsupported error code %d", errcode);
return -1;
}
if (msg == NULL) {
assert(PyErr_Occurred());
return -1;
}
*p_exctype = exctype;
*p_msgobj = msg;
return 0;
}
/* QueueError ***************************************************************/
static int
add_exctype(PyObject *mod, PyObject **p_state_field,
const char *qualname, const char *doc, PyObject *base)
{
#ifndef NDEBUG
const char *dot = strrchr(qualname, '.');
assert(dot != NULL);
const char *name = dot+1;
assert(*p_state_field == NULL);
assert(!PyObject_HasAttrStringWithError(mod, name));
#endif
PyObject *exctype = PyErr_NewExceptionWithDoc(qualname, doc, base, NULL);
if (exctype == NULL) {
return -1;
}
if (PyModule_AddType(mod, (PyTypeObject *)exctype) < 0) {
Py_DECREF(exctype);
return -1;
}
*p_state_field = exctype;
return 0;
}
static int
add_QueueError(PyObject *mod)
{
module_state *state = get_module_state(mod);
#define PREFIX "test.support.interpreters."
#define ADD_EXCTYPE(NAME, BASE, DOC) \
assert(state->NAME == NULL); \
if (add_exctype(mod, &state->NAME, PREFIX #NAME, DOC, BASE) < 0) { \
return -1; \
}
ADD_EXCTYPE(QueueError, PyExc_RuntimeError,
"Indicates that a queue-related error happened.")
ADD_EXCTYPE(QueueNotFoundError, state->QueueError, NULL)
// QueueEmpty and QueueFull are set by set_external_exc_types().
state->QueueEmpty = NULL;
state->QueueFull = NULL;
#undef ADD_EXCTYPE
#undef PREFIX
return 0;
}
static int
set_external_exc_types(module_state *state,
PyObject *emptyerror, PyObject *fullerror)
{
if (state->QueueEmpty != NULL) {
assert(state->QueueFull != NULL);
Py_CLEAR(state->QueueEmpty);
Py_CLEAR(state->QueueFull);
}
else {
assert(state->QueueFull == NULL);
}
assert(PyObject_IsSubclass(emptyerror, state->QueueError));
assert(PyObject_IsSubclass(fullerror, state->QueueError));
state->QueueEmpty = Py_NewRef(emptyerror);
state->QueueFull = Py_NewRef(fullerror);
return 0;
}
static int
ensure_external_exc_types(module_state *state)
{
if (state->QueueEmpty != NULL) {
assert(state->QueueFull != NULL);
return 0;
}
assert(state->QueueFull == NULL);
// Force the module to be loaded, to register the type.
if (ensure_highlevel_module_loaded() < 0) {
return -1;
}
assert(state->QueueEmpty != NULL);
assert(state->QueueFull != NULL);
return 0;
}
static int
handle_queue_error(int err, PyObject *mod, int64_t qid)
{
if (err == 0) {
assert(!PyErr_Occurred());
return 0;
}
assert(err < 0);
assert((err == -1) == (PyErr_Occurred() != NULL));
module_state *state;
switch (err) {
case ERR_QUEUE_ALLOC: // fall through
case ERR_QUEUES_ALLOC:
PyErr_NoMemory();
break;
case -1:
return -1;
default:
state = get_module_state(mod);
assert(state->QueueError != NULL);
PyObject *exctype = NULL;
PyObject *msg = NULL;
if (resolve_module_errcode(state, err, qid, &exctype, &msg) < 0) {
return -1;
}
PyObject *exc = PyObject_CallOneArg(exctype, msg);
Py_DECREF(msg);
if (exc == NULL) {
return -1;
}
PyErr_SetObject(exctype, exc);
Py_DECREF(exc);
}
return 1;
}
/* the basic queue **********************************************************/
struct _queueitem;
typedef struct _queueitem {
_PyCrossInterpreterData *data;
int fmt;
struct _queueitem *next;
} _queueitem;
static void
_queueitem_init(_queueitem *item,
_PyCrossInterpreterData *data, int fmt)
{
*item = (_queueitem){
.data = data,
.fmt = fmt,
};
}
static void
_queueitem_clear(_queueitem *item)
{
item->next = NULL;
if (item->data != NULL) {
// It was allocated in queue_put().
(void)_release_xid_data(item->data, XID_IGNORE_EXC & XID_FREE);
item->data = NULL;
}
}
static _queueitem *
_queueitem_new(_PyCrossInterpreterData *data, int fmt)
{
_queueitem *item = GLOBAL_MALLOC(_queueitem);
if (item == NULL) {
PyErr_NoMemory();
return NULL;
}
_queueitem_init(item, data, fmt);
return item;
}
static void
_queueitem_free(_queueitem *item)
{
_queueitem_clear(item);
GLOBAL_FREE(item);
}
static void
_queueitem_free_all(_queueitem *item)
{
while (item != NULL) {
_queueitem *last = item;
item = item->next;
_queueitem_free(last);
}
}
static void
_queueitem_popped(_queueitem *item,
_PyCrossInterpreterData **p_data, int *p_fmt)
{
*p_data = item->data;
*p_fmt = item->fmt;
// We clear them here, so they won't be released in _queueitem_clear().
item->data = NULL;
_queueitem_free(item);
}
/* the queue */
typedef struct _queue {
Py_ssize_t num_waiters; // protected by global lock
PyThread_type_lock mutex;
int alive;
struct _queueitems {
Py_ssize_t maxsize;
Py_ssize_t count;
_queueitem *first;
_queueitem *last;
} items;
int fmt;
} _queue;
static int
_queue_init(_queue *queue, Py_ssize_t maxsize, int fmt)
{
PyThread_type_lock mutex = PyThread_allocate_lock();
if (mutex == NULL) {
return ERR_QUEUE_ALLOC;
}
*queue = (_queue){
.mutex = mutex,
.alive = 1,
.items = {
.maxsize = maxsize,
},
.fmt = fmt,
};
return 0;
}
static void
_queue_clear(_queue *queue)
{
assert(!queue->alive);
assert(queue->num_waiters == 0);
_queueitem_free_all(queue->items.first);
assert(queue->mutex != NULL);
PyThread_free_lock(queue->mutex);
*queue = (_queue){0};
}
static void _queue_free(_queue *);
static void
_queue_kill_and_wait(_queue *queue)
{
// Mark it as dead.
PyThread_acquire_lock(queue->mutex, WAIT_LOCK);
assert(queue->alive);
queue->alive = 0;
PyThread_release_lock(queue->mutex);
// Wait for all waiters to fail.
while (queue->num_waiters > 0) {
PyThread_acquire_lock(queue->mutex, WAIT_LOCK);
PyThread_release_lock(queue->mutex);
};
}
static void
_queue_mark_waiter(_queue *queue, PyThread_type_lock parent_mutex)
{
if (parent_mutex != NULL) {
PyThread_acquire_lock(parent_mutex, WAIT_LOCK);
queue->num_waiters += 1;
PyThread_release_lock(parent_mutex);
}
else {
// The caller must be holding the parent lock already.
queue->num_waiters += 1;
}
}
static void
_queue_unmark_waiter(_queue *queue, PyThread_type_lock parent_mutex)
{
if (parent_mutex != NULL) {
PyThread_acquire_lock(parent_mutex, WAIT_LOCK);
queue->num_waiters -= 1;
PyThread_release_lock(parent_mutex);
}
else {
// The caller must be holding the parent lock already.
queue->num_waiters -= 1;
}
}
static int
_queue_lock(_queue *queue)
{
// The queue must be marked as a waiter already.
PyThread_acquire_lock(queue->mutex, WAIT_LOCK);
if (!queue->alive) {
PyThread_release_lock(queue->mutex);
return ERR_QUEUE_NOT_FOUND;
}
return 0;
}
static void
_queue_unlock(_queue *queue)
{
PyThread_release_lock(queue->mutex);
}
static int
_queue_add(_queue *queue, _PyCrossInterpreterData *data, int fmt)
{
int err = _queue_lock(queue);
if (err < 0) {
return err;
}
Py_ssize_t maxsize = queue->items.maxsize;
if (maxsize <= 0) {
maxsize = PY_SSIZE_T_MAX;
}
if (queue->items.count >= maxsize) {
_queue_unlock(queue);
return ERR_QUEUE_FULL;
}
_queueitem *item = _queueitem_new(data, fmt);
if (item == NULL) {
_queue_unlock(queue);
return -1;
}
queue->items.count += 1;
if (queue->items.first == NULL) {
queue->items.first = item;
}
else {
queue->items.last->next = item;
}
queue->items.last = item;
_queue_unlock(queue);
return 0;
}
static int
_queue_next(_queue *queue,
_PyCrossInterpreterData **p_data, int *p_fmt)
{
int err = _queue_lock(queue);
if (err < 0) {
return err;
}
assert(queue->items.count >= 0);
_queueitem *item = queue->items.first;
if (item == NULL) {
_queue_unlock(queue);
return ERR_QUEUE_EMPTY;
}
queue->items.first = item->next;
if (queue->items.last == item) {
queue->items.last = NULL;
}
queue->items.count -= 1;
_queueitem_popped(item, p_data, p_fmt);
_queue_unlock(queue);
return 0;
}
static int
_queue_get_maxsize(_queue *queue, Py_ssize_t *p_maxsize)
{
int err = _queue_lock(queue);
if (err < 0) {
return err;
}
*p_maxsize = queue->items.maxsize;
_queue_unlock(queue);
return 0;
}
static int
_queue_is_full(_queue *queue, int *p_is_full)
{
int err = _queue_lock(queue);
if (err < 0) {
return err;
}
assert(queue->items.count <= queue->items.maxsize);
*p_is_full = queue->items.count == queue->items.maxsize;
_queue_unlock(queue);
return 0;
}
static int
_queue_get_count(_queue *queue, Py_ssize_t *p_count)
{
int err = _queue_lock(queue);
if (err < 0) {
return err;
}
*p_count = queue->items.count;
_queue_unlock(queue);
return 0;
}
static void
_queue_clear_interpreter(_queue *queue, int64_t interpid)
{
int err = _queue_lock(queue);
if (err == ERR_QUEUE_NOT_FOUND) {
// The queue is already destroyed, so there's nothing to clear.
assert(!PyErr_Occurred());
return;
}
assert(err == 0); // There should be no other errors.
_queueitem *prev = NULL;
_queueitem *next = queue->items.first;
while (next != NULL) {
_queueitem *item = next;
next = item->next;
if (_PyCrossInterpreterData_INTERPID(item->data) == interpid) {
if (prev == NULL) {
queue->items.first = item->next;
}
else {
prev->next = item->next;
}
_queueitem_free(item);
queue->items.count -= 1;
}
else {
prev = item;
}
}
_queue_unlock(queue);
}
/* external queue references ************************************************/
struct _queueref;
typedef struct _queueref {
struct _queueref *next;
int64_t qid;
Py_ssize_t refcount;
_queue *queue;
} _queueref;
static _queueref *
_queuerefs_find(_queueref *first, int64_t qid, _queueref **pprev)
{
_queueref *prev = NULL;
_queueref *ref = first;
while (ref != NULL) {
if (ref->qid == qid) {
break;
}
prev = ref;
ref = ref->next;
}
if (pprev != NULL) {
*pprev = prev;
}
return ref;
}
static void
_queuerefs_clear(_queueref *head)
{
_queueref *next = head;
while (next != NULL) {
_queueref *ref = next;
next = ref->next;
#ifdef Py_DEBUG
int64_t qid = ref->qid;
fprintf(stderr, "queue %" PRId64 " still exists\n", qid);
#endif
_queue *queue = ref->queue;
GLOBAL_FREE(ref);
_queue_kill_and_wait(queue);
#ifdef Py_DEBUG
if (queue->items.count > 0) {
fprintf(stderr, "queue %" PRId64 " still holds %zd items\n",
qid, queue->items.count);
}
#endif
_queue_free(queue);
}
}
/* a collection of queues ***************************************************/
typedef struct _queues {
PyThread_type_lock mutex;
_queueref *head;
int64_t count;
int64_t next_id;
} _queues;
static void
_queues_init(_queues *queues, PyThread_type_lock mutex)
{
queues->mutex = mutex;
queues->head = NULL;
queues->count = 0;
queues->next_id = 1;
}
static void
_queues_fini(_queues *queues)
{
if (queues->count > 0) {
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
assert((queues->count == 0) != (queues->head != NULL));
_queueref *head = queues->head;
queues->head = NULL;
queues->count = 0;
PyThread_release_lock(queues->mutex);
_queuerefs_clear(head);
}
if (queues->mutex != NULL) {
PyThread_free_lock(queues->mutex);
queues->mutex = NULL;
}
}
static int64_t
_queues_next_id(_queues *queues) // needs lock
{
int64_t qid = queues->next_id;
if (qid < 0) {
/* overflow */
return ERR_NO_NEXT_QUEUE_ID;
}
queues->next_id += 1;
return qid;
}
static int
_queues_lookup(_queues *queues, int64_t qid, _queue **res)
{
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
_queueref *ref = _queuerefs_find(queues->head, qid, NULL);
if (ref == NULL) {
PyThread_release_lock(queues->mutex);
return ERR_QUEUE_NOT_FOUND;
}
assert(ref->queue != NULL);
_queue *queue = ref->queue;
_queue_mark_waiter(queue, NULL);
// The caller must unmark it.
PyThread_release_lock(queues->mutex);
*res = queue;
return 0;
}
static int64_t
_queues_add(_queues *queues, _queue *queue)
{
int64_t qid = -1;
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
// Create a new ref.
int64_t _qid = _queues_next_id(queues);
if (_qid < 0) {
goto done;
}
_queueref *ref = GLOBAL_MALLOC(_queueref);
if (ref == NULL) {
qid = ERR_QUEUE_ALLOC;
goto done;
}
*ref = (_queueref){
.qid = _qid,
.queue = queue,
};
// Add it to the list.
// We assume that the queue is a new one (not already in the list).
ref->next = queues->head;
queues->head = ref;
queues->count += 1;
qid = _qid;
done:
PyThread_release_lock(queues->mutex);
return qid;
}
static void
_queues_remove_ref(_queues *queues, _queueref *ref, _queueref *prev,
_queue **p_queue)
{
assert(ref->queue != NULL);
if (ref == queues->head) {
queues->head = ref->next;
}
else {
prev->next = ref->next;
}
ref->next = NULL;
queues->count -= 1;
*p_queue = ref->queue;
ref->queue = NULL;
GLOBAL_FREE(ref);
}
static int
_queues_remove(_queues *queues, int64_t qid, _queue **p_queue)
{
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
_queueref *prev = NULL;
_queueref *ref = _queuerefs_find(queues->head, qid, &prev);
if (ref == NULL) {
PyThread_release_lock(queues->mutex);
return ERR_QUEUE_NOT_FOUND;
}
_queues_remove_ref(queues, ref, prev, p_queue);
PyThread_release_lock(queues->mutex);
return 0;
}
static int
_queues_incref(_queues *queues, int64_t qid)
{
// XXX Track interpreter IDs?
int res = -1;
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
_queueref *ref = _queuerefs_find(queues->head, qid, NULL);
if (ref == NULL) {
assert(!PyErr_Occurred());
res = ERR_QUEUE_NOT_FOUND;
goto done;
}
ref->refcount += 1;
res = 0;
done:
PyThread_release_lock(queues->mutex);
return res;
}
static int
_queues_decref(_queues *queues, int64_t qid)
{
int res = -1;
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
_queueref *prev = NULL;
_queueref *ref = _queuerefs_find(queues->head, qid, &prev);
if (ref == NULL) {
assert(!PyErr_Occurred());
res = ERR_QUEUE_NOT_FOUND;
goto finally;
}
if (ref->refcount == 0) {
res = ERR_QUEUE_NEVER_BOUND;
goto finally;
}
assert(ref->refcount > 0);
ref->refcount -= 1;
// Destroy if no longer used.
assert(ref->queue != NULL);
if (ref->refcount == 0) {
_queue *queue = NULL;
_queues_remove_ref(queues, ref, prev, &queue);
PyThread_release_lock(queues->mutex);
_queue_kill_and_wait(queue);
_queue_free(queue);
return 0;
}
res = 0;
finally:
PyThread_release_lock(queues->mutex);
return res;
}
struct queue_id_and_fmt {
int64_t id;
int fmt;
};
static struct queue_id_and_fmt *
_queues_list_all(_queues *queues, int64_t *count)
{
struct queue_id_and_fmt *qids = NULL;
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
struct queue_id_and_fmt *ids = PyMem_NEW(struct queue_id_and_fmt,
(Py_ssize_t)(queues->count));
if (ids == NULL) {
goto done;
}
_queueref *ref = queues->head;
for (int64_t i=0; ref != NULL; ref = ref->next, i++) {
ids[i].id = ref->qid;
assert(ref->queue != NULL);
ids[i].fmt = ref->queue->fmt;
}
*count = queues->count;
qids = ids;
done:
PyThread_release_lock(queues->mutex);
return qids;
}
static void
_queues_clear_interpreter(_queues *queues, int64_t interpid)
{
PyThread_acquire_lock(queues->mutex, WAIT_LOCK);
_queueref *ref = queues->head;
for (; ref != NULL; ref = ref->next) {
assert(ref->queue != NULL);
_queue_clear_interpreter(ref->queue, interpid);
}
PyThread_release_lock(queues->mutex);
}
/* "high"-level queue-related functions *************************************/
static void
_queue_free(_queue *queue)
{
_queue_clear(queue);
GLOBAL_FREE(queue);
}
// Create a new queue.
static int64_t
queue_create(_queues *queues, Py_ssize_t maxsize, int fmt)
{
_queue *queue = GLOBAL_MALLOC(_queue);
if (queue == NULL) {
return ERR_QUEUE_ALLOC;
}
int err = _queue_init(queue, maxsize, fmt);
if (err < 0) {
GLOBAL_FREE(queue);
return (int64_t)err;
}
int64_t qid = _queues_add(queues, queue);
if (qid < 0) {
_queue_clear(queue);
GLOBAL_FREE(queue);
}
return qid;
}
// Completely destroy the queue.
static int
queue_destroy(_queues *queues, int64_t qid)
{
_queue *queue = NULL;
int err = _queues_remove(queues, qid, &queue);
if (err < 0) {
return err;
}
_queue_kill_and_wait(queue);
_queue_free(queue);
return 0;
}
// Push an object onto the queue.
static int
queue_put(_queues *queues, int64_t qid, PyObject *obj, int fmt)
{
// Look up the queue.
_queue *queue = NULL;
int err = _queues_lookup(queues, qid, &queue);
if (err != 0) {
return err;
}
assert(queue != NULL);
// Convert the object to cross-interpreter data.
_PyCrossInterpreterData *data = GLOBAL_MALLOC(_PyCrossInterpreterData);
if (data == NULL) {
_queue_unmark_waiter(queue, queues->mutex);
return -1;
}
if (_PyObject_GetCrossInterpreterData(obj, data) != 0) {
_queue_unmark_waiter(queue, queues->mutex);
GLOBAL_FREE(data);
return -1;
}
// Add the data to the queue.
int res = _queue_add(queue, data, fmt);
_queue_unmark_waiter(queue, queues->mutex);
if (res != 0) {
// We may chain an exception here:
(void)_release_xid_data(data, 0);
GLOBAL_FREE(data);
return res;
}
return 0;
}
// Pop the next object off the queue. Fail if empty.
// XXX Support a "wait" mutex?
static int
queue_get(_queues *queues, int64_t qid, PyObject **res, int *p_fmt)
{
int err;
*res = NULL;
// Look up the queue.
_queue *queue = NULL;
err = _queues_lookup(queues, qid, &queue);
if (err != 0) {
return err;
}
// Past this point we are responsible for releasing the mutex.
assert(queue != NULL);
// Pop off the next item from the queue.
_PyCrossInterpreterData *data = NULL;
err = _queue_next(queue, &data, p_fmt);
_queue_unmark_waiter(queue, queues->mutex);
if (err != 0) {
return err;
}
else if (data == NULL) {
assert(!PyErr_Occurred());
return 0;
}
// Convert the data back to an object.
PyObject *obj = _PyCrossInterpreterData_NewObject(data);
if (obj == NULL) {
assert(PyErr_Occurred());
// It was allocated in queue_put(), so we free it.
(void)_release_xid_data(data, XID_IGNORE_EXC | XID_FREE);
return -1;
}
// It was allocated in queue_put(), so we free it.
int release_res = _release_xid_data(data, XID_FREE);
if (release_res < 0) {
// The source interpreter has been destroyed already.
assert(PyErr_Occurred());
Py_DECREF(obj);
return -1;
}
*res = obj;
return 0;
}
static int
queue_get_maxsize(_queues *queues, int64_t qid, Py_ssize_t *p_maxsize)
{
_queue *queue = NULL;
int err = _queues_lookup(queues, qid, &queue);
if (err < 0) {
return err;
}
err = _queue_get_maxsize(queue, p_maxsize);
_queue_unmark_waiter(queue, queues->mutex);
return err;
}
static int
queue_is_full(_queues *queues, int64_t qid, int *p_is_full)
{
_queue *queue = NULL;
int err = _queues_lookup(queues, qid, &queue);
if (err < 0) {
return err;
}
err = _queue_is_full(queue, p_is_full);
_queue_unmark_waiter(queue, queues->mutex);
return err;
}
static int
queue_get_count(_queues *queues, int64_t qid, Py_ssize_t *p_count)
{
_queue *queue = NULL;
int err = _queues_lookup(queues, qid, &queue);
if (err < 0) {
return err;
}
err = _queue_get_count(queue, p_count);
_queue_unmark_waiter(queue, queues->mutex);
return err;
}
/* external Queue objects ***************************************************/
static int _queueobj_shared(PyThreadState *,
PyObject *, _PyCrossInterpreterData *);
static int
set_external_queue_type(module_state *state, PyTypeObject *queue_type)
{
// Clear the old value if the .py module was reloaded.
if (state->queue_type != NULL) {
(void)clear_xid_class(state->queue_type);
Py_CLEAR(state->queue_type);
}
// Add and register the new type.
if (ensure_xid_class(queue_type, _queueobj_shared) < 0) {
return -1;
}
state->queue_type = (PyTypeObject *)Py_NewRef(queue_type);
return 0;
}
static PyTypeObject *
get_external_queue_type(PyObject *module)
{
module_state *state = get_module_state(module);
PyTypeObject *cls = state->queue_type;
if (cls == NULL) {
// Force the module to be loaded, to register the type.
if (ensure_highlevel_module_loaded() < 0) {
return NULL;
}
cls = state->queue_type;
assert(cls != NULL);
}
return cls;
}
// XXX Use a new __xid__ protocol instead?
struct _queueid_xid {
int64_t qid;
};
static _queues * _get_global_queues(void);
static void *
_queueid_xid_new(int64_t qid)
{
_queues *queues = _get_global_queues();
if (_queues_incref(queues, qid) < 0) {
return NULL;
}
struct _queueid_xid *data = PyMem_RawMalloc(sizeof(struct _queueid_xid));
if (data == NULL) {
_queues_incref(queues, qid);
return NULL;
}
data->qid = qid;
return (void *)data;
}
static void
_queueid_xid_free(void *data)
{
int64_t qid = ((struct _queueid_xid *)data)->qid;
PyMem_RawFree(data);
_queues *queues = _get_global_queues();
int res = _queues_decref(queues, qid);
if (res == ERR_QUEUE_NOT_FOUND) {
// Already destroyed.
// XXX Warn?
}
else {
assert(res == 0);
}
}
static PyObject *
_queueobj_from_xid(_PyCrossInterpreterData *data)
{
int64_t qid = *(int64_t *)_PyCrossInterpreterData_DATA(data);
PyObject *qidobj = PyLong_FromLongLong(qid);
if (qidobj == NULL) {
return NULL;
}
PyObject *mod = _get_current_module();
if (mod == NULL) {
// XXX import it?
PyErr_SetString(PyExc_RuntimeError,
MODULE_NAME_STR " module not imported yet");
return NULL;
}
PyTypeObject *cls = get_external_queue_type(mod);
Py_DECREF(mod);
if (cls == NULL) {
Py_DECREF(qidobj);
return NULL;
}
PyObject *obj = PyObject_CallOneArg((PyObject *)cls, (PyObject *)qidobj);
Py_DECREF(qidobj);
return obj;
}
static int
_queueobj_shared(PyThreadState *tstate, PyObject *queueobj,
_PyCrossInterpreterData *data)
{
PyObject *qidobj = PyObject_GetAttrString(queueobj, "_id");
if (qidobj == NULL) {
return -1;
}
struct idarg_int64_converter_data converted = {
.label = "queue ID",
};
int res = idarg_int64_converter(qidobj, &converted);
Py_CLEAR(qidobj);
if (!res) {
assert(PyErr_Occurred());
return -1;
}
void *raw = _queueid_xid_new(converted.id);
if (raw == NULL) {
return -1;
}
_PyCrossInterpreterData_Init(data, tstate->interp, raw, NULL,
_queueobj_from_xid);
_PyCrossInterpreterData_SET_FREE(data, _queueid_xid_free);
return 0;
}
/* module level code ********************************************************/
/* globals is the process-global state for the module. It holds all
the data that we need to share between interpreters, so it cannot
hold PyObject values. */
static struct globals {
int module_count;
_queues queues;
} _globals = {0};
static int
_globals_init(void)
{
// XXX This isn't thread-safe.
_globals.module_count++;
if (_globals.module_count > 1) {
// Already initialized.
return 0;
}
assert(_globals.queues.mutex == NULL);
PyThread_type_lock mutex = PyThread_allocate_lock();
if (mutex == NULL) {
return ERR_QUEUES_ALLOC;
}
_queues_init(&_globals.queues, mutex);
return 0;
}
static void
_globals_fini(void)
{
// XXX This isn't thread-safe.
_globals.module_count--;
if (_globals.module_count > 0) {
return;
}
_queues_fini(&_globals.queues);
}
static _queues *
_get_global_queues(void)
{
return &_globals.queues;
}
static void
clear_interpreter(void *data)
{
if (_globals.module_count == 0) {
return;
}
PyInterpreterState *interp = (PyInterpreterState *)data;
assert(interp == _get_current_interp());
int64_t interpid = PyInterpreterState_GetID(interp);
_queues_clear_interpreter(&_globals.queues, interpid);
}
typedef struct idarg_int64_converter_data qidarg_converter_data;
static int
qidarg_converter(PyObject *arg, void *ptr)
{
qidarg_converter_data *data = ptr;
if (data->label == NULL) {
data->label = "queue ID";
}
return idarg_int64_converter(arg, ptr);
}
static PyObject *
queuesmod_create(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"maxsize", "fmt", NULL};
Py_ssize_t maxsize;
int fmt;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "ni:create", kwlist,
&maxsize, &fmt)) {
return NULL;
}
int64_t qid = queue_create(&_globals.queues, maxsize, fmt);
if (qid < 0) {
(void)handle_queue_error((int)qid, self, qid);
return NULL;
}
PyObject *qidobj = PyLong_FromLongLong(qid);
if (qidobj == NULL) {
PyObject *exc = PyErr_GetRaisedException();
int err = queue_destroy(&_globals.queues, qid);
if (handle_queue_error(err, self, qid)) {
// XXX issue a warning?
PyErr_Clear();
}
PyErr_SetRaisedException(exc);
return NULL;
}
return qidobj;
}
PyDoc_STRVAR(queuesmod_create_doc,
"create(maxsize, fmt) -> qid\n\
\n\
Create a new cross-interpreter queue and return its unique generated ID.\n\
It is a new reference as though bind() had been called on the queue.\n\
\n\
The caller is responsible for calling destroy() for the new queue\n\
before the runtime is finalized.");
static PyObject *
queuesmod_destroy(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&:destroy", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
int err = queue_destroy(&_globals.queues, qid);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(queuesmod_destroy_doc,
"destroy(qid)\n\
\n\
Clear and destroy the queue. Afterward attempts to use the queue\n\
will behave as though it never existed.");
static PyObject *
queuesmod_list_all(PyObject *self, PyObject *Py_UNUSED(ignored))
{
int64_t count = 0;
struct queue_id_and_fmt *qids = _queues_list_all(&_globals.queues, &count);
if (qids == NULL) {
if (count == 0) {
return PyList_New(0);
}
return NULL;
}
PyObject *ids = PyList_New((Py_ssize_t)count);
if (ids == NULL) {
goto finally;
}
struct queue_id_and_fmt *cur = qids;
for (int64_t i=0; i < count; cur++, i++) {
PyObject *item = Py_BuildValue("Li", cur->id, cur->fmt);
if (item == NULL) {
Py_SETREF(ids, NULL);
break;
}
PyList_SET_ITEM(ids, (Py_ssize_t)i, item);
}
finally:
PyMem_Free(qids);
return ids;
}
PyDoc_STRVAR(queuesmod_list_all_doc,
"list_all() -> [(qid, fmt)]\n\
\n\
Return the list of IDs for all queues.\n\
Each corresponding default format is also included.");
static PyObject *
queuesmod_put(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", "obj", "fmt", NULL};
qidarg_converter_data qidarg;
PyObject *obj;
int fmt;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&Oi:put", kwlist,
qidarg_converter, &qidarg, &obj, &fmt)) {
return NULL;
}
int64_t qid = qidarg.id;
/* Queue up the object. */
int err = queue_put(&_globals.queues, qid, obj, fmt);
// This is the only place that raises QueueFull.
if (handle_queue_error(err, self, qid)) {
return NULL;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(queuesmod_put_doc,
"put(qid, obj, fmt)\n\
\n\
Add the object's data to the queue.");
static PyObject *
queuesmod_get(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&:get", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
PyObject *obj = NULL;
int fmt = 0;
int err = queue_get(&_globals.queues, qid, &obj, &fmt);
// This is the only place that raises QueueEmpty.
if (handle_queue_error(err, self, qid)) {
return NULL;
}
PyObject *res = Py_BuildValue("Oi", obj, fmt);
Py_DECREF(obj);
return res;
}
PyDoc_STRVAR(queuesmod_get_doc,
"get(qid) -> (obj, fmt)\n\
\n\
Return a new object from the data at the front of the queue.\n\
The object's format is also returned.\n\
\n\
If there is nothing to receive then raise QueueEmpty.");
static PyObject *
queuesmod_bind(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&:bind", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
// XXX Check module state if bound already.
int err = _queues_incref(&_globals.queues, qid);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
// XXX Update module state.
Py_RETURN_NONE;
}
PyDoc_STRVAR(queuesmod_bind_doc,
"bind(qid)\n\
\n\
Take a reference to the identified queue.\n\
The queue is not destroyed until there are no references left.");
static PyObject *
queuesmod_release(PyObject *self, PyObject *args, PyObject *kwds)
{
// Note that only the current interpreter is affected.
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O&:release", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
// XXX Check module state if bound already.
// XXX Update module state.
int err = _queues_decref(&_globals.queues, qid);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(queuesmod_release_doc,
"release(qid)\n\
\n\
Release a reference to the queue.\n\
The queue is destroyed once there are no references left.");
static PyObject *
queuesmod_get_maxsize(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O&:get_maxsize", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
Py_ssize_t maxsize = -1;
int err = queue_get_maxsize(&_globals.queues, qid, &maxsize);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
return PyLong_FromLongLong(maxsize);
}
PyDoc_STRVAR(queuesmod_get_maxsize_doc,
"get_maxsize(qid)\n\
\n\
Return the maximum number of items in the queue.");
static PyObject *
queuesmod_get_queue_defaults(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O&:get_queue_defaults", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
_queue *queue = NULL;
int err = _queues_lookup(&_globals.queues, qid, &queue);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
int fmt = queue->fmt;
_queue_unmark_waiter(queue, _globals.queues.mutex);
PyObject *fmt_obj = PyLong_FromLong(fmt);
if (fmt_obj == NULL) {
return NULL;
}
// For now queues only have one default.
PyObject *res = PyTuple_Pack(1, fmt_obj);
Py_DECREF(fmt_obj);
return res;
}
PyDoc_STRVAR(queuesmod_get_queue_defaults_doc,
"get_queue_defaults(qid)\n\
\n\
Return the queue's default values, set when it was created.");
static PyObject *
queuesmod_is_full(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O&:is_full", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
int is_full = 0;
int err = queue_is_full(&_globals.queues, qid, &is_full);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
if (is_full) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
PyDoc_STRVAR(queuesmod_is_full_doc,
"is_full(qid)\n\
\n\
Return true if the queue has a maxsize and has reached it.");
static PyObject *
queuesmod_get_count(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"qid", NULL};
qidarg_converter_data qidarg;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"O&:get_count", kwlist,
qidarg_converter, &qidarg)) {
return NULL;
}
int64_t qid = qidarg.id;
Py_ssize_t count = -1;
int err = queue_get_count(&_globals.queues, qid, &count);
if (handle_queue_error(err, self, qid)) {
return NULL;
}
assert(count >= 0);
return PyLong_FromSsize_t(count);
}
PyDoc_STRVAR(queuesmod_get_count_doc,
"get_count(qid)\n\
\n\
Return the number of items in the queue.");
static PyObject *
queuesmod__register_heap_types(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"queuetype", "emptyerror", "fullerror", NULL};
PyObject *queuetype;
PyObject *emptyerror;
PyObject *fullerror;
if (!PyArg_ParseTupleAndKeywords(args, kwds,
"OOO:_register_heap_types", kwlist,
&queuetype, &emptyerror, &fullerror)) {
return NULL;
}
if (!PyType_Check(queuetype)) {
PyErr_SetString(PyExc_TypeError,
"expected a type for 'queuetype'");
return NULL;
}
if (!PyExceptionClass_Check(emptyerror)) {
PyErr_SetString(PyExc_TypeError,
"expected an exception type for 'emptyerror'");
return NULL;
}
if (!PyExceptionClass_Check(fullerror)) {
PyErr_SetString(PyExc_TypeError,
"expected an exception type for 'fullerror'");
return NULL;
}
module_state *state = get_module_state(self);
if (set_external_queue_type(state, (PyTypeObject *)queuetype) < 0) {
return NULL;
}
if (set_external_exc_types(state, emptyerror, fullerror) < 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef module_functions[] = {
{"create", _PyCFunction_CAST(queuesmod_create),
METH_VARARGS | METH_KEYWORDS, queuesmod_create_doc},
{"destroy", _PyCFunction_CAST(queuesmod_destroy),
METH_VARARGS | METH_KEYWORDS, queuesmod_destroy_doc},
{"list_all", queuesmod_list_all,
METH_NOARGS, queuesmod_list_all_doc},
{"put", _PyCFunction_CAST(queuesmod_put),
METH_VARARGS | METH_KEYWORDS, queuesmod_put_doc},
{"get", _PyCFunction_CAST(queuesmod_get),
METH_VARARGS | METH_KEYWORDS, queuesmod_get_doc},
{"bind", _PyCFunction_CAST(queuesmod_bind),
METH_VARARGS | METH_KEYWORDS, queuesmod_bind_doc},
{"release", _PyCFunction_CAST(queuesmod_release),
METH_VARARGS | METH_KEYWORDS, queuesmod_release_doc},
{"get_maxsize", _PyCFunction_CAST(queuesmod_get_maxsize),
METH_VARARGS | METH_KEYWORDS, queuesmod_get_maxsize_doc},
{"get_queue_defaults", _PyCFunction_CAST(queuesmod_get_queue_defaults),
METH_VARARGS | METH_KEYWORDS, queuesmod_get_queue_defaults_doc},
{"is_full", _PyCFunction_CAST(queuesmod_is_full),
METH_VARARGS | METH_KEYWORDS, queuesmod_is_full_doc},
{"get_count", _PyCFunction_CAST(queuesmod_get_count),
METH_VARARGS | METH_KEYWORDS, queuesmod_get_count_doc},
{"_register_heap_types", _PyCFunction_CAST(queuesmod__register_heap_types),
METH_VARARGS | METH_KEYWORDS, NULL},
{NULL, NULL} /* sentinel */
};
/* initialization function */
PyDoc_STRVAR(module_doc,
"This module provides primitive operations to manage Python interpreters.\n\
The 'interpreters' module provides a more convenient interface.");
static int
module_exec(PyObject *mod)
{
if (_globals_init() != 0) {
return -1;
}
/* Add exception types */
if (add_QueueError(mod) < 0) {
goto error;
}
/* Make sure queues drop objects owned by this interpreter. */
PyInterpreterState *interp = _get_current_interp();
PyUnstable_AtExit(interp, clear_interpreter, (void *)interp);
return 0;
error:
_globals_fini();
return -1;
}
static struct PyModuleDef_Slot module_slots[] = {
{Py_mod_exec, module_exec},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{0, NULL},
};
static int
module_traverse(PyObject *mod, visitproc visit, void *arg)
{
module_state *state = get_module_state(mod);
traverse_module_state(state, visit, arg);
return 0;
}
static int
module_clear(PyObject *mod)
{
module_state *state = get_module_state(mod);
// Now we clear the module state.
clear_module_state(state);
return 0;
}
static void
module_free(void *mod)
{
module_state *state = get_module_state(mod);
// Now we clear the module state.
clear_module_state(state);
_globals_fini();
}
static struct PyModuleDef moduledef = {
.m_base = PyModuleDef_HEAD_INIT,
.m_name = MODULE_NAME_STR,
.m_doc = module_doc,
.m_size = sizeof(module_state),
.m_methods = module_functions,
.m_slots = module_slots,
.m_traverse = module_traverse,
.m_clear = module_clear,
.m_free = (freefunc)module_free,
};
PyMODINIT_FUNC
MODINIT_FUNC_NAME(void)
{
return PyModuleDef_Init(&moduledef);
}
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