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bpo-46771: Implement task cancel requests #31508

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bpo-46771: Implement task cancel requests #31508

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16 changes: 7 additions & 9 deletions Lib/asyncio/tasks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,7 @@ def __init__(self, coro, *, loop=None, name=None):
else:
self._name = str(name)

self._cancel_requested = False
self._num_cancels_requested = 0
self._must_cancel = False
self._fut_waiter = None
self._coro = coro
Expand Down Expand Up @@ -202,9 +202,9 @@ def cancel(self, msg=None):
self._log_traceback = False
if self.done():
return False
if self._cancel_requested:
self._num_cancels_requested += 1
if self._num_cancels_requested > 1:
return False
self._cancel_requested = True
if self._fut_waiter is not None:
if self._fut_waiter.cancel(msg=msg):
# Leave self._fut_waiter; it may be a Task that
Expand All @@ -217,14 +217,12 @@ def cancel(self, msg=None):
return True

def cancelling(self):
return self._cancel_requested
return self._num_cancels_requested

def uncancel(self):
if self._cancel_requested:
self._cancel_requested = False
return True
else:
return False
if self._num_cancels_requested > 0:
self._num_cancels_requested -= 1
return self._num_cancels_requested

def __step(self, exc=None):
if self.done():
Expand Down
24 changes: 8 additions & 16 deletions Modules/_asynciomodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,7 @@ typedef struct {
PyObject *task_context;
int task_must_cancel;
int task_log_destroy_pending;
int task_cancel_requested;
int task_num_cancels_requested;
} TaskObj;

typedef struct {
Expand Down Expand Up @@ -2040,7 +2040,7 @@ _asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop,
Py_CLEAR(self->task_fut_waiter);
self->task_must_cancel = 0;
self->task_log_destroy_pending = 1;
self->task_cancel_requested = 0;
self->task_num_cancels_requested = 0;
Py_INCREF(coro);
Py_XSETREF(self->task_coro, coro);

Expand Down Expand Up @@ -2207,10 +2207,10 @@ _asyncio_Task_cancel_impl(TaskObj *self, PyObject *msg)
Py_RETURN_FALSE;
}

if (self->task_cancel_requested) {
self->task_num_cancels_requested += 1;
if (self->task_num_cancels_requested > 1) {
Py_RETURN_FALSE;
}
self->task_cancel_requested = 1;

if (self->task_fut_waiter) {
PyObject *res;
Expand Down Expand Up @@ -2256,12 +2256,7 @@ _asyncio_Task_cancelling_impl(TaskObj *self)
/*[clinic end generated code: output=803b3af96f917d7e input=c50e50f9c3ca4676]*/
/*[clinic end generated code]*/
{
if (self->task_cancel_requested) {
Py_RETURN_TRUE;
}
else {
Py_RETURN_FALSE;
}
return PyLong_FromLong(self->task_num_cancels_requested);
}

/*[clinic input]
Expand All @@ -2280,13 +2275,10 @@ _asyncio_Task_uncancel_impl(TaskObj *self)
/*[clinic end generated code: output=58184d236a817d3c input=5db95e28fcb6f7cd]*/
/*[clinic end generated code]*/
{
if (self->task_cancel_requested) {
self->task_cancel_requested = 0;
Py_RETURN_TRUE;
}
else {
Py_RETURN_FALSE;
if (self->task_num_cancels_requested > 0) {
self->task_num_cancels_requested -= 1;
}
return PyLong_FromLong(self->task_num_cancels_requested);
}

/*[clinic input]
Expand Down