119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
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#ifndef GREENLET_THREAD_STATE_DICT_CLEANUP_HPP
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#define GREENLET_THREAD_STATE_DICT_CLEANUP_HPP
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#include "greenlet_internal.hpp"
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#include "greenlet_thread_state.hpp"
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#ifdef __clang__
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wmissing-field-initializers"
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#endif
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#ifndef G_THREAD_STATE_DICT_CLEANUP_TYPE
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// shut the compiler up if it looks at this file in isolation
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#define ThreadStateCreator int
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#endif
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// Define a Python object that goes in the Python thread state dict
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// when the greenlet thread state is created, and which owns the
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// reference to the greenlet thread local state.
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// When the thread state dict is cleaned up, so too is the thread
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// state. This works best if we make sure there are no circular
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// references to the thread state.
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typedef struct _PyGreenletCleanup {
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PyObject_HEAD
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ThreadStateCreator* thread_state_creator;
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} PyGreenletCleanup;
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static void
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cleanup_do_dealloc(PyGreenletCleanup* self)
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{
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ThreadStateCreator* tmp = self->thread_state_creator;
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self->thread_state_creator = nullptr;
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if (tmp) {
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delete tmp;
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}
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}
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static void
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cleanup_dealloc(PyGreenletCleanup* self)
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{
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PyObject_GC_UnTrack(self);
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cleanup_do_dealloc(self);
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}
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static int
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cleanup_clear(PyGreenletCleanup* self)
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{
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// This method is never called by our test cases.
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cleanup_do_dealloc(self);
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return 0;
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}
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static int
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cleanup_traverse(PyGreenletCleanup* self, visitproc visit, void* arg)
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{
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if (self->thread_state_creator) {
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return self->thread_state_creator->tp_traverse(visit, arg);
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}
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return 0;
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}
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static int
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cleanup_is_gc(PyGreenlet* UNUSED(self))
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{
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return 1;
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}
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static PyTypeObject PyGreenletCleanup_Type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"greenlet._greenlet.ThreadStateCleanup",
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sizeof(struct _PyGreenletCleanup),
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0, /* tp_itemsize */
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/* methods */
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(destructor)cleanup_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as _number*/
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0, /* tp_as _sequence*/
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0, /* tp_as _mapping*/
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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0, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer*/
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G_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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"Internal use only", /* tp_doc */
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(traverseproc)cleanup_traverse, /* tp_traverse */
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(inquiry)cleanup_clear, /* tp_clear */
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0, /* tp_richcompare */
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// XXX: Don't our flags promise a weakref?
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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PyType_GenericAlloc, /* tp_alloc */
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PyType_GenericNew, /* tp_new */
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PyObject_GC_Del, /* tp_free */
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(inquiry)cleanup_is_gc, /* tp_is_gc */
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};
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#ifdef __clang__
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# pragma clang diagnostic pop
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#endif
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#endif
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