51 lines
2.5 KiB
Cython
51 lines
2.5 KiB
Cython
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from .object cimport PyObject, PyTypeObject, Py_TYPE # legacy imports for re-export
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cdef extern from "Python.h":
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#####################################################################
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# 3. Reference Counts
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#####################################################################
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# The macros in this section are used for managing reference counts of Python objects.
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void Py_INCREF(object o)
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# Increment the reference count for object o. The object must not
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# be NULL; if you aren't sure that it isn't NULL, use
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# Py_XINCREF().
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void Py_XINCREF(PyObject* o)
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# Increment the reference count for object o. The object may be NULL, in which case the macro has no effect.
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void Py_DECREF(object o)
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# Decrement the reference count for object o. The object must not
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# be NULL; if you aren't sure that it isn't NULL, use
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# Py_XDECREF(). If the reference count reaches zero, the object's
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# type's deallocation function (which must not be NULL) is
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# invoked.
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# Warning: The deallocation function can cause arbitrary Python
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# code to be invoked (e.g. when a class instance with a __del__()
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# method is deallocated). While exceptions in such code are not
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# propagated, the executed code has free access to all Python
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# global variables. This means that any object that is reachable
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# from a global variable should be in a consistent state before
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# Py_DECREF() is invoked. For example, code to delete an object
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# from a list should copy a reference to the deleted object in a
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# temporary variable, update the list data structure, and then
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# call Py_DECREF() for the temporary variable.
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void Py_XDECREF(PyObject* o)
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# Decrement the reference count for object o. The object may be
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# NULL, in which case the macro has no effect; otherwise the
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# effect is the same as for Py_DECREF(), and the same warning
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# applies.
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void Py_CLEAR(PyObject* o)
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# Decrement the reference count for object o. The object may be
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# NULL, in which case the macro has no effect; otherwise the
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# effect is the same as for Py_DECREF(), except that the argument
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# is also set to NULL. The warning for Py_DECREF() does not apply
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# with respect to the object passed because the macro carefully
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# uses a temporary variable and sets the argument to NULL before
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# decrementing its reference count.
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# It is a good idea to use this macro whenever decrementing the
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# value of a variable that might be traversed during garbage
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# collection.
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