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...PyThreadState. forget the ThreadState as being owned by the thread. return It is assumed that it is an error if two discrete PyThreadStates are used for a single thread. Comments in pystate.h ("State unique per thread") support this view, although it is never directly stated. Thus, this will require some implementation of Thread Local Storage. Fortunately, a platform independent implementation of Thread Local Storage already exists in the Python source tree, in the SGI threading port. Thi...
...PyThreadState = PyThreadState_Get() return ts.context.copy() contextvars.ContextVar interacts with PyThreadState.context directly: class ContextVar: def __init__(self, name, *, default=_NO_DEFAULT): self._name = name self._default = default @property def name(self): return self._name def get(self, default=_NO_DEFAULT): ts: PyThreadState = PyThreadState_Get() try: return ts.context[self] except KeyError: ...
...PyThreadState: bpo-39947 Python 3.9 adds 3 getter functions: PyThreadState_GetFrame(), PyThreadState_GetID(), PyThreadState_GetInterpreter(). Disallow using Py_TYPE() as l-value The Py_TYPE() function gets an object type, its PyObject.ob_type member. It is implemented as a macro which can be used as an l-value to set the type: Py_TYPE(obj) = new_type. This code relies on the assumption that PyObject.ob_type can be modified directly. It prevents making the PyObject structure opaque. New sett...
...PyThreadState_Get().ec Let's review all possible context modification scenarios: The ContextVariable.set() method is called: def ContextVar_set(self, val): # See a more complete set() definition # in the `Context Variables` section. tstate = PyThreadState_Get() top_ec_node = tstate.ec top_lc = top_ec_node.lc new_top_lc = top_lc.set(self, val) tstate.ec = ec_node( prev=top_ec_node.prev, lc=new_top_lc) The contextvars.run_with_logical_context() is ...
...PyThreadState PyInterpreterState struct _frame struct symtable struct _node PyWeakReference PyLongObject PyTypeObject Type Objects The structure of type objects is not available to applications; declaration of "static" type objects is not possible anymore (for applications using this ABI). Instead, type objects get created dynamically. To allow an easy creation of types (in particular, to be able to fill out function pointers easily), the following structures and functions are available: typ...
...PyThreadState → Context → Context → ...), with the "top" of the stack at the beginning of the list to allow efficient push/pop. A critical optimization in PEP 567 is the caching of values inside ContextVar. Switching from a single context to a context stack makes this a little bit more complicated, but not too much. Currently, we invalidate the cache whenever the threadstate's current Context changes (on thread switch, and when entering/exiting Context.run). The simplest approach here would be t...
...PyThreadState *owner; /* whichever thread is currently collecting (NULL if no collection is taking place) */ } gc_mutex; An internal structure gc_thread is added to handle synchronization with the GC thread: static struct { PyThread_type_lock wakeup; /* acts as an event to wake up the GC thread */ int collection_requested; /* non-zero if collection requested */ PyThread_type_lock done; /* acts as an event signaling ...
...PyThreadState *tstate = PyThreadState_GET(); return tstate->interp->eval_frame(frame, throwflag); } This allows third-party code to place themselves directly in the path of Python code execution while being backwards-compatible with code already using the pre-existing C API. Updating python-gdb.py The generated python-gdb.py file used for Python support in GDB makes some hard-coded assumptions about PyEval_EvalFrameEx(), e.g. the names of local variables. It will need to be updated ...
...PyThreadState structure. Inspect Module Enhancements Two new functions are proposed for the inspect module: isframeincleanup() and getcleanupframe(). isframeincleanup(), given a frame or generator object as its sole argument, returns the value of the f_in_cleanup attribute of a frame itself or of the gi_frame attribute of a generator. getcleanupframe(), given a frame object as its sole argument, returns the innermost frame which has a true value of f_in_cleanup, or None if no frames in the sta...
...PyThreadState) in the thread first. This means that the same thread may run more than one interpreter (though obviously not at the same time). The proposed module maintains this behavior. Subinterpreters are not tied to threads. Only calls to Interpreter.run() are. However, one of the key objectives of this PEP is to provide a more human- centric concurrency model. With that in mind, from a conceptual standpoint the module might be easier to understand if each subinterpreter were associated...