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Add support for PEP 567 context variables to tasklets #239
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sun., 18. apr. 2021 kl. 20:02 skrifaði Anselm Kruis <
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… Python 3.7 added the context variables and the module *contextvars*. See PEP
567 <https://www.python.org/dev/peps/pep-0567> for details.
Using tasklets it is possible to decorate a plain old callable as a
coroutine (and vice versa). To make such a coroutine fully compatible with
C-Python asyncio tasklets should support PEP 567 context variables. In
C-Python the *current context* is a property of the thread state, that
is, each thread has its own *current context*. In Stackless Python a
thread can have multiple tasklets. Therefore the *current context* must
become a property of the tasklet.
I'm still elaborating details.
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akruis
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May 18, 2021
Use a Py_LOCAL_INLINE function instead of a complicated macro. It is much simpler to debug. In the next commit, we will context switching to this function.
akruis
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May 18, 2021
Add a private context attribute and appropriate methods to class tasklet. Document the changes in the manual. New methods: tasklet.set_context(context), tasklet.context_run(...) New readonly attribute: tasklet.context_id Add/improve pickling of the context of tasklets. New pickle flag "PICKLEFLAGS_PICKLE_CONTEXT", new undocumented function stackless._tasklet_get_unpicklable_state()
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Implemented in 3.7-slp |
akruis
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Jun 5, 2021
Use a Py_LOCAL_INLINE function instead of a complicated macro. It is much simpler to debug. In the next commit, we will context switching to this function. (cherry picked from commit a11414b)
akruis
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Jun 5, 2021
Add a private context attribute and appropriate methods to class tasklet. Document the changes in the manual. New methods: tasklet.set_context(context), tasklet.context_run(...) New readonly attribute: tasklet.context_id Add/improve pickling of the context of tasklets. New pickle flag "PICKLEFLAGS_PICKLE_CONTEXT", new undocumented function stackless._tasklet_get_unpicklable_state() (cherry picked from commit 032a566)
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Merged into main-slp. |
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Python 3.7 added the context variables and the module contextvars. See PEP 567 for details.
Using tasklets it is possible to decorate a plain old callable as a coroutine (and vice versa). To make such a coroutine fully compatible with C-Python asyncio tasklets should support PEP 567 context variables. In C-Python the current context is a property of the thread state, that is, each thread has its own current context. In Stackless Python a thread can have multiple tasklets. Therefore the current context must become a property of the tasklet.
I'm still elaborating details.
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