gh-127065: Make methodcaller thread-safe and re-entrant (v2)#127746
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Co-authored-by: Sam Gross <colesbury@gmail.com>
Co-authored-by: Sam Gross <colesbury@gmail.com>
eendebakpt commented Dec 8, 2024
| Py_VISIT(mc->args); | ||
| Py_VISIT(mc->kwds); | ||
| Py_VISIT(mc->vectorcall_args); | ||
| Py_VISIT(mc->vectorcall_kwnames); |
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Note mc->vectorcall_kwnames is a tuple of strings, but the strings can be subclasses of str, so we need to visit this.
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Looks good. A few small comments below
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colesbury approved these changes Dec 9, 2024
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LGTM. Thanks for fixing this!
colesbury merged commit b0f278f into python:main 41 checks passed
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srinivasreddy pushed a commit to srinivasreddy/cpython that referenced this pull request Jan 8, 2025
…GH-127746) The function `operator.methodcaller` was not thread-safe since the additional of the vectorcall method in pythongh-89013. In the free threading build the issue is easy to trigger, for the normal build harder. This makes the `methodcaller` safe by: * Replacing the lazy initialization with initialization in the constructor. * Using a stack allocated space for the vectorcall arguments and falling back to `tp_call` for calls with more than 8 arguments.
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See #127245 for details.
methodcalleris not thread-safe (or re-entrant) #127065