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gh-112175: Add eval_breaker to PyThreadState (#115194)

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This change adds an `eval_breaker` field to `PyThreadState`. The primary
motivation is for performance in free-threaded builds: with thread-local eval
breakers, we can stop a specific thread (e.g., for an async exception) without
interrupting other threads.

The source of truth for the global instrumentation version is stored in the
`instrumentation_version` field in PyInterpreterState. Threads usually read the
version from their local `eval_breaker`, where it continues to be colocated
with the eval breaker bits.
This commit is contained in:
Brett Simmers 2024-02-20 06:57:48 -08:00 • committed by GitHub
parent e71468ba4f
commit 0749244d13
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19 changed files with 265 additions and 172 deletions
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Python/executor_cases.c.h generated
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@ -17,7 +17,7 @@
if (_Py_emscripten_signal_clock == 0) goto deoptimize;
_Py_emscripten_signal_clock -= Py_EMSCRIPTEN_SIGNAL_HANDLING;
#endif
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->interp->ceval.eval_breaker);
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
uintptr_t version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
assert((version & _PY_EVAL_EVENTS_MASK) == 0);
if (eval_breaker != version) goto deoptimize;