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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/pylifecycle.c
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@ -663,6 +663,7 @@ pycore_create_interpreter(_PyRuntimeState *runtime,
if (tstate == NULL) {
return _PyStatus_ERR("can't make first thread");
}
runtime->main_tstate = tstate;
_PyThreadState_Bind(tstate);
init_interp_create_gil(tstate, config.gil);