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gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion #146303

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Merged
gpshead merged 10 commits into from
Apr 11, 2026
Merged

gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion #146303

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1eda370
gh-146302: make Py_IsInitialized() thread-safe and reflect true init …
gpshead Mar 22, 2026
efeae3b
Improve comment wording in pycore_runtime.h accessors
gpshead Mar 22, 2026
3e1eedd
PySys_AddAuditHook: check initialized, not core_initialized
gpshead Mar 22, 2026
59f51a2
Add regression test: Py_IsInitialized() must be false during site import
gpshead Mar 22, 2026
2e3aa7e
Remove unnecessary putenv("PYTHONMALLOC=") from test
gpshead Mar 22, 2026
ba28b37
Address review: use wrapper functions instead of low-level accessors
gpshead Mar 22, 2026
abae231
alphabetical includes, ack that other APIs are used in the comment
gpshead Mar 22, 2026
01df0a2
Address review: use seq-cst atomics for initialized flags
gpshead Mar 23, 2026
ee2d0be
_testembed.test_init_main assert not init per review
gpshead Apr 11, 2026
aec5131
Merge branch 'main' into gh-146302-py-isinitialized-thread-safe
gpshead Apr 11, 2026
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Improve comment wording in pycore_runtime.h accessors 
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
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@gpshead @claude
gpshead and claude committed Mar 22, 2026
commit efeae3ba35556f36a6e58497b53ffdf5052e23a6
4 changes: 2 additions & 2 deletions Include/internal/pycore_runtime.h
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Expand Up @@ -56,8 +56,8 @@ _PyRuntimeState_SetFinalizing(_PyRuntimeState *runtime, PyThreadState *tstate) {
}
}

// Use acquire/release (not relaxed) because these are publication flags:
// when a reader sees 1, all prior initialization writes must be visible.
// Release on store, acquire on load: a thread that reads initialized=1
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// is guaranteed to observe all writes from the initialization sequence.

static inline int
_PyRuntimeState_GetCoreInitialized(_PyRuntimeState *runtime) {
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