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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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Address review: use wrapper functions instead of low-level accessors 
Use _Py_IsCoreInitialized() in preconfig.c and Py_IsInitialized() in
Py_InitializeEx(), removing the unnecessary runtime local variable.

Thanks picnixz!
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@gpshead
gpshead committed Mar 22, 2026
commit ba28b37101149f95d2c49b713d7493f2ecb66836
2 changes: 1 addition & 1 deletion Python/preconfig.c
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Expand Up @@ -928,7 +928,7 @@ _PyPreConfig_Write(const PyPreConfig *src_config)
return status;
}

if (_PyRuntimeState_GetCoreInitialized(&_PyRuntime)) {
if (_Py_IsCoreInitialized()) {
/* bpo-34008: Calling this functions after Py_Initialize() ignores
the new configuration. */
return _PyStatus_OK();
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3 changes: 1 addition & 2 deletions Python/pylifecycle.c
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Expand Up @@ -1505,9 +1505,8 @@ Py_InitializeEx(int install_sigs)
if (_PyStatus_EXCEPTION(status)) {
Py_ExitStatusException(status);
}
_PyRuntimeState *runtime = &_PyRuntime;

if (_PyRuntimeState_GetInitialized(runtime)) {
if (Py_IsInitialized()) {
/* bpo-33932: Calling Py_Initialize() twice does nothing. */
return;
}
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