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gh-140544: Always assume that thread locals are available (GH-140690)

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Python has required thread local support since 3.12 (see GH-103324). By assuming that thread locals are always supported, we can improve the performance of third-party extensions by allowing them to access the attached thread and interpreter states directly.
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Peter Bierma 2025-10-28 09:07:19 -04:00 • committed by GitHub
parent 88ad41fa34
commit 2cefa70eb9
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3 changed files with 12 additions and 34 deletions
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14
Python/import.c
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@ -782,18 +782,13 @@ _PyImport_ClearModulesByIndex(PyInterpreterState *interp)
substitute this (if the name actually matches).
*/
#ifdef HAVE_THREAD_LOCAL
_Py_thread_local const char *pkgcontext = NULL;
# undef PKGCONTEXT
# define PKGCONTEXT pkgcontext
#endif
const char *
_PyImport_ResolveNameWithPackageContext(const char *name)
{
#ifndef HAVE_THREAD_LOCAL
PyMutex_Lock(&EXTENSIONS.mutex);
#endif
if (PKGCONTEXT != NULL) {
const char *p = strrchr(PKGCONTEXT, '.');
if (p != NULL && strcmp(name, p+1) == 0) {
@ -801,23 +796,14 @@ _PyImport_ResolveNameWithPackageContext(const char *name)
PKGCONTEXT = NULL;
}
}
#ifndef HAVE_THREAD_LOCAL
PyMutex_Unlock(&EXTENSIONS.mutex);
#endif
return name;
}
const char *
_PyImport_SwapPackageContext(const char *newcontext)
{
#ifndef HAVE_THREAD_LOCAL
PyMutex_Lock(&EXTENSIONS.mutex);
#endif
const char *oldcontext = PKGCONTEXT;
PKGCONTEXT = newcontext;
#ifndef HAVE_THREAD_LOCAL
PyMutex_Unlock(&EXTENSIONS.mutex);
#endif
return oldcontext;
}