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18ef0f0cb5 [3.14] gh-152075: Avoid lock contention in _Py_Specialize_LoadGlobal under free threading (gh-153720) (#158904 )

gh-152075: Avoid lock contention in _Py_Specialize_LoadGlobal under free threading (gh-153720)

Under high thread concurrency in free-threaded builds, `_Py_Specialize_LoadGlobal` suffers from lock contention when acquiring the critical section mutexes for the `globals` and `builtins` dictionaries during bytecode specialization.

This PR skips LOAD_GLOBAL bytecode specialization if acquiring the two object mutexes would block.
(cherry picked from commit ac8ba0ca5a)

Co-authored-by: Peter Hawkins <[email protected]>

2026-10-06 18:47:51 +05:30

clinic

[3.14] gh-155952: Fix <unrepresentable> Argument Clinic defaults in several signatures (#156172 )

2026-08-21 13:23:30 +01:00

frozen_modules

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_contextvars.c

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_warnings.c

[3.14] gh-155952: Fix <unrepresentable> Argument Clinic defaults in several signatures (#156172 )

2026-08-21 13:23:30 +01:00

asdl.c

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asm_trampoline_aarch64.h

[3.14] gh-139808: Add branch protections for aarch64 in asm_trampoline.S (#130864 ) (#150189 )

2026-05-21 18:41:26 +02:00

asm_trampoline.S

[3.14] gh-139808: Add branch protections for aarch64 in asm_trampoline.S (#130864 ) (#150189 )

2026-05-21 18:41:26 +02:00

assemble.c

[3.14] gh-151112: Fix double free in assemble_init when out of memory (GH-151142) (#151206 )

2026-06-09 21:13:45 +01:00

ast_preprocess.c

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ast_unparse.c

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ast.c

[3.14] gh-85260: Extend the AST Validator to validate all identifiers (GH-21069) (GH-155651)

2026-08-13 05:58:06 +00:00

bltinmodule.c

[3.14] gh-150285: Fix too long docstrings in builtins (GH-150293) (GH-150466)

2026-05-26 10:05:49 +00:00

bootstrap_hash.c

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brc.c

[3.14] gh-157838: Merge biased refcounts on behalf of detached threads (#157839 ) (#158012 )

2026-09-29 08:22:24 +05:30

bytecodes.c

[3.14] gh-154902: Type-check the SET_ADD operand (#155072 )

2026-08-05 07:24:50 -07:00

ceval_gil.c

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ceval_macros.h

[3.14] gh-129752: Don't update adaptive counters when TLBC=0 in free-threading. (gh-155497) (gh-155715)

2026-08-13 15:20:04 +00:00

ceval.c

[3.14] gh-153205: Set MemoryError in stackref array conversion (GH-153206) (#153273 )

2026-07-07 16:32:27 +00:00

codecs.c

[3.14][3.15] gh-151253: Dump the Python path configuration on _PyCodec_InitRegistry() failure (#151250 ) (#151269 ) (#151283 )

2026-06-10 20:31:29 +00:00

codegen.c

[3.14] gh-156091: Fix crash compiling deeply nested inlined comprehensions (GH-156957) (#156993 )

2026-09-05 16:27:05 +00:00

compile.c

[3.14] gh-156466: Fix additional compiler scope cleanup errors (GH-156547) (#156572 )

2026-08-29 12:42:26 +00:00

condvar.h

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config_common.h

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context.c

[3.14] gh-155519: fix data-race for Context.ctx_vars (GH-155522) (#155892 )

2026-08-20 15:21:09 +05:30

critical_section.c

[3.14] gh-150902: Optimize PyCriticalSection2 to skip locking the same locks held by the current CS2 (gh-151555)

2026-06-19 09:51:55 -04:00

crossinterp_data_lookup.h

[3.14] gh-146615: Fix format specifiers in Python/ directory (GH-146619) (GH-146650)

2026-03-31 08:25:07 +00:00

crossinterp_exceptions.h

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crossinterp.c

[3.14] gh-151842: Fix crash upon OOM in _interpreters.capture_exception (GH-151843) (GH-152032)

2026-06-23 20:57:34 +00:00

dtoa.c

[3.14] gh-158446: Reject float format precision near INT_MAX (GH-158474) (#158477 )

2026-09-30 08:36:53 +00:00

dup2.c

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dynamic_annotations.c

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dynload_hpux.c

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dynload_shlib.c

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dynload_stub.c

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dynload_win.c

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emscripten_signal.c

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emscripten_syscalls.c

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emscripten_trampoline_inner.c

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emscripten_trampoline.c

[3.14] gh-145037: Fix Emscripten trampoline with emcc >= 4.0.19 (GH-145038) (#145283 )

2026-02-27 08:55:59 +08:00

errors.c

[3.14] gh-156204: Guard recursion in PyErr_GivenExceptionMatches (GH-156205) (GH-158623)

2026-10-02 20:50:00 +00:00

executor_cases.c.h

[3.14] gh-154902: Type-check the SET_ADD operand (#155072 )

2026-08-05 07:24:50 -07:00

fileutils.c

[3.14] gh-87587: Fix os.device_encoding() for any console on Windows (GH-155410) (GH-156596)

2026-08-29 18:50:41 +00:00

flowgraph.c

[3.14] gh-148817: Fold long lists/sets of constant elements into constant tu… (#155898 )

2026-08-16 17:16:24 +03:00

formatter_unicode.c

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frame.c

[3.14] gh-144446: Fix some frame object thread-safety issues (gh-144479) (#144546 )

2026-02-06 15:25:36 +00:00

frozen.c

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frozenmain.c

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future.c

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gc_free_threading.c

[3.14] gh-156395: Report frozen objects on free-threaded GC build (GH-156396) (#156421 )

2026-08-28 09:51:31 -07:00

gc_gil.c

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gc.c

[3.14] GH-148726: Add heap_size to _gc_runtime_state (#149025 )

2026-04-29 13:04:11 +03:00

generated_cases.c.h

[3.14] gh-154902: Type-check the SET_ADD operand (#155072 )

2026-08-05 07:24:50 -07:00

getargs.c

[3.14] gh-146615: Fix format specifiers in Python/ directory (GH-146619) (GH-146650)

2026-03-31 08:25:07 +00:00

getcompiler.c

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getcopyright.c

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getopt.c

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getplatform.c

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getversion.c

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hamt.c

[3.14] gh-155515: Use GC tracking for HAMT iterators (GH-155517) (#155698 )

2026-08-17 06:40:05 +03:00

hashtable.c

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import.c

[3.14] gh-156126: Fix crash in -X importtime with unencodable module … (#156330 )

2026-08-25 00:11:08 +03:00

importdl.c

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index_pool.c

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initconfig.c

[3.14] gh-86427: Use the console code page for the stdio encoding on Windows (GH-155415) (GH-156603)

2026-08-29 19:45:46 +00:00

instruction_sequence.c

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instrumentation.c

[3.14] Add MSan to CI (GH-158625) (#158834 )

2026-10-05 10:24:22 +00:00

interpconfig.c

[3.14] gh-146615: Fix format specifiers in Python/ directory (GH-146619) (GH-146650)

2026-03-31 08:25:07 +00:00

intrinsics.c

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jit.c

[3.14] GH-146128: Remove the buggy AArch64 "33rx" relocation (GH-146263) (#148198 )

2026-04-07 14:05:47 +03:00

legacy_tracing.c

[3.14] gh-148037: remove critical section from PyCode_Addr2Line (GH… (#148353 )

2026-04-10 23:59:38 +05:30

lock.c

[3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852) (#148884 )

2026-04-22 18:59:58 +00:00

marshal.c

[3.14] gh-128509: Use bytes singletons in marshal (GH-157398) (#157432 )

2026-09-13 14:45:28 +00:00

modsupport.c

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mysnprintf.c

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mystrtoul.c

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object_stack.c

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opcode_targets.h

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optimizer_analysis.c

[3.14] gh-145235: Make dict watcher API thread-safe for free-threaded builds (gh-145233) (#149691 )

2026-05-12 13:21:31 -04:00

optimizer_bytecodes.c

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optimizer_cases.c.h

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optimizer_symbols.c

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optimizer.c

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parking_lot.c

[3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852) (#148884 )

2026-04-22 18:59:58 +00:00

pathconfig.c

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perf_jit_trampoline.c

[3.14] gh-156114: Fix crash in perf trampoline with unencodable code names (GH-156300) (#157775 )

2026-09-18 21:35:08 +00:00

perf_trampoline.c

[3.14] gh-156114: Fix crash in perf trampoline with unencodable code names (GH-156300) (#157775 )

2026-09-18 21:35:08 +00:00

preconfig.c

[3.14] gh-145092: Fix compiler warning for memchr() and wcschr() returning const pointer (GH-145093) (GH-145102)

2026-02-22 08:28:17 +00:00

pyarena.c

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pyctype.c

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pyfpe.c

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pyhash.c

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pylifecycle.c

[3.14] gh-151218: Replace sys.flags in PyConfig_Set() (#151402 ) (#151553 )

2026-06-16 18:55:35 +02:00

pymath.c

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pystate.c

[3.14] gh-158364: Don't report other interpreters' threads in sys._current_frames (GH-158369) (GH-158472)

2026-09-30 02:53:39 +00:00

pystrcmp.c

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pystrhex.c

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pystrtod.c

[3.14] gh-158446: Reject float format precision near INT_MAX (GH-158474) (#158477 )

2026-09-30 08:36:53 +00:00

Python-ast.c

[3.14] gh-156689: Fix out-of-bounds read in PyAst_CheckMode() for mode='func_type' (GH-156697) (#156704 )

2026-08-31 14:19:57 +01:00

Python-tokenize.c

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pythonrun.c

[3.14] gh-152132: Test Py_CompileString() in test_capi.test_run (#153470 ) (#153473 )

2026-07-10 02:08:14 +00:00

pytime.c

[3.14] gh-152849: Fix OverflowError message for out-of-range timestamps in the time module (GH-152850) (#153208 )

2026-07-06 15:16:34 +00:00

qsbr.c

[3.14] gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) (#144923 )

2026-03-31 19:20:24 +00:00

README

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remote_debug.h

[3.14] gh-154194: Degrade frames instead of failing the sample (GH-154195) (#158833 )

2026-10-05 10:04:44 +00:00

remote_debugging.c

[3.14] gh-149619: Harden _remote_debugging error paths (GH-150349) (#154844 )

2026-07-28 23:46:43 +01:00

specialize.c

[3.14] gh-152075: Avoid lock contention in _Py_Specialize_LoadGlobal under free threading (gh-153720) (#158904 )

2026-10-06 18:47:51 +05:30

stackrefs.c

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stdlib_module_names.h

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structmember.c

[3.14] gh-146270: Fix PyMember_SetOne(..., NULL) not being atomic (gh-148800) (#149460 )

2026-05-06 14:16:36 +00:00

suggestions.c

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symtable.c

[3.14] gh-156525: fix a few error path scope management bugs in symtable (GH-156526) (#156533 )

2026-08-28 19:56:34 -07:00

sysmodule.c

[3.14] gh-151218: Replace sys.flags in PyConfig_Set() (#151402 ) (#151553 )

2026-06-16 18:55:35 +02:00

thread_nt.h

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thread_pthread_stubs.h

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thread_pthread.h

[3.14] gh-154283: Make threading.get_native_id() unique across processes on DragonFly (GH-154287) (GH-154297)

2026-07-20 20:21:13 +00:00

thread.c

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tier2_engine.md

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traceback.c

[3.14] gh-113318: Fix @getter and @setter in Argument Clinic (GH-155778) (GH-156011)

2026-08-18 13:09:24 +00:00

tracemalloc.c

[3.14] gh-144763: Fix race conditions in tracemalloc (#144779 ) (#144965 )

2026-02-18 20:55:38 +01:00

uniqueid.c

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vm-state.md

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README

Miscellaneous source files for the main Python shared library