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gh-116818: Make sys.settrace, sys.setprofile, and monitoring thread-safe (#116775)

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Makes sys.settrace, sys.setprofile, and monitoring generally thread-safe.

Mostly uses a stop-the-world approach and synchronization around the code object's _co_instrumentation_version.  There may be a little bit of extra synchronization around the monitoring data that's required to be TSAN clean.
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Dino Viehland 2024-04-19 14:47:42 -07:00 • committed by GitHub
parent b45af00bad
commit 07525c9a85
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18 changed files with 530 additions and 63 deletions
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Python/executor_cases.c.h generated
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@ -21,7 +21,7 @@
_Py_emscripten_signal_clock -= Py_EMSCRIPTEN_SIGNAL_HANDLING;
#endif
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
uintptr_t version = _PyFrame_GetCode(frame)->_co_instrumentation_version;
uintptr_t version = FT_ATOMIC_LOAD_UINTPTR_ACQUIRE(_PyFrame_GetCode(frame)->_co_instrumentation_version);
assert((version & _PY_EVAL_EVENTS_MASK) == 0);
if (eval_breaker != version) {
UOP_STAT_INC(uopcode, miss);