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gh-118527: Intern code consts in free-threaded build (#118667)

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We already intern and immortalize most string constants. In the
free-threaded build, other constants can be a source of reference count
contention because they are shared by all threads running the same code
objects.
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Sam Gross 2024-05-06 20:12:39 -04:00 • committed by GitHub
parent 8d8275b0cf
commit 723d4d2fe8
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14 changed files with 375 additions and 18 deletions
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10
Include/internal/pycore_code.h
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@ -8,6 +8,8 @@ extern "C" {
# error "this header requires Py_BUILD_CORE define"
#endif
#include "pycore_lock.h" // PyMutex
// We hide some of the newer PyCodeObject fields behind macros.
// This helps with backporting certain changes to 3.12.
@ -16,6 +18,14 @@ extern "C" {
#define _PyCode_HAS_INSTRUMENTATION(CODE) \
(CODE->_co_instrumentation_version > 0)
struct _py_code_state {
PyMutex mutex;
// Interned constants from code objects. Used by the free-threaded build.
struct _Py_hashtable_t *constants;
};
extern PyStatus _PyCode_Init(PyInterpreterState *interp);
extern void _PyCode_Fini(PyInterpreterState *interp);
#define CODE_MAX_WATCHERS 8