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gh-112529: Implement GC for free-threaded builds (#114262)

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* gh-112529: Implement GC for free-threaded builds

This implements a mark and sweep GC for the free-threaded builds of
CPython. The implementation relies on mimalloc to find GC tracked
objects (i.e., "containers").
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Sam Gross 2024-01-25 13:27:36 -05:00 • committed by GitHub
parent 4850410b60
commit b52fc70d1a
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18 changed files with 1952 additions and 22 deletions
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4
Include/object.h
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@ -212,7 +212,9 @@ struct _object {
struct _PyMutex { uint8_t v; };
struct _object {
uintptr_t ob_tid; // thread id (or zero)
// ob_tid stores the thread id (or zero). It is also used by the GC to
// store linked lists and the computed "gc_refs" refcount.
uintptr_t ob_tid;
uint16_t _padding;
struct _PyMutex ob_mutex; // per-object lock
uint8_t ob_gc_bits; // gc-related state