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Name	Size	Permission	Date
mimalloc	[ DIR ]	drwxr-xr-x	2025-05-13 10:39
pycore_abstract.h	1.87 KB	-rw-r--r--	2025-04-08 13:54
pycore_asdl.h	2.96 KB	-rw-r--r--	2025-04-08 13:54
pycore_ast.h	30.78 KB	-rw-r--r--	2025-04-08 13:54
pycore_ast_state.h	6.62 KB	-rw-r--r--	2025-04-08 13:54
pycore_atexit.h	1.4 KB	-rw-r--r--	2025-04-08 13:54
pycore_backoff.h	3.81 KB	-rw-r--r--	2025-04-08 13:54
pycore_bitutils.h	5.88 KB	-rw-r--r--	2025-04-08 13:54
pycore_blocks_output_buffer.h	8.57 KB	-rw-r--r--	2025-04-08 13:54
pycore_brc.h	2.05 KB	-rw-r--r--	2025-04-08 13:54
pycore_bytes_methods.h	3.84 KB	-rw-r--r--	2025-04-08 13:54
pycore_bytesobject.h	4.75 KB	-rw-r--r--	2025-04-08 13:54
pycore_call.h	5.99 KB	-rw-r--r--	2025-04-08 13:54
pycore_capsule.h	397 B	-rw-r--r--	2025-04-08 13:54
pycore_cell.h	1.03 KB	-rw-r--r--	2025-04-08 13:54
pycore_ceval.h	10.9 KB	-rw-r--r--	2025-04-08 13:54
pycore_ceval_state.h	3.83 KB	-rw-r--r--	2025-04-08 13:54
pycore_code.h	19.4 KB	-rw-r--r--	2025-04-08 13:54
pycore_codecs.h	2.41 KB	-rw-r--r--	2025-04-08 13:54
pycore_compile.h	3.66 KB	-rw-r--r--	2025-04-08 13:54
pycore_complexobject.h	588 B	-rw-r--r--	2025-04-08 13:54
pycore_condvar.h	2.64 KB	-rw-r--r--	2025-04-08 13:54
pycore_context.h	1.15 KB	-rw-r--r--	2025-04-08 13:54
pycore_critical_section.h	7.78 KB	-rw-r--r--	2025-04-08 13:54
pycore_crossinterp.h	11.84 KB	-rw-r--r--	2025-04-08 13:54
pycore_descrobject.h	543 B	-rw-r--r--	2025-04-08 13:54
pycore_dict.h	11.98 KB	-rw-r--r--	2025-04-08 13:54
pycore_dict_state.h	732 B	-rw-r--r--	2025-04-08 13:54
pycore_dtoa.h	1.69 KB	-rw-r--r--	2025-04-08 13:54
pycore_emscripten_signal.h	685 B	-rw-r--r--	2025-04-08 13:54
pycore_emscripten_trampoline.h	3.11 KB	-rw-r--r--	2025-04-08 13:54
pycore_exceptions.h	900 B	-rw-r--r--	2025-04-08 13:54
pycore_faulthandler.h	2.19 KB	-rw-r--r--	2025-04-08 13:54
pycore_fileutils.h	9.25 KB	-rw-r--r--	2025-04-08 13:54
pycore_fileutils_windows.h	2.65 KB	-rw-r--r--	2025-04-08 13:54
pycore_floatobject.h	1.46 KB	-rw-r--r--	2025-04-08 13:54
pycore_flowgraph.h	1.45 KB	-rw-r--r--	2025-04-08 13:54
pycore_format.h	480 B	-rw-r--r--	2025-04-08 13:54
pycore_frame.h	10.62 KB	-rw-r--r--	2025-04-08 13:54
pycore_freelist.h	4.7 KB	-rw-r--r--	2025-04-08 13:54
pycore_function.h	1.5 KB	-rw-r--r--	2025-04-08 13:54
pycore_gc.h	12.66 KB	-rw-r--r--	2025-04-08 13:54
pycore_genobject.h	859 B	-rw-r--r--	2025-04-08 13:54
pycore_getopt.h	490 B	-rw-r--r--	2025-04-08 13:54
pycore_gil.h	2.14 KB	-rw-r--r--	2025-04-08 13:54
pycore_global_objects.h	3.02 KB	-rw-r--r--	2025-04-08 13:54
pycore_global_objects_fini_generated.h	115.04 KB	-rw-r--r--	2025-04-08 13:54
pycore_global_strings.h	26.08 KB	-rw-r--r--	2025-04-08 13:54
pycore_hamt.h	3.65 KB	-rw-r--r--	2025-04-08 13:54
pycore_hashtable.h	4.26 KB	-rw-r--r--	2025-04-08 13:54
pycore_identifier.h	515 B	-rw-r--r--	2025-04-08 13:54
pycore_import.h	7.55 KB	-rw-r--r--	2025-04-08 13:54
pycore_importdl.h	3.96 KB	-rw-r--r--	2025-04-08 13:54
pycore_initconfig.h	6.23 KB	-rw-r--r--	2025-04-08 13:54
pycore_instruction_sequence.h	2.11 KB	-rw-r--r--	2025-04-08 13:54
pycore_instruments.h	2.28 KB	-rw-r--r--	2025-04-08 13:54
pycore_interp.h	14.71 KB	-rw-r--r--	2025-04-08 13:54
pycore_intrinsics.h	1.71 KB	-rw-r--r--	2025-04-08 13:54
pycore_jit.h	527 B	-rw-r--r--	2025-04-08 13:54
pycore_list.h	1.82 KB	-rw-r--r--	2025-04-08 13:54
pycore_llist.h	2.36 KB	-rw-r--r--	2025-04-08 13:54
pycore_lock.h	8.34 KB	-rw-r--r--	2025-04-08 13:54
pycore_long.h	9.73 KB	-rw-r--r--	2025-04-08 13:54
pycore_memoryobject.h	427 B	-rw-r--r--	2025-04-08 13:54
pycore_mimalloc.h	1.6 KB	-rw-r--r--	2025-04-08 13:54
pycore_modsupport.h	3.27 KB	-rw-r--r--	2025-04-08 13:54
pycore_moduleobject.h	1.54 KB	-rw-r--r--	2025-04-08 13:54
pycore_namespace.h	435 B	-rw-r--r--	2025-04-08 13:54
pycore_object.h	26.64 KB	-rw-r--r--	2025-04-08 13:54
pycore_object_alloc.h	2.13 KB	-rw-r--r--	2025-04-08 13:54
pycore_object_stack.h	2.33 KB	-rw-r--r--	2025-04-08 13:54
pycore_object_state.h	942 B	-rw-r--r--	2025-04-08 13:54
pycore_obmalloc.h	26.78 KB	-rw-r--r--	2025-04-08 13:54
pycore_obmalloc_init.h	1.89 KB	-rw-r--r--	2025-04-08 13:54
pycore_opcode_metadata.h	82.74 KB	-rw-r--r--	2025-04-08 13:54
pycore_opcode_utils.h	2.07 KB	-rw-r--r--	2025-04-08 13:54
pycore_optimizer.h	8.11 KB	-rw-r--r--	2025-04-08 13:54
pycore_parking_lot.h	3.27 KB	-rw-r--r--	2025-04-08 13:54
pycore_parser.h	2.04 KB	-rw-r--r--	2025-04-08 13:54
pycore_pathconfig.h	658 B	-rw-r--r--	2025-04-08 13:54
pycore_pyarena.h	2.79 KB	-rw-r--r--	2025-04-08 13:54
pycore_pyatomic_ft_wrappers.h	7.87 KB	-rw-r--r--	2025-04-08 13:54
pycore_pybuffer.h	510 B	-rw-r--r--	2025-04-08 13:54
pycore_pyerrors.h	4.84 KB	-rw-r--r--	2025-04-08 13:54
pycore_pyhash.h	2.75 KB	-rw-r--r--	2025-04-08 13:54
pycore_pylifecycle.h	4.36 KB	-rw-r--r--	2025-04-08 13:54
pycore_pymath.h	8.4 KB	-rw-r--r--	2025-04-08 13:54
pycore_pymem.h	4.37 KB	-rw-r--r--	2025-04-08 13:54
pycore_pymem_init.h	3.44 KB	-rw-r--r--	2025-04-08 13:54
pycore_pystate.h	9.73 KB	-rw-r--r--	2025-04-08 13:54
pycore_pystats.h	420 B	-rw-r--r--	2025-04-08 13:54
pycore_pythonrun.h	758 B	-rw-r--r--	2025-04-08 13:54
pycore_pythread.h	5.3 KB	-rw-r--r--	2025-04-08 13:54
pycore_qsbr.h	4.81 KB	-rw-r--r--	2025-04-08 13:54
pycore_range.h	346 B	-rw-r--r--	2025-04-08 13:54
pycore_runtime.h	12.84 KB	-rw-r--r--	2025-04-08 13:54
pycore_runtime_init.h	12.74 KB	-rw-r--r--	2025-04-08 13:54
pycore_runtime_init_generated.h	45.72 KB	-rw-r--r--	2025-04-08 13:54
pycore_semaphore.h	1.69 KB	-rw-r--r--	2025-04-08 13:54
pycore_setobject.h	951 B	-rw-r--r--	2025-04-08 13:54
pycore_signal.h	2.86 KB	-rw-r--r--	2025-04-08 13:54
pycore_sliceobject.h	369 B	-rw-r--r--	2025-04-08 13:54
pycore_stackref.h	5.06 KB	-rw-r--r--	2025-04-08 13:54
pycore_strhex.h	1013 B	-rw-r--r--	2025-04-08 13:54
pycore_structseq.h	963 B	-rw-r--r--	2025-04-08 13:54
pycore_symtable.h	8.47 KB	-rw-r--r--	2025-04-08 13:54
pycore_sysmodule.h	1.15 KB	-rw-r--r--	2025-04-08 13:54
pycore_time.h	11.52 KB	-rw-r--r--	2025-04-08 13:54
pycore_token.h	2.93 KB	-rw-r--r--	2025-04-08 13:54
pycore_traceback.h	3.54 KB	-rw-r--r--	2025-04-08 13:54
pycore_tracemalloc.h	4.43 KB	-rw-r--r--	2025-04-08 13:54
pycore_tstate.h	1.32 KB	-rw-r--r--	2025-04-08 13:54
pycore_tuple.h	820 B	-rw-r--r--	2025-04-08 13:54
pycore_typeobject.h	8.67 KB	-rw-r--r--	2025-04-08 13:54
pycore_typevarobject.h	924 B	-rw-r--r--	2025-04-08 13:54
pycore_ucnhash.h	958 B	-rw-r--r--	2025-04-08 13:54
pycore_unicodeobject.h	12.15 KB	-rw-r--r--	2025-04-08 13:54
pycore_unicodeobject_generated.h	129.04 KB	-rw-r--r--	2025-04-08 13:54
pycore_unionobject.h	742 B	-rw-r--r--	2025-04-08 13:54
pycore_uop_ids.h	10.03 KB	-rw-r--r--	2025-04-08 13:54
pycore_uop_metadata.h	38.54 KB	-rw-r--r--	2025-04-08 13:54
pycore_warnings.h	840 B	-rw-r--r--	2025-04-08 13:54
pycore_weakref.h	3.25 KB	-rw-r--r--	2025-04-08 13:54

Rename

// The QSBR APIs (quiescent state-based reclamation) provide a mechanism for
// the free-threaded build to safely reclaim memory when there may be
// concurrent accesses.
//
// Many operations in the free-threaded build are protected by locks. However,
// in some cases, we want to allow reads to happen concurrently with updates.
// In this case, we need to delay freeing ("reclaiming") any memory that may be
// concurrently accessed by a reader. The QSBR APIs provide a way to do this.
#ifndef Py_INTERNAL_QSBR_H
#define Py_INTERNAL_QSBR_H

#include <stdbool.h>
#include <stdint.h>
#include "pycore_lock.h"        // PyMutex

#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

// The shared write sequence is always odd and incremented by two. Detached
// threads are indicated by a read sequence of zero. This avoids collisions
// between the offline state and any valid sequence number even if the
// sequences numbers wrap around.
#define QSBR_OFFLINE 0
#define QSBR_INITIAL 1
#define QSBR_INCR    2

// Wrap-around safe comparison. This is a holdover from the FreeBSD
// implementation, which uses 32-bit sequence numbers. We currently use 64-bit
// sequence numbers, so wrap-around is unlikely.
#define QSBR_LT(a, b) ((int64_t)((a)-(b)) < 0)
#define QSBR_LEQ(a, b) ((int64_t)((a)-(b)) <= 0)

struct _qsbr_shared;
struct _PyThreadStateImpl;  // forward declare to avoid circular dependency

// Per-thread state
struct _qsbr_thread_state {
    // Last observed write sequence (or 0 if detached)
    uint64_t seq;

// Shared (per-interpreter) QSBR state
    struct _qsbr_shared *shared;

// Thread state (or NULL)
    PyThreadState *tstate;

// Used to defer advancing write sequence a fixed number of times
    int deferrals;

// Is this thread state allocated?
    bool allocated;
    struct _qsbr_thread_state *freelist_next;
};

// Padding to avoid false sharing
struct _qsbr_pad {
    struct _qsbr_thread_state qsbr;
    char __padding[64 - sizeof(struct _qsbr_thread_state)];
};

// Per-interpreter state
struct _qsbr_shared {
    // Write sequence: always odd, incremented by two
    uint64_t wr_seq;

// Minimum observed read sequence of all QSBR thread states
    uint64_t rd_seq;

// Array of QSBR thread states.
    struct _qsbr_pad *array;
    Py_ssize_t size;

// Freelist of unused _qsbr_thread_states (protected by mutex)
    PyMutex mutex;
    struct _qsbr_thread_state *freelist;
};

static inline uint64_t
_Py_qsbr_shared_current(struct _qsbr_shared *shared)
{
    return _Py_atomic_load_uint64_acquire(&shared->wr_seq);
}

// Reports a quiescent state: the caller no longer holds any pointer to shared
// data not protected by locks or reference counts.
static inline void
_Py_qsbr_quiescent_state(struct _qsbr_thread_state *qsbr)
{
    uint64_t seq = _Py_qsbr_shared_current(qsbr->shared);
    _Py_atomic_store_uint64_release(&qsbr->seq, seq);
}

// Have the read sequences advanced to the given goal? Like `_Py_qsbr_poll()`,
// but does not perform a scan of threads.
static inline bool
_Py_qbsr_goal_reached(struct _qsbr_thread_state *qsbr, uint64_t goal)
{
    uint64_t rd_seq = _Py_atomic_load_uint64(&qsbr->shared->rd_seq);
    return QSBR_LEQ(goal, rd_seq);
}

// Advance the write sequence and return the new goal. This should be called
// after data is removed. The returned goal is used with `_Py_qsbr_poll()` to
// determine when it is safe to reclaim (free) the memory.
extern uint64_t
_Py_qsbr_advance(struct _qsbr_shared *shared);

// Batches requests to advance the write sequence. This advances the write
// sequence every N calls, which reduces overhead but increases time to
// reclamation. Returns the new goal.
extern uint64_t
_Py_qsbr_deferred_advance(struct _qsbr_thread_state *qsbr);

// Have the read sequences advanced to the given goal? If this returns true,
// it safe to reclaim any memory tagged with the goal (or earlier goal).
extern bool
_Py_qsbr_poll(struct _qsbr_thread_state *qsbr, uint64_t goal);

// Called when thread attaches to interpreter
extern void
_Py_qsbr_attach(struct _qsbr_thread_state *qsbr);

// Called when thread detaches from interpreter
extern void
_Py_qsbr_detach(struct _qsbr_thread_state *qsbr);

// Reserves (allocates) a QSBR state and returns its index.
extern Py_ssize_t
_Py_qsbr_reserve(PyInterpreterState *interp);

// Associates a PyThreadState with the QSBR state at the given index
extern void
_Py_qsbr_register(struct _PyThreadStateImpl *tstate,
                  PyInterpreterState *interp, Py_ssize_t index);

// Disassociates a PyThreadState from the QSBR state and frees the QSBR state.
extern void
_Py_qsbr_unregister(PyThreadState *tstate);

extern void
_Py_qsbr_fini(PyInterpreterState *interp);

extern void
_Py_qsbr_after_fork(struct _PyThreadStateImpl *tstate);

#ifdef __cplusplus
}
#endif
#endif   /* !Py_INTERNAL_QSBR_H */