#define _PyLong_DIGIT_INIT(val) \
{ \
- .ob_base = _PyObject_HEAD_INIT(&PyLong_Type) \
+ .ob_base = _PyObject_HEAD_INIT(&PyLong_Type), \
.long_value = { \
.lv_tag = TAG_FROM_SIGN_AND_SIZE( \
(val) == 0 ? 0 : ((val) < 0 ? -1 : 1), \
Furthermore, we can't use designated initializers in Extensions since these
are not supported pre-C++20. Thus, keeping an internal copy here is the most
backwards compatible solution */
+#if defined(Py_NOGIL)
+#define _PyObject_HEAD_INIT(type) \
+ { \
+ .ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL, \
+ .ob_type = (type) \
+ }
+#else
#define _PyObject_HEAD_INIT(type) \
{ \
.ob_refcnt = _Py_IMMORTAL_REFCNT, \
.ob_type = (type) \
- },
+ }
+#endif
#define _PyVarObject_HEAD_INIT(type, size) \
{ \
- .ob_base = _PyObject_HEAD_INIT(type) \
+ .ob_base = _PyObject_HEAD_INIT(type), \
.ob_size = size \
- },
+ }
extern void _Py_NO_RETURN _Py_FatalRefcountErrorFunc(
const char *func,
#ifdef Py_REF_DEBUG
_Py_AddRefTotal(_PyInterpreterState_GET(), n);
#endif
+#if !defined(Py_NOGIL)
op->ob_refcnt += n;
+#else
+ if (_Py_IsOwnedByCurrentThread(op)) {
+ uint32_t local = op->ob_ref_local;
+ Py_ssize_t refcnt = (Py_ssize_t)local + n;
+# if PY_SSIZE_T_MAX > UINT32_MAX
+ if (refcnt > (Py_ssize_t)UINT32_MAX) {
+ // Make the object immortal if the 32-bit local reference count
+ // would overflow.
+ refcnt = _Py_IMMORTAL_REFCNT_LOCAL;
+ }
+# endif
+ _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, (uint32_t)refcnt);
+ }
+ else {
+ _Py_atomic_add_ssize(&op->ob_ref_shared, (n << _Py_REF_SHARED_SHIFT));
+ }
+#endif
}
#define _Py_RefcntAdd(op, n) _Py_RefcntAdd(_PyObject_CAST(op), n)
static inline void _Py_SetImmortal(PyObject *op)
{
if (op) {
+#ifdef Py_NOGIL
+ op->ob_tid = _Py_UNOWNED_TID;
+ op->ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL;
+ op->ob_ref_shared = 0;
+#else
op->ob_refcnt = _Py_IMMORTAL_REFCNT;
+#endif
}
}
#define _Py_SetImmortal(op) _Py_SetImmortal(_PyObject_CAST(op))
+// Makes an immortal object mortal again with the specified refcnt. Should only
+// be used during runtime finalization.
+static inline void _Py_SetMortal(PyObject *op, Py_ssize_t refcnt)
+{
+ if (op) {
+ assert(_Py_IsImmortal(op));
+#ifdef Py_NOGIL
+ op->ob_tid = _Py_UNOWNED_TID;
+ op->ob_ref_local = 0;
+ op->ob_ref_shared = _Py_REF_SHARED(refcnt, _Py_REF_MERGED);
+#else
+ op->ob_refcnt = refcnt;
+#endif
+ }
+}
+
/* _Py_ClearImmortal() should only be used during runtime finalization. */
static inline void _Py_ClearImmortal(PyObject *op)
{
if (op) {
- assert(op->ob_refcnt == _Py_IMMORTAL_REFCNT);
- op->ob_refcnt = 1;
+ _Py_SetMortal(op, 1);
Py_DECREF(op);
}
}
op = NULL; \
} while (0)
+#if !defined(Py_NOGIL)
static inline void
_Py_DECREF_SPECIALIZED(PyObject *op, const destructor destruct)
{
#endif
}
+#else
+// TODO: implement Py_DECREF specializations for Py_NOGIL build
+static inline void
+_Py_DECREF_SPECIALIZED(PyObject *op, const destructor destruct)
+{
+ Py_DECREF(op);
+}
+
+static inline void
+_Py_DECREF_NO_DEALLOC(PyObject *op)
+{
+ Py_DECREF(op);
+}
+
+static inline int
+_Py_REF_IS_MERGED(Py_ssize_t ob_ref_shared)
+{
+ return (ob_ref_shared & _Py_REF_SHARED_FLAG_MASK) == _Py_REF_MERGED;
+}
+
+static inline int
+_Py_REF_IS_QUEUED(Py_ssize_t ob_ref_shared)
+{
+ return (ob_ref_shared & _Py_REF_SHARED_FLAG_MASK) == _Py_REF_QUEUED;
+}
+
+// Merge the local and shared reference count fields and add `extra` to the
+// refcount when merging.
+Py_ssize_t _Py_ExplicitMergeRefcount(PyObject *op, Py_ssize_t extra);
+#endif // !defined(Py_NOGIL)
+
#ifdef Py_REF_DEBUG
# undef _Py_DEC_REFTOTAL
#endif
.latin1 = _Py_str_latin1_INIT, \
}, \
.tuple_empty = { \
- .ob_base = _PyVarObject_HEAD_INIT(&PyTuple_Type, 0) \
+ .ob_base = _PyVarObject_HEAD_INIT(&PyTuple_Type, 0), \
}, \
.hamt_bitmap_node_empty = { \
- .ob_base = _PyVarObject_HEAD_INIT(&_PyHamt_BitmapNode_Type, 0) \
+ .ob_base = _PyVarObject_HEAD_INIT(&_PyHamt_BitmapNode_Type, 0), \
}, \
.context_token_missing = { \
- .ob_base = _PyObject_HEAD_INIT(&_PyContextTokenMissing_Type) \
+ .ob_base = _PyObject_HEAD_INIT(&_PyContextTokenMissing_Type), \
}, \
}, \
}, \
.singletons = { \
._not_used = 1, \
.hamt_empty = { \
- .ob_base = _PyObject_HEAD_INIT(&_PyHamt_Type) \
+ .ob_base = _PyObject_HEAD_INIT(&_PyHamt_Type), \
.h_root = (PyHamtNode*)&_Py_SINGLETON(hamt_bitmap_node_empty), \
}, \
.last_resort_memory_error = { \
- _PyObject_HEAD_INIT(&_PyExc_MemoryError) \
+ _PyObject_HEAD_INIT(&_PyExc_MemoryError), \
.args = (PyObject*)&_Py_SINGLETON(tuple_empty) \
}, \
}, \
#define _PyBytes_SIMPLE_INIT(CH, LEN) \
{ \
- _PyVarObject_HEAD_INIT(&PyBytes_Type, (LEN)) \
+ _PyVarObject_HEAD_INIT(&PyBytes_Type, (LEN)), \
.ob_shash = -1, \
.ob_sval = { (CH) }, \
}
#define _PyUnicode_ASCII_BASE_INIT(LITERAL, ASCII) \
{ \
- .ob_base = _PyObject_HEAD_INIT(&PyUnicode_Type) \
+ .ob_base = _PyObject_HEAD_INIT(&PyUnicode_Type), \
.length = sizeof(LITERAL) - 1, \
.hash = -1, \
.state = { \
#define _Py_IMMORTAL_REFCNT (UINT_MAX >> 2)
#endif
+// Py_NOGIL builds indicate immortal objects using `ob_ref_local`, which is
+// always 32-bits.
+#ifdef Py_NOGIL
+#define _Py_IMMORTAL_REFCNT_LOCAL UINT32_MAX
+#endif
+
// Make all internal uses of PyObject_HEAD_INIT immortal while preserving the
// C-API expectation that the refcnt will be set to 1.
-#ifdef Py_BUILD_CORE
+#if defined(Py_NOGIL)
+#define PyObject_HEAD_INIT(type) \
+ { \
+ 0, \
+ 0, \
+ 0, \
+ 0, \
+ _Py_IMMORTAL_REFCNT_LOCAL, \
+ 0, \
+ (type), \
+ },
+#elif defined(Py_BUILD_CORE)
#define PyObject_HEAD_INIT(type) \
{ \
{ _Py_IMMORTAL_REFCNT }, \
* by hand. Similarly every pointer to a variable-size Python object can,
* in addition, be cast to PyVarObject*.
*/
+#ifndef Py_NOGIL
struct _object {
#if (defined(__GNUC__) || defined(__clang__)) \
&& !(defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)
PyTypeObject *ob_type;
};
+#else
+// Objects that are not owned by any thread use a thread id (tid) of zero.
+// This includes both immortal objects and objects whose reference count
+// fields have been merged.
+#define _Py_UNOWNED_TID 0
+
+// The shared reference count uses the two least-significant bits to store
+// flags. The remaining bits are used to store the reference count.
+#define _Py_REF_SHARED_SHIFT 2
+#define _Py_REF_SHARED_FLAG_MASK 0x3
+
+// The shared flags are initialized to zero.
+#define _Py_REF_SHARED_INIT 0x0
+#define _Py_REF_MAYBE_WEAKREF 0x1
+#define _Py_REF_QUEUED 0x2
+#define _Py_REF_MERGED 0x3
+
+// Create a shared field from a refcnt and desired flags
+#define _Py_REF_SHARED(refcnt, flags) (((refcnt) << _Py_REF_SHARED_SHIFT) + (flags))
+
+struct _object {
+ uintptr_t ob_tid; // thread id (or zero)
+ uint16_t _padding;
+ uint8_t ob_mutex; // per-object lock
+ uint8_t ob_gc_bits; // gc-related state
+ uint32_t ob_ref_local; // local reference count
+ Py_ssize_t ob_ref_shared; // shared (atomic) reference count
+ PyTypeObject *ob_type;
+};
+#endif
/* Cast argument to PyObject* type. */
#define _PyObject_CAST(op) _Py_CAST(PyObject*, (op))
PyAPI_FUNC(int) Py_Is(PyObject *x, PyObject *y);
#define Py_Is(x, y) ((x) == (y))
+#ifndef Py_LIMITED_API
+static inline uintptr_t
+_Py_ThreadId(void)
+{
+ uintptr_t tid;
+#if defined(_MSC_VER) && defined(_M_X64)
+ tid = __readgsqword(48);
+#elif defined(_MSC_VER) && defined(_M_IX86)
+ tid = __readfsdword(24);
+#elif defined(_MSC_VER) && defined(_M_ARM64)
+ tid = __getReg(18);
+#elif defined(__i386__)
+ __asm__("movl %%gs:0, %0" : "=r" (tid)); // 32-bit always uses GS
+#elif defined(__MACH__) && defined(__x86_64__)
+ __asm__("movq %%gs:0, %0" : "=r" (tid)); // x86_64 macOSX uses GS
+#elif defined(__x86_64__)
+ __asm__("movq %%fs:0, %0" : "=r" (tid)); // x86_64 Linux, BSD uses FS
+#elif defined(__arm__)
+ __asm__ ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tid));
+#elif defined(__aarch64__) && defined(__APPLE__)
+ __asm__ ("mrs %0, tpidrro_el0" : "=r" (tid));
+#elif defined(__aarch64__)
+ __asm__ ("mrs %0, tpidr_el0" : "=r" (tid));
+#else
+ # error "define _Py_ThreadId for this platform"
+#endif
+ return tid;
+}
+#endif
+
+#if defined(Py_NOGIL) && !defined(Py_LIMITED_API)
+static inline Py_ALWAYS_INLINE int
+_Py_IsOwnedByCurrentThread(PyObject *ob)
+{
+ return ob->ob_tid == _Py_ThreadId();
+}
+#endif
static inline Py_ssize_t Py_REFCNT(PyObject *ob) {
+#if !defined(Py_NOGIL)
return ob->ob_refcnt;
+#else
+ uint32_t local = _Py_atomic_load_uint32_relaxed(&ob->ob_ref_local);
+ if (local == _Py_IMMORTAL_REFCNT_LOCAL) {
+ return _Py_IMMORTAL_REFCNT;
+ }
+ Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&ob->ob_ref_shared);
+ return _Py_STATIC_CAST(Py_ssize_t, local) +
+ Py_ARITHMETIC_RIGHT_SHIFT(Py_ssize_t, shared, _Py_REF_SHARED_SHIFT);
+#endif
}
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
# define Py_REFCNT(ob) Py_REFCNT(_PyObject_CAST(ob))
static inline Py_ALWAYS_INLINE int _Py_IsImmortal(PyObject *op)
{
-#if SIZEOF_VOID_P > 4
+#if defined(Py_NOGIL)
+ return op->ob_ref_local == _Py_IMMORTAL_REFCNT_LOCAL;
+#elif SIZEOF_VOID_P > 4
return _Py_CAST(PY_INT32_T, op->ob_refcnt) < 0;
#else
return op->ob_refcnt == _Py_IMMORTAL_REFCNT;
if (_Py_IsImmortal(ob)) {
return;
}
+#if !defined(Py_NOGIL)
ob->ob_refcnt = refcnt;
+#else
+ if (_Py_IsOwnedByCurrentThread(ob)) {
+ // Set local refcount to desired refcount and shared refcount to zero,
+ // but preserve the shared refcount flags.
+ assert(refcnt < UINT32_MAX);
+ ob->ob_ref_local = _Py_STATIC_CAST(uint32_t, refcnt);
+ ob->ob_ref_shared &= _Py_REF_SHARED_FLAG_MASK;
+ }
+ else {
+ // Set local refcount to zero and shared refcount to desired refcount.
+ // Mark the object as merged.
+ ob->ob_tid = _Py_UNOWNED_TID;
+ ob->ob_ref_local = 0;
+ ob->ob_ref_shared = _Py_REF_SHARED(refcnt, _Py_REF_MERGED);
+ }
+#endif
}
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
# define Py_SET_REFCNT(ob, refcnt) Py_SET_REFCNT(_PyObject_CAST(ob), (refcnt))
#else
// Non-limited C API and limited C API for Python 3.9 and older access
// directly PyObject.ob_refcnt.
-#if SIZEOF_VOID_P > 4
+#if defined(Py_NOGIL)
+ uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
+ uint32_t new_local = local + 1;
+ if (new_local == 0) {
+ return;
+ }
+ if (_Py_IsOwnedByCurrentThread(op)) {
+ _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, new_local);
+ }
+ else {
+ _Py_atomic_add_ssize(&op->ob_ref_shared, (1 << _Py_REF_SHARED_SHIFT));
+ }
+#elif SIZEOF_VOID_P > 4
// Portable saturated add, branching on the carry flag and set low bits
PY_UINT32_T cur_refcnt = op->ob_refcnt_split[PY_BIG_ENDIAN];
PY_UINT32_T new_refcnt = cur_refcnt + 1;
# define Py_INCREF(op) Py_INCREF(_PyObject_CAST(op))
#endif
+
+#if !defined(Py_LIMITED_API) && defined(Py_NOGIL)
+// Implements Py_DECREF on objects not owned by the current thread.
+PyAPI_FUNC(void) _Py_DecRefShared(PyObject *);
+PyAPI_FUNC(void) _Py_DecRefSharedDebug(PyObject *, const char *, int);
+
+// Called from Py_DECREF by the owning thread when the local refcount reaches
+// zero. The call will deallocate the object if the shared refcount is also
+// zero. Otherwise, the thread gives up ownership and merges the reference
+// count fields.
+PyAPI_FUNC(void) _Py_MergeZeroLocalRefcount(PyObject *);
+#endif
+
#if defined(Py_LIMITED_API) && (Py_LIMITED_API+0 >= 0x030c0000 || defined(Py_REF_DEBUG))
// Stable ABI implements Py_DECREF() as a function call on limited C API
// version 3.12 and newer, and on Python built in debug mode. _Py_DecRef() was
}
#define Py_DECREF(op) Py_DECREF(_PyObject_CAST(op))
+#elif defined(Py_NOGIL) && defined(Py_REF_DEBUG)
+static inline void Py_DECREF(const char *filename, int lineno, PyObject *op)
+{
+ uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
+ if (local == _Py_IMMORTAL_REFCNT_LOCAL) {
+ return;
+ }
+ _Py_DECREF_STAT_INC();
+ _Py_DECREF_DecRefTotal();
+ if (_Py_IsOwnedByCurrentThread(op)) {
+ if (local == 0) {
+ _Py_NegativeRefcount(filename, lineno, op);
+ }
+ local--;
+ _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, local);
+ if (local == 0) {
+ _Py_MergeZeroLocalRefcount(op);
+ }
+ }
+ else {
+ _Py_DecRefSharedDebug(op, filename, lineno);
+ }
+}
+#define Py_DECREF(op) Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))
+
+#elif defined(Py_NOGIL)
+static inline void Py_DECREF(PyObject *op)
+{
+ uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
+ if (local == _Py_IMMORTAL_REFCNT_LOCAL) {
+ return;
+ }
+ _Py_DECREF_STAT_INC();
+ if (_Py_IsOwnedByCurrentThread(op)) {
+ local--;
+ _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, local);
+ if (local == 0) {
+ _Py_MergeZeroLocalRefcount(op);
+ }
+ }
+ else {
+ _Py_DecRefShared(op);
+ }
+}
+#define Py_DECREF(op) Py_DECREF(_PyObject_CAST(op))
+
#elif defined(Py_REF_DEBUG)
static inline void Py_DECREF(const char *filename, int lineno, PyObject *op)
{
return any(option in cflags_nodist for option in pgo_options)
-_header = 'nP'
+if sysconfig.get_config_var('Py_NOGIL'):
+ _header = 'PHBBInP'
+else:
+ _header = 'nP'
_align = '0n'
_vheader = _header + 'n'
--- /dev/null
+Implement biased reference counting in ``--disable-gil`` builds.
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
// gh-85283: On Windows, Py_LIMITED_API requires Py_BUILD_CORE to not attempt
// linking the extension to python3.lib (which fails). Py_BUILD_CORE_MODULE is
posixshmem - A Python extension that provides shm_open() and shm_unlink()
*/
+#include "pyconfig.h" // Py_NOGIL
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include <Python.h>
* using the SystemConfiguration framework.
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include <Python.h>
#include <SystemConfiguration/SystemConfiguration.h>
*
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
// Need limited C API version 3.13 for PyModule_Add() on Windows
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x030c0000 // 3.12
+#endif
+
#include "parts.h"
#include <stddef.h> // max_align_t
#include <string.h> // memset
/* Test Vectorcall in the limited API */
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x030c0000 // 3.12
+#endif
+
#include "parts.h"
#include "clinic/vectorcall_limited.c.h"
#undef Py_BUILD_CORE_MODULE
#undef Py_BUILD_CORE_BUILTIN
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
// For now, only limited C API 3.13 is supported
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x030d0000
+#endif
/* Always enable assertions */
#undef NDEBUG
* foo, bar), only the first one is called the same as the compiled file.
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x03020000
+#endif
#include <Python.h>
* DCE compatible Universally Unique Identifier library.
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
#if defined(HAVE_UUID_H)
/* Errno module */
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
#include <errno.h> // EPIPE
/* MD5 objects */
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
#include "hashlib.h"
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
#include <errno.h> // errno
pass
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include "Python.h"
#include <string.h>
* See the xxlimited module for an extension module template.
*/
+#ifndef _MSC_VER
+#include "pyconfig.h" // Py_NOGIL
+#endif
+
+#ifndef Py_NOGIL
#define Py_LIMITED_API 0x03050000
+#endif
#include "Python.h"
Py_DECREF(o);
}
+#ifdef Py_NOGIL
+static inline int
+is_shared_refcnt_dead(Py_ssize_t shared)
+{
+#if SIZEOF_SIZE_T == 8
+ return shared == (Py_ssize_t)0xDDDDDDDDDDDDDDDD;
+#else
+ return shared == (Py_ssize_t)0xDDDDDDDD;
+#endif
+}
+
+void
+_Py_DecRefSharedDebug(PyObject *o, const char *filename, int lineno)
+{
+ // Should we queue the object for the owning thread to merge?
+ int should_queue;
+
+ Py_ssize_t new_shared;
+ Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&o->ob_ref_shared);
+ do {
+ should_queue = (shared == 0 || shared == _Py_REF_MAYBE_WEAKREF);
+
+ if (should_queue) {
+ // If the object had refcount zero, not queued, and not merged,
+ // then we enqueue the object to be merged by the owning thread.
+ // In this case, we don't subtract one from the reference count
+ // because the queue holds a reference.
+ new_shared = _Py_REF_QUEUED;
+ }
+ else {
+ // Otherwise, subtract one from the reference count. This might
+ // be negative!
+ new_shared = shared - (1 << _Py_REF_SHARED_SHIFT);
+ }
+
+#ifdef Py_REF_DEBUG
+ if ((_Py_REF_IS_MERGED(new_shared) && new_shared < 0) ||
+ is_shared_refcnt_dead(shared))
+ {
+ _Py_NegativeRefcount(filename, lineno, o);
+ }
+#endif
+ } while (!_Py_atomic_compare_exchange_ssize(&o->ob_ref_shared,
+ &shared, new_shared));
+
+ if (should_queue) {
+ // TODO: the inter-thread queue is not yet implemented. For now,
+ // we just merge the refcount here.
+ Py_ssize_t refcount = _Py_ExplicitMergeRefcount(o, -1);
+ if (refcount == 0) {
+ _Py_Dealloc(o);
+ }
+ }
+ else if (new_shared == _Py_REF_MERGED) {
+ // refcount is zero AND merged
+ _Py_Dealloc(o);
+ }
+}
+
+void
+_Py_DecRefShared(PyObject *o)
+{
+ _Py_DecRefSharedDebug(o, NULL, 0);
+}
+
+void
+_Py_MergeZeroLocalRefcount(PyObject *op)
+{
+ assert(op->ob_ref_local == 0);
+
+ _Py_atomic_store_uintptr_relaxed(&op->ob_tid, 0);
+ Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&op->ob_ref_shared);
+ if (shared == 0) {
+ // Fast-path: shared refcount is zero (including flags)
+ _Py_Dealloc(op);
+ return;
+ }
+
+ // Slow-path: atomically set the flags (low two bits) to _Py_REF_MERGED.
+ Py_ssize_t new_shared;
+ do {
+ new_shared = (shared & ~_Py_REF_SHARED_FLAG_MASK) | _Py_REF_MERGED;
+ } while (!_Py_atomic_compare_exchange_ssize(&op->ob_ref_shared,
+ &shared, new_shared));
+
+ if (new_shared == _Py_REF_MERGED) {
+ // i.e., the shared refcount is zero (only the flags are set) so we
+ // deallocate the object.
+ _Py_Dealloc(op);
+ }
+}
+
+Py_ssize_t
+_Py_ExplicitMergeRefcount(PyObject *op, Py_ssize_t extra)
+{
+ assert(!_Py_IsImmortal(op));
+ Py_ssize_t refcnt;
+ Py_ssize_t new_shared;
+ Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&op->ob_ref_shared);
+ do {
+ refcnt = Py_ARITHMETIC_RIGHT_SHIFT(Py_ssize_t, shared, _Py_REF_SHARED_SHIFT);
+ if (_Py_REF_IS_MERGED(shared)) {
+ return refcnt;
+ }
+
+ refcnt += (Py_ssize_t)op->ob_ref_local;
+ refcnt += extra;
+
+ new_shared = _Py_REF_SHARED(refcnt, _Py_REF_MERGED);
+ } while (!_Py_atomic_compare_exchange_ssize(&op->ob_ref_shared,
+ &shared, new_shared));
+
+ _Py_atomic_store_uint32_relaxed(&op->ob_ref_local, 0);
+ _Py_atomic_store_uintptr_relaxed(&op->ob_tid, 0);
+ return refcnt;
+}
+#endif
+
/**************************************/
none_new, /*tp_new */
};
-PyObject _Py_NoneStruct = {
- { _Py_IMMORTAL_REFCNT },
- &_PyNone_Type
-};
+PyObject _Py_NoneStruct = _PyObject_HEAD_INIT(&_PyNone_Type);
/* NotImplemented is an object that can be used to signal that an
operation is not implemented for the given type combination. */
notimplemented_new, /*tp_new */
};
-PyObject _Py_NotImplementedStruct = {
- { _Py_IMMORTAL_REFCNT },
- &_PyNotImplemented_Type
-};
+PyObject _Py_NotImplementedStruct = _PyObject_HEAD_INIT(&_PyNotImplemented_Type);
PyStatus
_PyTraceMalloc_NewReference(op);
}
// Skip the immortal object check in Py_SET_REFCNT; always set refcnt to 1
+#if !defined(Py_NOGIL)
op->ob_refcnt = 1;
+#else
+ op->ob_tid = _Py_ThreadId();
+ op->_padding = 0;
+ op->ob_mutex = 0;
+ op->ob_gc_bits = 0;
+ op->ob_ref_local = 1;
+ op->ob_ref_shared = 0;
+#endif
#ifdef Py_TRACE_REFS
_Py_AddToAllObjects(op);
#endif
Py_TPFLAGS_DEFAULT, /*tp_flags */
};
-static PyObject _dummy_struct = {
- { _Py_IMMORTAL_REFCNT },
- &_PySetDummy_Type
-};
+static PyObject _dummy_struct = _PyObject_HEAD_INIT(&_PySetDummy_Type);
ellipsis_new, /* tp_new */
};
-PyObject _Py_EllipsisObject = {
- { _Py_IMMORTAL_REFCNT },
- &PyEllipsis_Type
-};
+PyObject _Py_EllipsisObject = _PyObject_HEAD_INIT(&PyEllipsis_Type);
/* Slice object implementation */
// Skip the Immortal Instance check and restore
// the two references (key and value) ignored
// by PyUnicode_InternInPlace().
- s->ob_refcnt = 2;
+ _Py_SetMortal(s, 2);
#ifdef INTERNED_STATS
total_length += PyUnicode_GET_LENGTH(s);
#endif
winsound.PlaySound(None, 0)
*/
+#ifndef Py_NOGIL
// Need limited C API version 3.13 for Py_MOD_PER_INTERPRETER_GIL_SUPPORTED
#define Py_LIMITED_API 0x030d0000
+#endif
#include <Python.h>
#include <windows.h>
# error "ceval.c must be build with Py_BUILD_CORE define for best performance"
#endif
-#if !defined(Py_DEBUG) && !defined(Py_TRACE_REFS)
+#if !defined(Py_DEBUG) && !defined(Py_TRACE_REFS) && !defined(Py_NOGIL)
// GH-89279: The MSVC compiler does not inline these static inline functions
// in PGO build in _PyEval_EvalFrameDefault(), because this function is over
// the limit of PGO, and that limit cannot be configured.
// Define them as macros to make sure that they are always inlined by the
// preprocessor.
+// TODO: implement Py_DECREF macro for Py_NOGIL
#undef Py_DECREF
#define Py_DECREF(arg) \
/* Uncomment this to dump debugging output when assertions fail */
// #define INSTRUMENT_DEBUG 1
-PyObject _PyInstrumentation_DISABLE =
-{
- .ob_refcnt = _Py_IMMORTAL_REFCNT,
- .ob_type = &PyBaseObject_Type
-};
+PyObject _PyInstrumentation_DISABLE = _PyObject_HEAD_INIT(&PyBaseObject_Type);
-PyObject _PyInstrumentation_MISSING =
-{
- .ob_refcnt = _Py_IMMORTAL_REFCNT,
- .ob_type = &PyBaseObject_Type
-};
+PyObject _PyInstrumentation_MISSING = _PyObject_HEAD_INIT(&PyBaseObject_Type);
static const int8_t EVENT_FOR_OPCODE[256] = {
[RETURN_CONST] = PY_MONITORING_EVENT_PY_RETURN,
};
const struct _PyCode_DEF(8) _Py_InitCleanup = {
- _PyVarObject_HEAD_INIT(&PyCode_Type, 3)
+ _PyVarObject_HEAD_INIT(&PyCode_Type, 3),
.co_consts = (PyObject *)&_Py_SINGLETON(tuple_empty),
.co_names = (PyObject *)&_Py_SINGLETON(tuple_empty),
.co_exceptiontable = (PyObject *)&_Py_SINGLETON(bytes_empty),
self.inits: list[str] = []
self.identifiers, self.strings = self.get_identifiers_and_strings()
self.write('#include "Python.h"')
+ self.write('#include "internal/pycore_object.h"')
self.write('#include "internal/pycore_gc.h"')
self.write('#include "internal/pycore_code.h"')
self.write('#include "internal/pycore_frame.h"')
self.write("}" + suffix)
def object_head(self, typename: str) -> None:
- with self.block(".ob_base =", ","):
- self.write(f".ob_refcnt = _Py_IMMORTAL_REFCNT,")
- self.write(f".ob_type = &{typename},")
+ self.write(f".ob_base = _PyObject_HEAD_INIT(&{typename}),")
def object_var_head(self, typename: str, size: int) -> None:
- with self.block(".ob_base =", ","):
- self.object_head(typename)
- self.write(f".ob_size = {size},")
+ self.write(f".ob_base = _PyVarObject_HEAD_INIT(&{typename}, {size}),")
def field(self, obj: object, name: str) -> None:
self.write(f".{name} = {getattr(obj, name)},")
projects / thirdparty / Python / cpython.git / commitdiff
