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pystate.c
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1841 lines (1555 loc) · 52.4 KB
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/* Thread and interpreter state structures and their interfaces */
#include "Python.h"
#include "pycore_ceval.h"
#include "pycore_initconfig.h"
#include "pycore_pyerrors.h"
#include "pycore_pylifecycle.h"
#include "pycore_pymem.h" // _PyMem_SetDefaultAllocator()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_sysmodule.h"
/* --------------------------------------------------------------------------
CAUTION
Always use PyMem_RawMalloc() and PyMem_RawFree() directly in this file. A
number of these functions are advertised as safe to call when the GIL isn't
held, and in a debug build Python redirects (e.g.) PyMem_NEW (etc) to Python's
debugging obmalloc functions. Those aren't thread-safe (they rely on the GIL
to avoid the expense of doing their own locking).
-------------------------------------------------------------------------- */
#ifdef HAVE_DLOPEN
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#if !HAVE_DECL_RTLD_LAZY
#define RTLD_LAZY 1
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define _PyRuntimeGILState_GetThreadState(gilstate) \
((PyThreadState*)_Py_atomic_load_relaxed(&(gilstate)->tstate_current))
#define _PyRuntimeGILState_SetThreadState(gilstate, value) \
_Py_atomic_store_relaxed(&(gilstate)->tstate_current, \
(uintptr_t)(value))
/* Forward declarations */
static PyThreadState *_PyGILState_GetThisThreadState(struct _gilstate_runtime_state *gilstate);
static void _PyThreadState_Delete(PyThreadState *tstate, int check_current);
static PyStatus
_PyRuntimeState_Init_impl(_PyRuntimeState *runtime)
{
/* We preserve the hook across init, because there is
currently no public API to set it between runtime
initialization and interpreter initialization. */
void *open_code_hook = runtime->open_code_hook;
void *open_code_userdata = runtime->open_code_userdata;
_Py_AuditHookEntry *audit_hook_head = runtime->audit_hook_head;
memset(runtime, 0, sizeof(*runtime));
runtime->open_code_hook = open_code_hook;
runtime->open_code_userdata = open_code_userdata;
runtime->audit_hook_head = audit_hook_head;
_PyEval_InitRuntimeState(&runtime->ceval);
PyPreConfig_InitPythonConfig(&runtime->preconfig);
runtime->gilstate.check_enabled = 1;
/* A TSS key must be initialized with Py_tss_NEEDS_INIT
in accordance with the specification. */
Py_tss_t initial = Py_tss_NEEDS_INIT;
runtime->gilstate.autoTSSkey = initial;
runtime->interpreters.mutex = PyThread_allocate_lock();
if (runtime->interpreters.mutex == NULL) {
return _PyStatus_ERR("Can't initialize threads for interpreter");
}
runtime->interpreters.next_id = -1;
runtime->xidregistry.mutex = PyThread_allocate_lock();
if (runtime->xidregistry.mutex == NULL) {
return _PyStatus_ERR("Can't initialize threads for cross-interpreter data registry");
}
// Set it to the ID of the main thread of the main interpreter.
runtime->main_thread = PyThread_get_thread_ident();
return _PyStatus_OK();
}
PyStatus
_PyRuntimeState_Init(_PyRuntimeState *runtime)
{
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
PyStatus status = _PyRuntimeState_Init_impl(runtime);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return status;
}
void
_PyRuntimeState_Fini(_PyRuntimeState *runtime)
{
/* Force the allocator used by _PyRuntimeState_Init(). */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (runtime->interpreters.mutex != NULL) {
PyThread_free_lock(runtime->interpreters.mutex);
runtime->interpreters.mutex = NULL;
}
if (runtime->xidregistry.mutex != NULL) {
PyThread_free_lock(runtime->xidregistry.mutex);
runtime->xidregistry.mutex = NULL;
}
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
}
#ifdef HAVE_FORK
/* This function is called from PyOS_AfterFork_Child to ensure that
* newly created child processes do not share locks with the parent.
*/
void
_PyRuntimeState_ReInitThreads(_PyRuntimeState *runtime)
{
// This was initially set in _PyRuntimeState_Init().
runtime->main_thread = PyThread_get_thread_ident();
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
int interp_mutex = _PyThread_at_fork_reinit(&runtime->interpreters.mutex);
int xidregistry_mutex = _PyThread_at_fork_reinit(&runtime->xidregistry.mutex);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
/* bpo-42540: id_mutex is freed by _PyInterpreterState_Delete, which does
* not force the default allocator. */
int main_interp_id_mutex = _PyThread_at_fork_reinit(&runtime->interpreters.main->id_mutex);
if (interp_mutex < 0) {
Py_FatalError("Can't initialize lock for runtime interpreters");
}
if (main_interp_id_mutex < 0) {
Py_FatalError("Can't initialize ID lock for main interpreter");
}
if (xidregistry_mutex < 0) {
Py_FatalError("Can't initialize lock for cross-interpreter data registry");
}
}
#endif
#define HEAD_LOCK(runtime) \
PyThread_acquire_lock((runtime)->interpreters.mutex, WAIT_LOCK)
#define HEAD_UNLOCK(runtime) \
PyThread_release_lock((runtime)->interpreters.mutex)
/* Forward declaration */
static void _PyGILState_NoteThreadState(
struct _gilstate_runtime_state *gilstate, PyThreadState* tstate);
PyStatus
_PyInterpreterState_Enable(_PyRuntimeState *runtime)
{
struct pyinterpreters *interpreters = &runtime->interpreters;
interpreters->next_id = 0;
/* Py_Finalize() calls _PyRuntimeState_Fini() which clears the mutex.
Create a new mutex if needed. */
if (interpreters->mutex == NULL) {
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
interpreters->mutex = PyThread_allocate_lock();
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (interpreters->mutex == NULL) {
return _PyStatus_ERR("Can't initialize threads for interpreter");
}
}
return _PyStatus_OK();
}
PyInterpreterState *
PyInterpreterState_New(void)
{
PyThreadState *tstate = _PyThreadState_GET();
/* tstate is NULL when Py_InitializeFromConfig() calls
PyInterpreterState_New() to create the main interpreter. */
if (_PySys_Audit(tstate, "cpython.PyInterpreterState_New", NULL) < 0) {
return NULL;
}
PyInterpreterState *interp = PyMem_RawCalloc(1, sizeof(PyInterpreterState));
if (interp == NULL) {
return NULL;
}
interp->id_refcount = -1;
/* Don't get runtime from tstate since tstate can be NULL */
_PyRuntimeState *runtime = &_PyRuntime;
interp->runtime = runtime;
if (_PyEval_InitState(&interp->ceval) < 0) {
goto out_of_memory;
}
_PyGC_InitState(&interp->gc);
PyConfig_InitPythonConfig(&interp->config);
interp->eval_frame = _PyEval_EvalFrameDefault;
#ifdef HAVE_DLOPEN
#if HAVE_DECL_RTLD_NOW
interp->dlopenflags = RTLD_NOW;
#else
interp->dlopenflags = RTLD_LAZY;
#endif
#endif
struct pyinterpreters *interpreters = &runtime->interpreters;
HEAD_LOCK(runtime);
if (interpreters->next_id < 0) {
/* overflow or Py_Initialize() not called! */
if (tstate != NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"failed to get an interpreter ID");
}
PyMem_RawFree(interp);
interp = NULL;
}
else {
interp->id = interpreters->next_id;
interpreters->next_id += 1;
interp->next = interpreters->head;
if (interpreters->main == NULL) {
interpreters->main = interp;
}
interpreters->head = interp;
}
HEAD_UNLOCK(runtime);
if (interp == NULL) {
return NULL;
}
interp->tstate_next_unique_id = 0;
interp->audit_hooks = NULL;
return interp;
out_of_memory:
if (tstate != NULL) {
_PyErr_NoMemory(tstate);
}
PyMem_RawFree(interp);
return NULL;
}
void
PyInterpreterState_Clear(PyInterpreterState *interp)
{
_PyRuntimeState *runtime = interp->runtime;
/* Use the current Python thread state to call audit hooks,
not the current Python thread state of 'interp'. */
PyThreadState *tstate = _PyThreadState_GET();
if (_PySys_Audit(tstate, "cpython.PyInterpreterState_Clear", NULL) < 0) {
_PyErr_Clear(tstate);
}
// Clear the current/main thread state last.
HEAD_LOCK(runtime);
PyThreadState *p = interp->tstate_head;
HEAD_UNLOCK(runtime);
while (p != NULL) {
// See https://github.com/python/cpython/issues/102126
// Must be called without HEAD_LOCK held as it can deadlock
// if any finalizer tries to acquire that lock.
PyThreadState_Clear(p);
HEAD_LOCK(runtime);
p = p->next;
HEAD_UNLOCK(runtime);
}
Py_CLEAR(interp->audit_hooks);
PyConfig_Clear(&interp->config);
Py_CLEAR(interp->codec_search_path);
Py_CLEAR(interp->codec_search_cache);
Py_CLEAR(interp->codec_error_registry);
Py_CLEAR(interp->modules);
Py_CLEAR(interp->modules_by_index);
Py_CLEAR(interp->sysdict);
Py_CLEAR(interp->builtins);
Py_CLEAR(interp->builtins_copy);
Py_CLEAR(interp->importlib);
Py_CLEAR(interp->import_func);
Py_CLEAR(interp->dict);
#ifdef HAVE_FORK
Py_CLEAR(interp->before_forkers);
Py_CLEAR(interp->after_forkers_parent);
Py_CLEAR(interp->after_forkers_child);
#endif
if (_PyRuntimeState_GetFinalizing(runtime) == NULL) {
_PyWarnings_Fini(interp);
}
// XXX Once we have one allocator per interpreter (i.e.
// per-interpreter GC) we must ensure that all of the interpreter's
// objects have been cleaned up at the point.
}
static void
zapthreads(PyInterpreterState *interp, int check_current)
{
PyThreadState *tstate;
/* No need to lock the mutex here because this should only happen
when the threads are all really dead (XXX famous last words). */
while ((tstate = interp->tstate_head) != NULL) {
_PyThreadState_Delete(tstate, check_current);
}
}
void
PyInterpreterState_Delete(PyInterpreterState *interp)
{
_PyRuntimeState *runtime = interp->runtime;
struct pyinterpreters *interpreters = &runtime->interpreters;
zapthreads(interp, 0);
_PyEval_FiniState(&interp->ceval);
/* Delete current thread. After this, many C API calls become crashy. */
_PyThreadState_Swap(&runtime->gilstate, NULL);
HEAD_LOCK(runtime);
PyInterpreterState **p;
for (p = &interpreters->head; ; p = &(*p)->next) {
if (*p == NULL) {
Py_FatalError("NULL interpreter");
}
if (*p == interp) {
break;
}
}
if (interp->tstate_head != NULL) {
Py_FatalError("remaining threads");
}
*p = interp->next;
if (interpreters->main == interp) {
interpreters->main = NULL;
if (interpreters->head != NULL) {
Py_FatalError("remaining subinterpreters");
}
}
HEAD_UNLOCK(runtime);
if (interp->id_mutex != NULL) {
PyThread_free_lock(interp->id_mutex);
}
PyMem_RawFree(interp);
}
/*
* Delete all interpreter states except the main interpreter. If there
* is a current interpreter state, it *must* be the main interpreter.
*/
void
_PyInterpreterState_DeleteExceptMain(_PyRuntimeState *runtime)
{
struct _gilstate_runtime_state *gilstate = &runtime->gilstate;
struct pyinterpreters *interpreters = &runtime->interpreters;
PyThreadState *tstate = _PyThreadState_Swap(gilstate, NULL);
if (tstate != NULL && tstate->interp != interpreters->main) {
Py_FatalError("not main interpreter");
}
HEAD_LOCK(runtime);
PyInterpreterState *interp = interpreters->head;
interpreters->head = NULL;
while (interp != NULL) {
if (interp == interpreters->main) {
interpreters->main->next = NULL;
interpreters->head = interp;
interp = interp->next;
continue;
}
PyInterpreterState_Clear(interp); // XXX must activate?
zapthreads(interp, 1);
if (interp->id_mutex != NULL) {
PyThread_free_lock(interp->id_mutex);
}
PyInterpreterState *prev_interp = interp;
interp = interp->next;
PyMem_RawFree(prev_interp);
}
HEAD_UNLOCK(runtime);
if (interpreters->head == NULL) {
Py_FatalError("missing main interpreter");
}
_PyThreadState_Swap(gilstate, tstate);
}
PyInterpreterState *
PyInterpreterState_Get(void)
{
PyThreadState *tstate = _PyThreadState_GET();
_Py_EnsureTstateNotNULL(tstate);
PyInterpreterState *interp = tstate->interp;
if (interp == NULL) {
Py_FatalError("no current interpreter");
}
return interp;
}
int64_t
PyInterpreterState_GetID(PyInterpreterState *interp)
{
if (interp == NULL) {
PyErr_SetString(PyExc_RuntimeError, "no interpreter provided");
return -1;
}
return interp->id;
}
static PyInterpreterState *
interp_look_up_id(_PyRuntimeState *runtime, int64_t requested_id)
{
PyInterpreterState *interp = runtime->interpreters.head;
while (interp != NULL) {
int64_t id = PyInterpreterState_GetID(interp);
if (id < 0) {
return NULL;
}
if (requested_id == id) {
return interp;
}
interp = PyInterpreterState_Next(interp);
}
return NULL;
}
PyInterpreterState *
_PyInterpreterState_LookUpID(int64_t requested_id)
{
PyInterpreterState *interp = NULL;
if (requested_id >= 0) {
_PyRuntimeState *runtime = &_PyRuntime;
HEAD_LOCK(runtime);
interp = interp_look_up_id(runtime, requested_id);
HEAD_UNLOCK(runtime);
}
if (interp == NULL && !PyErr_Occurred()) {
PyErr_Format(PyExc_RuntimeError,
"unrecognized interpreter ID %lld", requested_id);
}
return interp;
}
int
_PyInterpreterState_IDInitref(PyInterpreterState *interp)
{
if (interp->id_mutex != NULL) {
return 0;
}
interp->id_mutex = PyThread_allocate_lock();
if (interp->id_mutex == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"failed to create init interpreter ID mutex");
return -1;
}
interp->id_refcount = 0;
return 0;
}
void
_PyInterpreterState_IDIncref(PyInterpreterState *interp)
{
if (interp->id_mutex == NULL) {
return;
}
PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
interp->id_refcount += 1;
PyThread_release_lock(interp->id_mutex);
}
void
_PyInterpreterState_IDDecref(PyInterpreterState *interp)
{
if (interp->id_mutex == NULL) {
return;
}
struct _gilstate_runtime_state *gilstate = &_PyRuntime.gilstate;
PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
assert(interp->id_refcount != 0);
interp->id_refcount -= 1;
int64_t refcount = interp->id_refcount;
PyThread_release_lock(interp->id_mutex);
if (refcount == 0 && interp->requires_idref) {
// XXX Using the "head" thread isn't strictly correct.
PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
// XXX Possible GILState issues?
PyThreadState *save_tstate = _PyThreadState_Swap(gilstate, tstate);
Py_EndInterpreter(tstate);
_PyThreadState_Swap(gilstate, save_tstate);
}
}
int
_PyInterpreterState_RequiresIDRef(PyInterpreterState *interp)
{
return interp->requires_idref;
}
void
_PyInterpreterState_RequireIDRef(PyInterpreterState *interp, int required)
{
interp->requires_idref = required ? 1 : 0;
}
PyObject *
_PyInterpreterState_GetMainModule(PyInterpreterState *interp)
{
if (interp->modules == NULL) {
PyErr_SetString(PyExc_RuntimeError, "interpreter not initialized");
return NULL;
}
return PyMapping_GetItemString(interp->modules, "__main__");
}
PyObject *
PyInterpreterState_GetDict(PyInterpreterState *interp)
{
if (interp->dict == NULL) {
interp->dict = PyDict_New();
if (interp->dict == NULL) {
PyErr_Clear();
}
}
/* Returning NULL means no per-interpreter dict is available. */
return interp->dict;
}
static PyThreadState *
new_threadstate(PyInterpreterState *interp, int init)
{
_PyRuntimeState *runtime = interp->runtime;
PyThreadState *tstate = (PyThreadState *)PyMem_RawMalloc(sizeof(PyThreadState));
if (tstate == NULL) {
return NULL;
}
tstate->interp = interp;
tstate->frame = NULL;
tstate->recursion_depth = 0;
tstate->overflowed = 0;
tstate->recursion_critical = 0;
tstate->stackcheck_counter = 0;
tstate->tracing = 0;
tstate->use_tracing = 0;
tstate->gilstate_counter = 0;
tstate->async_exc = NULL;
tstate->thread_id = PyThread_get_thread_ident();
tstate->dict = NULL;
tstate->curexc_type = NULL;
tstate->curexc_value = NULL;
tstate->curexc_traceback = NULL;
tstate->exc_state.exc_type = NULL;
tstate->exc_state.exc_value = NULL;
tstate->exc_state.exc_traceback = NULL;
tstate->exc_state.previous_item = NULL;
tstate->exc_info = &tstate->exc_state;
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
tstate->c_profileobj = NULL;
tstate->c_traceobj = NULL;
tstate->trash_delete_nesting = 0;
tstate->trash_delete_later = NULL;
tstate->on_delete = NULL;
tstate->on_delete_data = NULL;
tstate->coroutine_origin_tracking_depth = 0;
tstate->async_gen_firstiter = NULL;
tstate->async_gen_finalizer = NULL;
tstate->context = NULL;
tstate->context_ver = 1;
if (init) {
_PyThreadState_Init(tstate);
}
HEAD_LOCK(runtime);
tstate->id = ++interp->tstate_next_unique_id;
tstate->prev = NULL;
tstate->next = interp->tstate_head;
if (tstate->next)
tstate->next->prev = tstate;
interp->tstate_head = tstate;
HEAD_UNLOCK(runtime);
return tstate;
}
PyThreadState *
PyThreadState_New(PyInterpreterState *interp)
{
return new_threadstate(interp, 1);
}
PyThreadState *
_PyThreadState_Prealloc(PyInterpreterState *interp)
{
return new_threadstate(interp, 0);
}
void
_PyThreadState_Init(PyThreadState *tstate)
{
_PyGILState_NoteThreadState(&tstate->interp->runtime->gilstate, tstate);
}
PyObject*
PyState_FindModule(struct PyModuleDef* module)
{
Py_ssize_t index = module->m_base.m_index;
PyInterpreterState *state = _PyInterpreterState_GET();
PyObject *res;
if (module->m_slots) {
return NULL;
}
if (index == 0)
return NULL;
if (state->modules_by_index == NULL)
return NULL;
if (index >= PyList_GET_SIZE(state->modules_by_index))
return NULL;
res = PyList_GET_ITEM(state->modules_by_index, index);
return res==Py_None ? NULL : res;
}
int
_PyState_AddModule(PyThreadState *tstate, PyObject* module, struct PyModuleDef* def)
{
if (!def) {
assert(_PyErr_Occurred(tstate));
return -1;
}
if (def->m_slots) {
_PyErr_SetString(tstate,
PyExc_SystemError,
"PyState_AddModule called on module with slots");
return -1;
}
PyInterpreterState *interp = tstate->interp;
if (!interp->modules_by_index) {
interp->modules_by_index = PyList_New(0);
if (!interp->modules_by_index) {
return -1;
}
}
while (PyList_GET_SIZE(interp->modules_by_index) <= def->m_base.m_index) {
if (PyList_Append(interp->modules_by_index, Py_None) < 0) {
return -1;
}
}
Py_INCREF(module);
return PyList_SetItem(interp->modules_by_index,
def->m_base.m_index, module);
}
int
PyState_AddModule(PyObject* module, struct PyModuleDef* def)
{
if (!def) {
Py_FatalError("module definition is NULL");
return -1;
}
PyThreadState *tstate = _PyThreadState_GET();
PyInterpreterState *interp = tstate->interp;
Py_ssize_t index = def->m_base.m_index;
if (interp->modules_by_index &&
index < PyList_GET_SIZE(interp->modules_by_index) &&
module == PyList_GET_ITEM(interp->modules_by_index, index))
{
_Py_FatalErrorFormat(__func__, "module %p already added", module);
return -1;
}
return _PyState_AddModule(tstate, module, def);
}
int
PyState_RemoveModule(struct PyModuleDef* def)
{
PyThreadState *tstate = _PyThreadState_GET();
PyInterpreterState *interp = tstate->interp;
if (def->m_slots) {
_PyErr_SetString(tstate,
PyExc_SystemError,
"PyState_RemoveModule called on module with slots");
return -1;
}
Py_ssize_t index = def->m_base.m_index;
if (index == 0) {
Py_FatalError("invalid module index");
}
if (interp->modules_by_index == NULL) {
Py_FatalError("Interpreters module-list not accessible.");
}
if (index > PyList_GET_SIZE(interp->modules_by_index)) {
Py_FatalError("Module index out of bounds.");
}
Py_INCREF(Py_None);
return PyList_SetItem(interp->modules_by_index, index, Py_None);
}
/* Used by PyImport_Cleanup() */
void
_PyInterpreterState_ClearModules(PyInterpreterState *interp)
{
if (!interp->modules_by_index) {
return;
}
Py_ssize_t i;
for (i = 0; i < PyList_GET_SIZE(interp->modules_by_index); i++) {
PyObject *m = PyList_GET_ITEM(interp->modules_by_index, i);
if (PyModule_Check(m)) {
/* cleanup the saved copy of module dicts */
PyModuleDef *md = PyModule_GetDef(m);
if (md) {
Py_CLEAR(md->m_base.m_copy);
}
}
}
/* Setting modules_by_index to NULL could be dangerous, so we
clear the list instead. */
if (PyList_SetSlice(interp->modules_by_index,
0, PyList_GET_SIZE(interp->modules_by_index),
NULL)) {
PyErr_WriteUnraisable(interp->modules_by_index);
}
}
void
PyThreadState_Clear(PyThreadState *tstate)
{
int verbose = _PyInterpreterState_GetConfig(tstate->interp)->verbose;
if (verbose && tstate->frame != NULL) {
/* bpo-20526: After the main thread calls
_PyRuntimeState_SetFinalizing() in Py_FinalizeEx(), threads must
exit when trying to take the GIL. If a thread exit in the middle of
_PyEval_EvalFrameDefault(), tstate->frame is not reset to its
previous value. It is more likely with daemon threads, but it can
happen with regular threads if threading._shutdown() fails
(ex: interrupted by CTRL+C). */
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a frame\n");
}
/* Don't clear tstate->frame: it is a borrowed reference */
Py_CLEAR(tstate->dict);
Py_CLEAR(tstate->async_exc);
Py_CLEAR(tstate->curexc_type);
Py_CLEAR(tstate->curexc_value);
Py_CLEAR(tstate->curexc_traceback);
Py_CLEAR(tstate->exc_state.exc_type);
Py_CLEAR(tstate->exc_state.exc_value);
Py_CLEAR(tstate->exc_state.exc_traceback);
/* The stack of exception states should contain just this thread. */
if (verbose && tstate->exc_info != &tstate->exc_state) {
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a generator\n");
}
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
Py_CLEAR(tstate->c_profileobj);
Py_CLEAR(tstate->c_traceobj);
Py_CLEAR(tstate->async_gen_firstiter);
Py_CLEAR(tstate->async_gen_finalizer);
Py_CLEAR(tstate->context);
if (tstate->on_delete != NULL) {
tstate->on_delete(tstate->on_delete_data);
}
}
/* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
static void
tstate_delete_common(PyThreadState *tstate,
struct _gilstate_runtime_state *gilstate)
{
_Py_EnsureTstateNotNULL(tstate);
PyInterpreterState *interp = tstate->interp;
if (interp == NULL) {
Py_FatalError("NULL interpreter");
}
_PyRuntimeState *runtime = interp->runtime;
HEAD_LOCK(runtime);
if (tstate->prev) {
tstate->prev->next = tstate->next;
}
else {
interp->tstate_head = tstate->next;
}
if (tstate->next) {
tstate->next->prev = tstate->prev;
}
HEAD_UNLOCK(runtime);
if (gilstate->autoInterpreterState &&
PyThread_tss_get(&gilstate->autoTSSkey) == tstate)
{
PyThread_tss_set(&gilstate->autoTSSkey, NULL);
}
}
static void
_PyThreadState_Delete(PyThreadState *tstate, int check_current)
{
struct _gilstate_runtime_state *gilstate = &tstate->interp->runtime->gilstate;
if (check_current) {
if (tstate == _PyRuntimeGILState_GetThreadState(gilstate)) {
_Py_FatalErrorFormat(__func__, "tstate %p is still current", tstate);
}
}
tstate_delete_common(tstate, gilstate);
PyMem_RawFree(tstate);
}
void
PyThreadState_Delete(PyThreadState *tstate)
{
_PyThreadState_Delete(tstate, 1);
}
void
_PyThreadState_DeleteCurrent(PyThreadState *tstate)
{
_Py_EnsureTstateNotNULL(tstate);
struct _gilstate_runtime_state *gilstate = &tstate->interp->runtime->gilstate;
tstate_delete_common(tstate, gilstate);
_PyRuntimeGILState_SetThreadState(gilstate, NULL);
_PyEval_ReleaseLock(tstate);
PyMem_RawFree(tstate);
}
void
PyThreadState_DeleteCurrent(void)
{
struct _gilstate_runtime_state *gilstate = &_PyRuntime.gilstate;
PyThreadState *tstate = _PyRuntimeGILState_GetThreadState(gilstate);
_PyThreadState_DeleteCurrent(tstate);
}
/*
* Delete all thread states except the one passed as argument.
* Note that, if there is a current thread state, it *must* be the one
* passed as argument. Also, this won't touch any other interpreters
* than the current one, since we don't know which thread state should
* be kept in those other interpreters.
*/
void
_PyThreadState_DeleteExcept(_PyRuntimeState *runtime, PyThreadState *tstate)
{
PyInterpreterState *interp = tstate->interp;
HEAD_LOCK(runtime);
/* Remove all thread states, except tstate, from the linked list of
thread states. This will allow calling PyThreadState_Clear()
without holding the lock. */
PyThreadState *list = interp->tstate_head;
if (list == tstate) {
list = tstate->next;
}
if (tstate->prev) {
tstate->prev->next = tstate->next;
}
if (tstate->next) {
tstate->next->prev = tstate->prev;
}
tstate->prev = tstate->next = NULL;
interp->tstate_head = tstate;
HEAD_UNLOCK(runtime);
/* Clear and deallocate all stale thread states. Even if this
executes Python code, we should be safe since it executes
in the current thread, not one of the stale threads. */
PyThreadState *p, *next;
for (p = list; p; p = next) {
next = p->next;
PyThreadState_Clear(p);
PyMem_RawFree(p);
}
}
PyThreadState *
_PyThreadState_UncheckedGet(void)
{
return _PyThreadState_GET();
}
PyThreadState *
PyThreadState_Get(void)
{
PyThreadState *tstate = _PyThreadState_GET();
_Py_EnsureTstateNotNULL(tstate);
return tstate;
}
PyThreadState *
_PyThreadState_Swap(struct _gilstate_runtime_state *gilstate, PyThreadState *newts)
{
PyThreadState *oldts = _PyRuntimeGILState_GetThreadState(gilstate);
_PyRuntimeGILState_SetThreadState(gilstate, newts);
/* It should not be possible for more than one thread state
to be used for a thread. Check this the best we can in debug
builds.
*/
#if defined(Py_DEBUG)
if (newts) {
/* This can be called from PyEval_RestoreThread(). Similar
to it, we need to ensure errno doesn't change.
*/
int err = errno;
PyThreadState *check = _PyGILState_GetThisThreadState(gilstate);
if (check && check->interp == newts->interp && check != newts)
Py_FatalError("Invalid thread state for this thread");
errno = err;
}
#endif
return oldts;
}