1 //! Implements threads.
3 use std::cell::RefCell;
4 use std::collections::hash_map::Entry;
5 use std::convert::TryFrom;
6 use std::num::TryFromIntError;
7 use std::time::{Duration, Instant, SystemTime};
11 use rustc_data_structures::fx::FxHashMap;
12 use rustc_hir::def_id::DefId;
13 use rustc_index::vec::{Idx, IndexVec};
15 use crate::sync::SynchronizationState;
18 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
19 pub enum SchedulingAction {
20 /// Execute step on the active thread.
22 /// Execute a timeout callback.
23 ExecuteTimeoutCallback,
24 /// Execute destructors of the active thread.
30 /// Timeout callbacks can be created by synchronization primitives to tell the
31 /// scheduler that they should be called once some period of time passes.
32 type TimeoutCallback<'mir, 'tcx> =
33 Box<dyn FnOnce(&mut InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>) -> InterpResult<'tcx> + 'tcx>;
35 /// A thread identifier.
36 #[derive(Clone, Copy, Debug, PartialOrd, Ord, PartialEq, Eq, Hash)]
37 pub struct ThreadId(u32);
39 /// The main thread. When it terminates, the whole application terminates.
40 const MAIN_THREAD: ThreadId = ThreadId(0);
43 pub fn to_u32(self) -> u32 {
48 impl Idx for ThreadId {
49 fn new(idx: usize) -> Self {
50 ThreadId(u32::try_from(idx).unwrap())
53 fn index(self) -> usize {
54 usize::try_from(self.0).unwrap()
58 impl TryFrom<u64> for ThreadId {
59 type Error = TryFromIntError;
60 fn try_from(id: u64) -> Result<Self, Self::Error> {
61 u32::try_from(id).map(|id_u32| Self(id_u32))
65 impl From<u32> for ThreadId {
66 fn from(id: u32) -> Self {
72 pub fn to_u32_scalar<'tcx>(&self) -> Scalar<Tag> {
73 Scalar::from_u32(u32::try_from(self.0).unwrap())
77 /// The state of a thread.
78 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
79 pub enum ThreadState {
80 /// The thread is enabled and can be executed.
82 /// The thread tried to join the specified thread and is blocked until that
83 /// thread terminates.
84 BlockedOnJoin(ThreadId),
85 /// The thread is blocked on some synchronization primitive. It is the
86 /// responsibility of the synchronization primitives to track threads that
87 /// are blocked by them.
89 /// The thread has terminated its execution. We do not delete terminated
90 /// threads (FIXME: why?).
94 /// The join status of a thread.
95 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
96 enum ThreadJoinStatus {
97 /// The thread can be joined.
99 /// A thread is detached if its join handle was destroyed and no other
100 /// thread can join it.
102 /// The thread was already joined by some thread and cannot be joined again.
107 pub struct Thread<'mir, 'tcx> {
110 /// Name of the thread.
111 thread_name: Option<Vec<u8>>,
113 /// The virtual call stack.
114 stack: Vec<Frame<'mir, 'tcx, Tag, FrameData<'tcx>>>,
117 join_status: ThreadJoinStatus,
119 /// The temporary used for storing the argument of
120 /// the call to `miri_start_panic` (the panic payload) when unwinding.
121 /// This is pointer-sized, and matches the `Payload` type in `src/libpanic_unwind/miri.rs`.
122 pub(crate) panic_payload: Option<Scalar<Tag>>,
124 /// Last OS error location in memory. It is a 32-bit integer.
125 pub(crate) last_error: Option<MPlaceTy<'tcx, Tag>>,
128 impl<'mir, 'tcx> Thread<'mir, 'tcx> {
129 /// Check if the thread is done executing (no more stack frames). If yes,
130 /// change the state to terminated and return `true`.
131 fn check_terminated(&mut self) -> bool {
132 if self.state == ThreadState::Enabled {
133 if self.stack.is_empty() {
134 self.state = ThreadState::Terminated;
141 /// Get the name of the current thread, or `<unnamed>` if it was not set.
142 fn thread_name(&self) -> &[u8] {
143 if let Some(ref thread_name) = self.thread_name { thread_name } else { b"<unnamed>" }
147 impl<'mir, 'tcx> std::fmt::Debug for Thread<'mir, 'tcx> {
148 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
152 String::from_utf8_lossy(self.thread_name()),
159 impl<'mir, 'tcx> Default for Thread<'mir, 'tcx> {
160 fn default() -> Self {
162 state: ThreadState::Enabled,
165 join_status: ThreadJoinStatus::Joinable,
172 /// A specific moment in time.
176 RealTime(SystemTime),
180 /// How long do we have to wait from now until the specified time?
181 fn get_wait_time(&self) -> Duration {
183 Time::Monotonic(instant) => instant.saturating_duration_since(Instant::now()),
184 Time::RealTime(time) =>
185 time.duration_since(SystemTime::now()).unwrap_or(Duration::new(0, 0)),
190 /// Callbacks are used to implement timeouts. For example, waiting on a
191 /// conditional variable with a timeout creates a callback that is called after
192 /// the specified time and unblocks the thread. If another thread signals on the
193 /// conditional variable, the signal handler deletes the callback.
194 struct TimeoutCallbackInfo<'mir, 'tcx> {
195 /// The callback should be called no earlier than this time.
197 /// The called function.
198 callback: TimeoutCallback<'mir, 'tcx>,
201 impl<'mir, 'tcx> std::fmt::Debug for TimeoutCallbackInfo<'mir, 'tcx> {
202 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
203 write!(f, "TimeoutCallback({:?})", self.call_time)
207 /// A set of threads.
209 pub struct ThreadManager<'mir, 'tcx> {
210 /// Identifier of the currently active thread.
211 active_thread: ThreadId,
212 /// Threads used in the program.
214 /// Note that this vector also contains terminated threads.
215 threads: IndexVec<ThreadId, Thread<'mir, 'tcx>>,
216 /// This field is pub(crate) because the synchronization primitives
217 /// (`crate::sync`) need a way to access it.
218 pub(crate) sync: SynchronizationState,
219 /// A mapping from a thread-local static to an allocation id of a thread
220 /// specific allocation.
221 thread_local_alloc_ids: RefCell<FxHashMap<(DefId, ThreadId), Pointer<Tag>>>,
222 /// A flag that indicates that we should change the active thread.
223 yield_active_thread: bool,
224 /// Callbacks that are called once the specified time passes.
225 timeout_callbacks: FxHashMap<ThreadId, TimeoutCallbackInfo<'mir, 'tcx>>,
228 impl<'mir, 'tcx> Default for ThreadManager<'mir, 'tcx> {
229 fn default() -> Self {
230 let mut threads = IndexVec::new();
231 // Create the main thread and add it to the list of threads.
232 let mut main_thread = Thread::default();
233 // The main thread can *not* be joined on.
234 main_thread.join_status = ThreadJoinStatus::Detached;
235 threads.push(main_thread);
237 active_thread: ThreadId::new(0),
239 sync: SynchronizationState::default(),
240 thread_local_alloc_ids: Default::default(),
241 yield_active_thread: false,
242 timeout_callbacks: FxHashMap::default(),
247 impl<'mir, 'tcx: 'mir> ThreadManager<'mir, 'tcx> {
248 /// Check if we have an allocation for the given thread local static for the
250 fn get_thread_local_alloc_id(&self, def_id: DefId) -> Option<Pointer<Tag>> {
251 self.thread_local_alloc_ids.borrow().get(&(def_id, self.active_thread)).cloned()
254 /// Set the pointer for the allocation of the given thread local
255 /// static for the active thread.
257 /// Panics if a thread local is initialized twice for the same thread.
258 fn set_thread_local_alloc(&self, def_id: DefId, ptr: Pointer<Tag>) {
259 self.thread_local_alloc_ids
261 .try_insert((def_id, self.active_thread), ptr)
265 /// Borrow the stack of the active thread.
266 fn active_thread_stack(&self) -> &[Frame<'mir, 'tcx, Tag, FrameData<'tcx>>] {
267 &self.threads[self.active_thread].stack
270 /// Mutably borrow the stack of the active thread.
271 fn active_thread_stack_mut(&mut self) -> &mut Vec<Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
272 &mut self.threads[self.active_thread].stack
275 /// Create a new thread and returns its id.
276 fn create_thread(&mut self) -> ThreadId {
277 let new_thread_id = ThreadId::new(self.threads.len());
278 self.threads.push(Default::default());
282 /// Set an active thread and return the id of the thread that was active before.
283 fn set_active_thread_id(&mut self, id: ThreadId) -> ThreadId {
284 let active_thread_id = self.active_thread;
285 self.active_thread = id;
286 assert!(self.active_thread.index() < self.threads.len());
290 /// Get the id of the currently active thread.
291 fn get_active_thread_id(&self) -> ThreadId {
295 /// Get the total number of threads that were ever spawn by this program.
296 fn get_total_thread_count(&self) -> usize {
300 /// Has the given thread terminated?
301 fn has_terminated(&self, thread_id: ThreadId) -> bool {
302 self.threads[thread_id].state == ThreadState::Terminated
305 /// Enable the thread for execution. The thread must be terminated.
306 fn enable_thread(&mut self, thread_id: ThreadId) {
307 assert!(self.has_terminated(thread_id));
308 self.threads[thread_id].state = ThreadState::Enabled;
311 /// Get a mutable borrow of the currently active thread.
312 fn active_thread_mut(&mut self) -> &mut Thread<'mir, 'tcx> {
313 &mut self.threads[self.active_thread]
316 /// Get a shared borrow of the currently active thread.
317 fn active_thread_ref(&self) -> &Thread<'mir, 'tcx> {
318 &self.threads[self.active_thread]
321 /// Mark the thread as detached, which means that no other thread will try
322 /// to join it and the thread is responsible for cleaning up.
323 fn detach_thread(&mut self, id: ThreadId) -> InterpResult<'tcx> {
324 if self.threads[id].join_status != ThreadJoinStatus::Joinable {
325 throw_ub_format!("trying to detach thread that was already detached or joined");
327 self.threads[id].join_status = ThreadJoinStatus::Detached;
331 /// Mark that the active thread tries to join the thread with `joined_thread_id`.
334 joined_thread_id: ThreadId,
335 data_race: Option<&mut data_race::GlobalState>,
336 ) -> InterpResult<'tcx> {
337 if self.threads[joined_thread_id].join_status != ThreadJoinStatus::Joinable {
338 throw_ub_format!("trying to join a detached or already joined thread");
340 if joined_thread_id == self.active_thread {
341 throw_ub_format!("trying to join itself");
346 .all(|thread| thread.state != ThreadState::BlockedOnJoin(joined_thread_id)),
347 "a joinable thread already has threads waiting for its termination"
349 // Mark the joined thread as being joined so that we detect if other
350 // threads try to join it.
351 self.threads[joined_thread_id].join_status = ThreadJoinStatus::Joined;
352 if self.threads[joined_thread_id].state != ThreadState::Terminated {
353 // The joined thread is still running, we need to wait for it.
354 self.active_thread_mut().state = ThreadState::BlockedOnJoin(joined_thread_id);
356 "{:?} blocked on {:?} when trying to join",
361 // The thread has already terminated - mark join happens-before
362 if let Some(data_race) = data_race {
363 data_race.thread_joined(self.active_thread, joined_thread_id);
369 /// Set the name of the active thread.
370 fn set_thread_name(&mut self, new_thread_name: Vec<u8>) {
371 self.active_thread_mut().thread_name = Some(new_thread_name);
374 /// Get the name of the active thread.
375 fn get_thread_name(&self) -> &[u8] {
376 self.active_thread_ref().thread_name()
379 /// Put the thread into the blocked state.
380 fn block_thread(&mut self, thread: ThreadId) {
381 let state = &mut self.threads[thread].state;
382 assert_eq!(*state, ThreadState::Enabled);
383 *state = ThreadState::BlockedOnSync;
386 /// Put the blocked thread into the enabled state.
387 fn unblock_thread(&mut self, thread: ThreadId) {
388 let state = &mut self.threads[thread].state;
389 assert_eq!(*state, ThreadState::BlockedOnSync);
390 *state = ThreadState::Enabled;
393 /// Change the active thread to some enabled thread.
394 fn yield_active_thread(&mut self) {
395 // We do not yield immediately, as swapping out the current stack while executing a MIR statement
396 // could lead to all sorts of confusion.
397 // We should only switch stacks between steps.
398 self.yield_active_thread = true;
401 /// Register the given `callback` to be called once the `call_time` passes.
403 /// The callback will be called with `thread` being the active thread, and
404 /// the callback may not change the active thread.
405 fn register_timeout_callback(
409 callback: TimeoutCallback<'mir, 'tcx>,
411 self.timeout_callbacks
412 .try_insert(thread, TimeoutCallbackInfo { call_time, callback })
416 /// Unregister the callback for the `thread`.
417 fn unregister_timeout_callback_if_exists(&mut self, thread: ThreadId) {
418 self.timeout_callbacks.remove(&thread);
421 /// Get a callback that is ready to be called.
422 fn get_ready_callback(&mut self) -> Option<(ThreadId, TimeoutCallback<'mir, 'tcx>)> {
423 // We iterate over all threads in the order of their indices because
424 // this allows us to have a deterministic scheduler.
425 for thread in self.threads.indices() {
426 match self.timeout_callbacks.entry(thread) {
427 Entry::Occupied(entry) =>
428 if entry.get().call_time.get_wait_time() == Duration::new(0, 0) {
429 return Some((thread, entry.remove().callback));
431 Entry::Vacant(_) => {}
437 /// Wakes up threads joining on the active one and deallocates thread-local statics.
438 /// The `AllocId` that can now be freed are returned.
439 fn thread_terminated(
441 mut data_race: Option<&mut data_race::GlobalState>,
442 ) -> Vec<Pointer<Tag>> {
443 let mut free_tls_statics = Vec::new();
445 let mut thread_local_statics = self.thread_local_alloc_ids.borrow_mut();
446 thread_local_statics.retain(|&(_def_id, thread), &mut alloc_id| {
447 if thread != self.active_thread {
448 // Keep this static around.
451 // Delete this static from the map and from memory.
452 // We cannot free directly here as we cannot use `?` in this context.
453 free_tls_statics.push(alloc_id);
457 // Set the thread into a terminated state in the data-race detector
458 if let Some(ref mut data_race) = data_race {
459 data_race.thread_terminated();
461 // Check if we need to unblock any threads.
462 for (i, thread) in self.threads.iter_enumerated_mut() {
463 if thread.state == ThreadState::BlockedOnJoin(self.active_thread) {
464 // The thread has terminated, mark happens-before edge to joining thread
465 if let Some(ref mut data_race) = data_race {
466 data_race.thread_joined(i, self.active_thread);
468 trace!("unblocking {:?} because {:?} terminated", i, self.active_thread);
469 thread.state = ThreadState::Enabled;
472 return free_tls_statics;
475 /// Decide which action to take next and on which thread.
477 /// The currently implemented scheduling policy is the one that is commonly
478 /// used in stateless model checkers such as Loom: run the active thread as
479 /// long as we can and switch only when we have to (the active thread was
480 /// blocked, terminated, or has explicitly asked to be preempted).
483 data_race: &Option<data_race::GlobalState>,
484 ) -> InterpResult<'tcx, SchedulingAction> {
485 // Check whether the thread has **just** terminated (`check_terminated`
486 // checks whether the thread has popped all its stack and if yes, sets
487 // the thread state to terminated).
488 if self.threads[self.active_thread].check_terminated() {
489 return Ok(SchedulingAction::ExecuteDtors);
491 // If we get here again and the thread is *still* terminated, there are no more dtors to run.
492 if self.threads[MAIN_THREAD].state == ThreadState::Terminated {
493 // The main thread terminated; stop the program.
494 if self.threads.iter().any(|thread| thread.state != ThreadState::Terminated) {
495 // FIXME: This check should be either configurable or just emit
496 // a warning. For example, it seems normal for a program to
497 // terminate without waiting for its detached threads to
498 // terminate. However, this case is not trivial to support
499 // because we also probably do not want to consider the memory
500 // owned by these threads as leaked.
501 throw_unsup_format!("the main thread terminated without waiting for other threads");
503 return Ok(SchedulingAction::Stop);
505 // This thread and the program can keep going.
506 if self.threads[self.active_thread].state == ThreadState::Enabled
507 && !self.yield_active_thread
509 // The currently active thread is still enabled, just continue with it.
510 return Ok(SchedulingAction::ExecuteStep);
512 // The active thread yielded. Let's see if there are any timeouts to take care of. We do
513 // this *before* running any other thread, to ensure that timeouts "in the past" fire before
514 // any other thread can take an action. This ensures that for `pthread_cond_timedwait`, "an
515 // error is returned if [...] the absolute time specified by abstime has already been passed
516 // at the time of the call".
517 // <https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_timedwait.html>
518 let potential_sleep_time =
519 self.timeout_callbacks.values().map(|info| info.call_time.get_wait_time()).min();
520 if potential_sleep_time == Some(Duration::new(0, 0)) {
521 return Ok(SchedulingAction::ExecuteTimeoutCallback);
523 // No callbacks scheduled, pick a regular thread to execute.
524 // We need to pick a new thread for execution.
525 for (id, thread) in self.threads.iter_enumerated() {
526 if thread.state == ThreadState::Enabled {
527 if !self.yield_active_thread || id != self.active_thread {
528 self.active_thread = id;
529 if let Some(data_race) = data_race {
530 data_race.thread_set_active(self.active_thread);
536 self.yield_active_thread = false;
537 if self.threads[self.active_thread].state == ThreadState::Enabled {
538 return Ok(SchedulingAction::ExecuteStep);
540 // We have not found a thread to execute.
541 if self.threads.iter().all(|thread| thread.state == ThreadState::Terminated) {
542 unreachable!("all threads terminated without the main thread terminating?!");
543 } else if let Some(sleep_time) = potential_sleep_time {
544 // All threads are currently blocked, but we have unexecuted
545 // timeout_callbacks, which may unblock some of the threads. Hence,
546 // sleep until the first callback.
547 std::thread::sleep(sleep_time);
548 Ok(SchedulingAction::ExecuteTimeoutCallback)
550 throw_machine_stop!(TerminationInfo::Deadlock);
555 // Public interface to thread management.
556 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
557 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
558 /// Get a thread-specific allocation id for the given thread-local static.
559 /// If needed, allocate a new one.
560 fn get_or_create_thread_local_alloc(
563 ) -> InterpResult<'tcx, Pointer<Tag>> {
564 let this = self.eval_context_mut();
566 if let Some(old_alloc) = this.machine.threads.get_thread_local_alloc_id(def_id) {
567 // We already have a thread-specific allocation id for this
568 // thread-local static.
571 // We need to allocate a thread-specific allocation id for this
572 // thread-local static.
573 // First, we compute the initial value for this static.
574 if tcx.is_foreign_item(def_id) {
575 throw_unsup_format!("foreign thread-local statics are not supported");
577 let allocation = tcx.eval_static_initializer(def_id)?;
578 // Create a fresh allocation with this content.
580 this.memory.allocate_with(allocation.clone(), MiriMemoryKind::Tls.into());
581 this.machine.threads.set_thread_local_alloc(def_id, new_alloc);
587 fn create_thread(&mut self) -> ThreadId {
588 let this = self.eval_context_mut();
589 let id = this.machine.threads.create_thread();
590 if let Some(data_race) = &mut this.memory.extra.data_race {
591 data_race.thread_created(id);
597 fn detach_thread(&mut self, thread_id: ThreadId) -> InterpResult<'tcx> {
598 let this = self.eval_context_mut();
599 this.machine.threads.detach_thread(thread_id)
603 fn join_thread(&mut self, joined_thread_id: ThreadId) -> InterpResult<'tcx> {
604 let this = self.eval_context_mut();
605 this.machine.threads.join_thread(joined_thread_id, this.memory.extra.data_race.as_mut())?;
610 fn set_active_thread(&mut self, thread_id: ThreadId) -> ThreadId {
611 let this = self.eval_context_mut();
612 if let Some(data_race) = &this.memory.extra.data_race {
613 data_race.thread_set_active(thread_id);
615 this.machine.threads.set_active_thread_id(thread_id)
619 fn get_active_thread(&self) -> ThreadId {
620 let this = self.eval_context_ref();
621 this.machine.threads.get_active_thread_id()
625 fn active_thread_mut(&mut self) -> &mut Thread<'mir, 'tcx> {
626 let this = self.eval_context_mut();
627 this.machine.threads.active_thread_mut()
631 fn active_thread_ref(&self) -> &Thread<'mir, 'tcx> {
632 let this = self.eval_context_ref();
633 this.machine.threads.active_thread_ref()
637 fn get_total_thread_count(&self) -> usize {
638 let this = self.eval_context_ref();
639 this.machine.threads.get_total_thread_count()
643 fn has_terminated(&self, thread_id: ThreadId) -> bool {
644 let this = self.eval_context_ref();
645 this.machine.threads.has_terminated(thread_id)
649 fn enable_thread(&mut self, thread_id: ThreadId) {
650 let this = self.eval_context_mut();
651 this.machine.threads.enable_thread(thread_id);
655 fn active_thread_stack(&self) -> &[Frame<'mir, 'tcx, Tag, FrameData<'tcx>>] {
656 let this = self.eval_context_ref();
657 this.machine.threads.active_thread_stack()
661 fn active_thread_stack_mut(&mut self) -> &mut Vec<Frame<'mir, 'tcx, Tag, FrameData<'tcx>>> {
662 let this = self.eval_context_mut();
663 this.machine.threads.active_thread_stack_mut()
667 fn set_active_thread_name(&mut self, new_thread_name: Vec<u8>) {
668 let this = self.eval_context_mut();
669 if let Some(data_race) = &mut this.memory.extra.data_race {
670 if let Ok(string) = String::from_utf8(new_thread_name.clone()) {
671 data_race.thread_set_name(this.machine.threads.active_thread, string);
674 this.machine.threads.set_thread_name(new_thread_name);
678 fn get_active_thread_name<'c>(&'c self) -> &'c [u8]
682 let this = self.eval_context_ref();
683 this.machine.threads.get_thread_name()
687 fn block_thread(&mut self, thread: ThreadId) {
688 let this = self.eval_context_mut();
689 this.machine.threads.block_thread(thread);
693 fn unblock_thread(&mut self, thread: ThreadId) {
694 let this = self.eval_context_mut();
695 this.machine.threads.unblock_thread(thread);
699 fn yield_active_thread(&mut self) {
700 let this = self.eval_context_mut();
701 this.machine.threads.yield_active_thread();
705 fn register_timeout_callback(
709 callback: TimeoutCallback<'mir, 'tcx>,
711 let this = self.eval_context_mut();
712 this.machine.threads.register_timeout_callback(thread, call_time, callback);
716 fn unregister_timeout_callback_if_exists(&mut self, thread: ThreadId) {
717 let this = self.eval_context_mut();
718 this.machine.threads.unregister_timeout_callback_if_exists(thread);
721 /// Execute a timeout callback on the callback's thread.
723 fn run_timeout_callback(&mut self) -> InterpResult<'tcx> {
724 let this = self.eval_context_mut();
725 let (thread, callback) =
726 if let Some((thread, callback)) = this.machine.threads.get_ready_callback() {
729 // get_ready_callback can return None if the computer's clock
730 // was shifted after calling the scheduler and before the call
731 // to get_ready_callback (see issue
732 // https://github.com/rust-lang/miri/issues/1763). In this case,
733 // just do nothing, which effectively just returns to the
737 // This back-and-forth with `set_active_thread` is here because of two
739 // 1. Make the caller and not the callback responsible for changing
741 // 2. Make the scheduler the only place that can change the active
743 let old_thread = this.set_active_thread(thread);
745 this.set_active_thread(old_thread);
749 /// Decide which action to take next and on which thread.
751 fn schedule(&mut self) -> InterpResult<'tcx, SchedulingAction> {
752 let this = self.eval_context_mut();
753 let data_race = &this.memory.extra.data_race;
754 this.machine.threads.schedule(data_race)
757 /// Handles thread termination of the active thread: wakes up threads joining on this one,
758 /// and deallocated thread-local statics.
760 /// This is called from `tls.rs` after handling the TLS dtors.
762 fn thread_terminated(&mut self) -> InterpResult<'tcx> {
763 let this = self.eval_context_mut();
764 for ptr in this.machine.threads.thread_terminated(this.memory.extra.data_race.as_mut()) {
765 this.memory.deallocate(ptr.into(), None, MiriMemoryKind::Tls.into())?;