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![Ryan Macnak](/assets/img/avatar_default.png)
Note this would be unsafe even if under a safepoint operation because not all of the queried threads participate in safepoints. TEST=tsan Bug: https://github.com/dart-lang/sdk/issues/44304 Bug: https://github.com/dart-lang/sdk/issues/44385 Change-Id: I8156e8c6049165e5c53b66c3391f3e8a496ddaaf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175000 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>
149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/thread_registry.h"
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#include "vm/json_stream.h"
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#include "vm/lockers.h"
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namespace dart {
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ThreadRegistry::~ThreadRegistry() {
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// Go over the free thread list and delete the thread objects.
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{
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MonitorLocker ml(threads_lock());
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// At this point the active list should be empty.
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ASSERT(active_list_ == NULL);
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// Now delete all the threads in the free list.
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while (free_list_ != NULL) {
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Thread* thread = free_list_;
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free_list_ = thread->next_;
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delete thread;
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}
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}
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}
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Thread* ThreadRegistry::GetFreeThreadLocked(bool is_vm_isolate) {
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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Thread* thread = GetFromFreelistLocked(is_vm_isolate);
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ASSERT(thread->api_top_scope() == NULL);
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// Now add this Thread to the active list for the isolate.
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AddToActiveListLocked(thread);
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return thread;
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}
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void ThreadRegistry::ReturnThreadLocked(Thread* thread) {
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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// Remove thread from the active list for the isolate.
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RemoveFromActiveListLocked(thread);
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ReturnToFreelistLocked(thread);
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}
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void ThreadRegistry::VisitObjectPointers(
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IsolateGroup* isolate_group_of_interest,
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ObjectPointerVisitor* visitor,
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ValidationPolicy validate_frames) {
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MonitorLocker ml(threads_lock());
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Thread* thread = active_list_;
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while (thread != NULL) {
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if (thread->isolate_group() == isolate_group_of_interest) {
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// The mutator thread is visited by the isolate itself (see
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// [IsolateGroup::VisitStackPointers]).
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if (!thread->IsMutatorThread()) {
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thread->VisitObjectPointers(visitor, validate_frames);
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}
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}
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thread = thread->next_;
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}
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}
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void ThreadRegistry::ReleaseStoreBuffers() {
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MonitorLocker ml(threads_lock());
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Thread* thread = active_list_;
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while (thread != NULL) {
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if (!thread->BypassSafepoints()) {
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thread->ReleaseStoreBuffer();
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}
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thread = thread->next_;
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}
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}
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void ThreadRegistry::AcquireMarkingStacks() {
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MonitorLocker ml(threads_lock());
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Thread* thread = active_list_;
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while (thread != NULL) {
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if (!thread->BypassSafepoints()) {
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thread->MarkingStackAcquire();
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thread->DeferredMarkingStackAcquire();
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}
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thread = thread->next_;
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}
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}
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void ThreadRegistry::ReleaseMarkingStacks() {
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MonitorLocker ml(threads_lock());
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Thread* thread = active_list_;
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while (thread != NULL) {
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if (!thread->BypassSafepoints()) {
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thread->MarkingStackRelease();
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thread->DeferredMarkingStackRelease();
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ASSERT(!thread->is_marking());
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}
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thread = thread->next_;
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}
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}
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void ThreadRegistry::AddToActiveListLocked(Thread* thread) {
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ASSERT(thread != NULL);
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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thread->next_ = active_list_;
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active_list_ = thread;
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}
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void ThreadRegistry::RemoveFromActiveListLocked(Thread* thread) {
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ASSERT(thread != NULL);
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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Thread* prev = NULL;
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Thread* current = active_list_;
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while (current != NULL) {
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if (current == thread) {
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if (prev == NULL) {
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active_list_ = current->next_;
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} else {
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prev->next_ = current->next_;
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}
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break;
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}
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prev = current;
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current = current->next_;
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}
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}
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Thread* ThreadRegistry::GetFromFreelistLocked(bool is_vm_isolate) {
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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Thread* thread = NULL;
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// Get thread structure from free list or create a new one.
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if (free_list_ == NULL) {
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thread = new Thread(is_vm_isolate);
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} else {
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thread = free_list_;
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free_list_ = thread->next_;
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}
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return thread;
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}
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void ThreadRegistry::ReturnToFreelistLocked(Thread* thread) {
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ASSERT(thread != NULL);
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ASSERT(thread->os_thread() == NULL);
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ASSERT(thread->isolate_ == NULL);
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ASSERT(thread->heap_ == NULL);
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ASSERT(threads_lock()->IsOwnedByCurrentThread());
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// Add thread to the free list.
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thread->next_ = free_list_;
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free_list_ = thread;
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}
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} // namespace dart
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