d0e0bf21bd
by using C++11's default field initializers. Bug: v8:8238 Change-Id: I3f5f4994114da61efb5b3c22681e6c472cf6e3dc Reviewed-on: https://chromium-review.googlesource.com/c/1302054 Commit-Queue: Igor Sheludko <ishell@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#57074}
122 lines
2.7 KiB
C++
122 lines
2.7 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_V8THREADS_H_
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#define V8_V8THREADS_H_
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#include "src/isolate.h"
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namespace v8 {
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namespace internal {
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class RootVisitor;
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class ThreadLocalTop;
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class ThreadState {
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public:
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// Returns nullptr after the last one.
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ThreadState* Next();
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enum List {FREE_LIST, IN_USE_LIST};
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void LinkInto(List list);
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void Unlink();
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// Id of thread.
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void set_id(ThreadId id) { id_ = id; }
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ThreadId id() { return id_; }
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// Should the thread be terminated when it is restored?
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bool terminate_on_restore() { return terminate_on_restore_; }
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void set_terminate_on_restore(bool terminate_on_restore) {
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terminate_on_restore_ = terminate_on_restore;
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}
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// Get data area for archiving a thread.
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char* data() { return data_; }
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private:
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explicit ThreadState(ThreadManager* thread_manager);
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~ThreadState();
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void AllocateSpace();
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ThreadId id_;
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bool terminate_on_restore_;
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char* data_;
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ThreadState* next_;
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ThreadState* previous_;
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ThreadManager* thread_manager_;
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friend class ThreadManager;
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};
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class ThreadVisitor {
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public:
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// ThreadLocalTop may be only available during this call.
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virtual void VisitThread(Isolate* isolate, ThreadLocalTop* top) = 0;
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protected:
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virtual ~ThreadVisitor() = default;
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};
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class ThreadManager {
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public:
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void Lock();
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void Unlock();
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void InitThread(const ExecutionAccess&);
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void ArchiveThread();
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bool RestoreThread();
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void FreeThreadResources();
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bool IsArchived();
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void Iterate(RootVisitor* v);
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void IterateArchivedThreads(ThreadVisitor* v);
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bool IsLockedByCurrentThread() {
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return mutex_owner_.Equals(ThreadId::Current());
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}
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ThreadId CurrentId();
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void TerminateExecution(ThreadId thread_id);
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// Iterate over in-use states.
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ThreadState* FirstThreadStateInUse();
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ThreadState* GetFreeThreadState();
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private:
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explicit ThreadManager(Isolate* isolate);
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~ThreadManager();
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void DeleteThreadStateList(ThreadState* anchor);
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void EagerlyArchiveThread();
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base::Mutex mutex_;
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ThreadId mutex_owner_;
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ThreadId lazily_archived_thread_;
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ThreadState* lazily_archived_thread_state_;
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// In the following two lists there is always at least one object on the list.
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// The first object is a flying anchor that is only there to simplify linking
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// and unlinking.
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// Head of linked list of free states.
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ThreadState* free_anchor_;
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// Head of linked list of states in use.
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ThreadState* in_use_anchor_;
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Isolate* isolate_;
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friend class Isolate;
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friend class ThreadState;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_V8THREADS_H_
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