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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_V8THREADS_H_
#define V8_V8THREADS_H_
#include "src/isolate.h"
namespace v8 {
namespace internal {
class RootVisitor;
class ThreadLocalTop;
class ThreadState {
public:
// Returns nullptr after the last one.
ThreadState* Next();
enum List {FREE_LIST, IN_USE_LIST};
void LinkInto(List list);
void Unlink();
// Id of thread.
void set_id(ThreadId id) { id_ = id; }
ThreadId id() { return id_; }
// Should the thread be terminated when it is restored?
bool terminate_on_restore() { return terminate_on_restore_; }
void set_terminate_on_restore(bool terminate_on_restore) {
terminate_on_restore_ = terminate_on_restore;
}
// Get data area for archiving a thread.
char* data() { return data_; }
private:
explicit ThreadState(ThreadManager* thread_manager);
~ThreadState();
void AllocateSpace();
ThreadId id_;
bool terminate_on_restore_;
char* data_;
ThreadState* next_;
ThreadState* previous_;
ThreadManager* thread_manager_;
friend class ThreadManager;
};
class ThreadVisitor {
public:
// ThreadLocalTop may be only available during this call.
virtual void VisitThread(Isolate* isolate, ThreadLocalTop* top) = 0;
protected:
virtual ~ThreadVisitor() = default;
};
class ThreadManager {
public:
void Lock();
void Unlock();
void InitThread(const ExecutionAccess&);
void ArchiveThread();
bool RestoreThread();
void FreeThreadResources();
bool IsArchived();
void Iterate(RootVisitor* v);
void IterateArchivedThreads(ThreadVisitor* v);
bool IsLockedByCurrentThread() {
return mutex_owner_.Equals(ThreadId::Current());
}
ThreadId CurrentId();
void TerminateExecution(ThreadId thread_id);
// Iterate over in-use states.
ThreadState* FirstThreadStateInUse();
ThreadState* GetFreeThreadState();
private:
ThreadManager();
~ThreadManager();
void DeleteThreadStateList(ThreadState* anchor);
void EagerlyArchiveThread();
base::Mutex mutex_;
ThreadId mutex_owner_;
ThreadId lazily_archived_thread_;
ThreadState* lazily_archived_thread_state_;
// In the following two lists there is always at least one object on the list.
// The first object is a flying anchor that is only there to simplify linking
// and unlinking.
// Head of linked list of free states.
ThreadState* free_anchor_;
// Head of linked list of states in use.
ThreadState* in_use_anchor_;
Isolate* isolate_;
friend class Isolate;
friend class ThreadState;
};
} // namespace internal
} // namespace v8
#endif // V8_V8THREADS_H_
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