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// Copyright 2018 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_EXECUTION_THREAD_ID_H_
#define V8_EXECUTION_THREAD_ID_H_
#include "src/base/macros.h"
namespace v8 {
namespace internal {
// Platform-independent, reliable thread identifier.
class ThreadId {
public:
// Creates an invalid ThreadId.
constexpr ThreadId() noexcept : ThreadId(kInvalidId) {}
bool operator==(const ThreadId& other) const { return id_ == other.id_; }
bool operator!=(const ThreadId& other) const { return id_ != other.id_; }
// Checks whether this ThreadId refers to any thread.
bool IsValid() const { return id_ != kInvalidId; }
// Converts ThreadId to an integer representation.
constexpr int ToInteger() const { return id_; }
// Returns ThreadId for current thread if it exists or invalid id.
static ThreadId TryGetCurrent();
// Returns ThreadId for current thread.
static ThreadId Current() { return ThreadId(GetCurrentThreadId()); }
// Returns invalid ThreadId (guaranteed not to be equal to any thread).
static constexpr ThreadId Invalid() { return ThreadId(kInvalidId); }
// Converts ThreadId to an integer representation
// (required for public API: V8::V8::TerminateExecution).
static constexpr ThreadId FromInteger(int id) { return ThreadId(id); }
private:
static constexpr int kInvalidId = -1;
explicit constexpr ThreadId(int id) noexcept : id_(id) {}
V8_EXPORT_PRIVATE static int GetCurrentThreadId();
int id_;
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_THREAD_ID_H_