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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_THREAD_ID_H_
#define V8_THREAD_ID_H_
#include "src/base/atomicops.h"
namespace v8 {
namespace internal {
// Platform-independent, reliable thread identifier.
class ThreadId {
public:
// Creates an invalid ThreadId.
ThreadId() { base::Relaxed_Store(&id_, kInvalidId); }
ThreadId& operator=(const ThreadId& other) V8_NOEXCEPT {
base::Relaxed_Store(&id_, base::Relaxed_Load(&other.id_));
return *this;
}
bool operator==(const ThreadId& other) const { return Equals(other); }
// 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 ThreadId Invalid() { return ThreadId(kInvalidId); }
// Compares ThreadIds for equality.
V8_INLINE bool Equals(const ThreadId& other) const {
return base::Relaxed_Load(&id_) == base::Relaxed_Load(&other.id_);
}
// Checks whether this ThreadId refers to any thread.
V8_INLINE bool IsValid() const {
return base::Relaxed_Load(&id_) != kInvalidId;
}
// Converts ThreadId to an integer representation
// (required for public API: V8::V8::GetCurrentThreadId).
int ToInteger() const { return static_cast<int>(base::Relaxed_Load(&id_)); }
// Converts ThreadId to an integer representation
// (required for public API: V8::V8::TerminateExecution).
static ThreadId FromInteger(int id) { return ThreadId(id); }
private:
static const int kInvalidId = -1;
explicit ThreadId(int id) { base::Relaxed_Store(&id_, id); }
static int AllocateThreadId() {
int new_id = base::Relaxed_AtomicIncrement(&highest_thread_id_, 1);
return new_id;
}
static int GetCurrentThreadId();
base::Atomic32 id_;
static base::Atomic32 highest_thread_id_;
};
} // namespace internal
} // namespace v8
#endif // V8_THREAD_ID_H_
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