Line data    Source code

       1             : // Copyright 2018 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_THREAD_ID_H_
       6             : #define V8_THREAD_ID_H_
       7             : 
       8             : namespace v8 {
       9             : namespace internal {
      10             : 
      11             : // Platform-independent, reliable thread identifier.
      12             : class ThreadId {
      13             :  public:
      14             :   // Creates an invalid ThreadId.
      15             :   constexpr ThreadId() noexcept : ThreadId(kInvalidId) {}
      16             : 
      17      337687 :   bool operator==(const ThreadId& other) const { return id_ == other.id_; }
      18             :   bool operator!=(const ThreadId& other) const { return id_ != other.id_; }
      19             : 
      20             :   // Checks whether this ThreadId refers to any thread.
      21       39855 :   bool IsValid() const { return id_ != kInvalidId; }
      22             : 
      23             :   // Converts ThreadId to an integer representation.
      24      434437 :   constexpr int ToInteger() const { return id_; }
      25             : 
      26             :   // Returns ThreadId for current thread if it exists or invalid id.
      27             :   static ThreadId TryGetCurrent();
      28             : 
      29             :   // Returns ThreadId for current thread.
      30      680455 :   static ThreadId Current() { return ThreadId(GetCurrentThreadId()); }
      31             : 
      32             :   // Returns invalid ThreadId (guaranteed not to be equal to any thread).
      33             :   static constexpr ThreadId Invalid() { return ThreadId(kInvalidId); }
      34             : 
      35             :   // Converts ThreadId to an integer representation
      36             :   // (required for public API: V8::V8::TerminateExecution).
      37             :   static constexpr ThreadId FromInteger(int id) { return ThreadId(id); }
      38             : 
      39             :  private:
      40             :   static constexpr int kInvalidId = -1;
      41             : 
      42       62534 :   explicit constexpr ThreadId(int id) noexcept : id_(id) {}
      43             : 
      44             :   static int GetCurrentThreadId();
      45             : 
      46             :   int id_;
      47             : };
      48             : 
      49             : }  // namespace internal
      50             : }  // namespace v8
      51             : 
      52             : #endif  // V8_THREAD_ID_H_