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             : #include "src/base/macros.h"
       9             : 
      10             : namespace v8 {
      11             : namespace internal {
      12             : 
      13             : // Platform-independent, reliable thread identifier.
      14             : class ThreadId {
      15             :  public:
      16             :   // Creates an invalid ThreadId.
      17             :   constexpr ThreadId() noexcept : ThreadId(kInvalidId) {}
      18             : 
      19      339681 :   bool operator==(const ThreadId& other) const { return id_ == other.id_; }
      20             :   bool operator!=(const ThreadId& other) const { return id_ != other.id_; }
      21             : 
      22             :   // Checks whether this ThreadId refers to any thread.
      23       39868 :   bool IsValid() const { return id_ != kInvalidId; }
      24             : 
      25             :   // Converts ThreadId to an integer representation.
      26      438208 :   constexpr int ToInteger() const { return id_; }
      27             : 
      28             :   // Returns ThreadId for current thread if it exists or invalid id.
      29             :   static ThreadId TryGetCurrent();
      30             : 
      31             :   // Returns ThreadId for current thread.
      32      684245 :   static ThreadId Current() { return ThreadId(GetCurrentThreadId()); }
      33             : 
      34             :   // Returns invalid ThreadId (guaranteed not to be equal to any thread).
      35             :   static constexpr ThreadId Invalid() { return ThreadId(kInvalidId); }
      36             : 
      37             :   // Converts ThreadId to an integer representation
      38             :   // (required for public API: V8::V8::TerminateExecution).
      39             :   static constexpr ThreadId FromInteger(int id) { return ThreadId(id); }
      40             : 
      41             :  private:
      42             :   static constexpr int kInvalidId = -1;
      43             : 
      44       63426 :   explicit constexpr ThreadId(int id) noexcept : id_(id) {}
      45             : 
      46             :   V8_EXPORT_PRIVATE static int GetCurrentThreadId();
      47             : 
      48             :   int id_;
      49             : };
      50             : 
      51             : }  // namespace internal
      52             : }  // namespace v8
      53             : 
      54             : #endif  // V8_THREAD_ID_H_