Do not rely on uniquiness of pthread_t

src/platform.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 336 matching lines @@
   bool Commit(void* address, size_t size, bool is_executable);
 
   // Uncommit real memory.  Returns whether the operation succeeded.
   bool Uncommit(void* address, size_t size);
 
  private:
   void* address_;  // Start address of the virtual memory.
   size_t size_;  // Size of the virtual memory.
 };
 
-
-// ----------------------------------------------------------------------------
-// ThreadHandle
-//
-// A ThreadHandle represents a thread identifier for a thread. The ThreadHandle
-// does not own the underlying os handle. Thread handles can be used for
-// refering to threads and testing equality.
-
-class ThreadHandle {
- public:
-  enum Kind { SELF, INVALID };
-  explicit ThreadHandle(Kind kind);
-
-  // Destructor.
-  ~ThreadHandle();
-
-  // Test for thread running.
-  bool IsSelf() const;
-
-  // Test for valid thread handle.
-  bool IsValid() const;
-
-  // Get platform-specific data.
-  class PlatformData;
-  PlatformData* thread_handle_data() { return data_; }
-
-  // Initialize the handle to kind
-  void Initialize(Kind kind);
-
- private:
-  PlatformData* data_;  // Captures platform dependent data.
-};
-
-
 // ----------------------------------------------------------------------------
 // Thread
 //
 // Thread objects are used for creating and running threads. When the start()
 // method is called the new thread starts running the run() method in the new
 // thread. The Thread object should not be deallocated before the thread has
 // terminated.
 
-class Thread: public ThreadHandle {
+class Thread {
  public:
   // Opaque data type for thread-local storage keys.
   // LOCAL_STORAGE_KEY_MIN_VALUE and LOCAL_STORAGE_KEY_MAX_VALUE are specified
   // to ensure that enumeration type has correct value range (see Issue 830 for
   // more details).
   enum LocalStorageKey {
     LOCAL_STORAGE_KEY_MIN_VALUE = kMinInt,
     LOCAL_STORAGE_KEY_MAX_VALUE = kMaxInt
   };
 
@@ skipping 51 matching lines @@
 #endif
 
   // A hint to the scheduler to let another thread run.
   static void YieldCPU();
 
   Isolate* isolate() const { return isolate_; }
 
   // The thread name length is limited to 16 based on Linux's implementation of
   // prctl().
   static const int kMaxThreadNameLength = 16;
+
+  class PlatformData;
+  PlatformData* data() { return data_; }
+
  private:
   void set_name(const char *name);
 
-  class PlatformData;
   PlatformData* data_;
+
   Isolate* isolate_;
   char name_[kMaxThreadNameLength];
   int stack_size_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 
 // ----------------------------------------------------------------------------
 // Mutex
@@ skipping 198 matching lines @@
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_