Do not rely on uniquiness of pthread_t

src/v8.cc

 // 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 45 matching lines @@
 
   // The current thread may not yet had entered an isolate to run.
   // Note the Isolate::Current() may be non-null because for various
   // initialization purposes an initializing thread may be assigned an isolate
   // but not actually enter it.
   if (i::Isolate::CurrentPerIsolateThreadData() == NULL) {
     i::Isolate::EnterDefaultIsolate();
   }
 
   ASSERT(i::Isolate::CurrentPerIsolateThreadData() != NULL);
-  ASSERT(i::Isolate::CurrentPerIsolateThreadData()->thread_id() ==
-         i::Thread::GetThreadLocalInt(i::Isolate::thread_id_key()));
+  ASSERT(i::Isolate::CurrentPerIsolateThreadData()->thread_id().Equals(
+           i::ThreadId::Current()));
   ASSERT(i::Isolate::CurrentPerIsolateThreadData()->isolate() ==
          i::Isolate::Current());
 
   if (IsDead()) return false;
 
   Isolate* isolate = Isolate::Current();
   if (isolate->IsInitialized()) return true;
 
   is_running_ = true;
   has_been_setup_ = true;
@@ skipping 124 matching lines @@
   CPU::Setup();
   if (!CPU::SupportsCrankshaft()) {
     use_crankshaft_ = false;
   }
 
   // Peephole optimization might interfere with deoptimization.
   FLAG_peephole_optimization = !use_crankshaft_;
 }
 
 } }  // namespace v8::internal