Access thread instance in posix platform using NoBarrier_Load and NoBarrier_Store.

src/platform-posix.cc

 // Copyright 2012 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 597 matching lines @@
         0, 0, 0);
 #endif
 }
 
 
 static void* ThreadEntry(void* arg) {
   Thread* thread = reinterpret_cast<Thread*>(arg);
   // This is also initialized by the first argument to pthread_create() but we
   // don't know which thread will run first (the original thread or the new
   // one) so we initialize it here too.
-  thread->data()->thread_ = pthread_self();
+  NoBarrier_Store(reinterpret_cast<AtomicWord*>(&thread->data()->thread_),
+                  pthread_self());
   SetThreadName(thread->name());
-  ASSERT(thread->data()->thread_ != kNoThread);
+  ASSERT(static_cast<pthread_t>(
+      NoBarrier_Load(reinterpret_cast<AtomicWord*>(
+          &thread->data()->thread_))) != kNoThread);
   thread->NotifyStartedAndRun();
   return NULL;
 }
 
 
 void Thread::set_name(const char* name) {
   strncpy(name_, name, sizeof(name_));
   name_[sizeof(name_) - 1] = '\0';
 }
 
 
 void Thread::Start() {
   int result;
   pthread_attr_t attr;
   memset(&attr, 0, sizeof(attr));
   result = pthread_attr_init(&attr);
   ASSERT_EQ(0, result);
   // Native client uses default stack size.
 #if !V8_OS_NACL
   if (stack_size_ > 0) {
     result = pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
     ASSERT_EQ(0, result);
   }
 #endif
   result = pthread_create(&data_->thread_, &attr, ThreadEntry, this);
   ASSERT_EQ(0, result);
   result = pthread_attr_destroy(&attr);
   ASSERT_EQ(0, result);
-  ASSERT(data_->thread_ != kNoThread);
+  ASSERT(static_cast<pthread_t>(
+      NoBarrier_Load(reinterpret_cast<AtomicWord*>(
+          &data_->thread_))) != kNoThread);
   USE(result);
 }
 
 
 void Thread::Join() {
   pthread_join(data_->thread_, NULL);
 }
 
 
 void Thread::YieldCPU() {
@@ skipping 121 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   ASSERT_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::internal