Fix the stack limits setting API so it is usable.

src/v8threads.cc

 // Copyright 2008 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 42 matching lines @@
   // Record that the Locker has been used at least once.
   active_ = true;
   // Get the big lock if necessary.
   if (!internal::ThreadManager::IsLockedByCurrentThread()) {
     internal::ThreadManager::Lock();
     has_lock_ = true;
     // This may be a locker within an unlocker in which case we have to
     // get the saved state for this thread and restore it.
     if (internal::ThreadManager::RestoreThread()) {
       top_level_ = false;
+    } else {
+      internal::ExecutionAccess access;
+      internal::StackGuard::ClearThread(access);
+      internal::StackGuard::InitThread(access);
     }
   }
   ASSERT(internal::ThreadManager::IsLockedByCurrentThread());
 
   // Make sure this thread is assigned a thread id.
   internal::ThreadManager::AssignId();
 }
 
 
 bool Locker::IsLocked() {
@@ skipping 61 matching lines @@
   ExecutionAccess access;
 
   // If there is another thread that was lazily archived then we have to really
   // archive it now.
   if (lazily_archived_thread_.IsValid()) {
     EagerlyArchiveThread();
   }
   ThreadState* state =
       reinterpret_cast<ThreadState*>(Thread::GetThreadLocal(thread_state_key));
   if (state == NULL) {
+    // This is a new thread.
+    StackGuard::InitThread(access);
     return false;
   }
   char* from = state->data();
   from = HandleScopeImplementer::RestoreThread(from);
   from = Top::RestoreThread(from);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   from = Debug::RestoreDebug(from);
 #endif
   from = StackGuard::RestoreStackGuard(from);
   from = RegExpStack::RestoreStack(from);
@@ skipping 271 matching lines @@
 // Acknowledge the preemption by the receiving thread.
 void ContextSwitcher::PreemptionReceived() {
   ASSERT(Locker::IsLocked());
   // There is currently no accounting being done for this. But could be in the
   // future, which is why we leave this in.
 }
 
 
 }  // namespace internal
 }  // namespace v8