Copy the passed in name string into the os_thread structure and delete it in the destructor.

runtime/vm/os_thread.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OS_THREAD_H_
 #define VM_OS_THREAD_H_
 
 #include "platform/globals.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
@@ skipping 57 matching lines @@
     return trace_id_;
   }
 
   const char* name() const {
     return name_;
   }
 
   void set_name(const char* name) {
     ASSERT(OSThread::Current() == this);
     ASSERT(name_ == NULL);
-    name_ = name;
+    ASSERT(name != NULL);
+    name_ = strdup(name);
   }
 
   Mutex* timeline_block_lock() const {
     return timeline_block_lock_;
   }
 
   // Only safe to access when holding |timeline_block_lock_|.
   TimelineEventBlock* timeline_block() const {
     return timeline_block_;
   }
@@ skipping 106 matching lines @@
   static ThreadJoinId GetCurrentThreadJoinId();
   static OSThread* GetOSThreadFromThread(Thread* thread);
   static void AddThreadToList(OSThread* thread);
   static void RemoveThreadFromList(OSThread* thread);
 
   static ThreadLocalKey thread_key_;
 
   const ThreadId id_;
   const ThreadId join_id_;
   const ThreadId trace_id_;  // Used to interface with tracing tools.
-  const char* name_;  // A name for this thread.
+  char* name_;  // A name for this thread.
 
   Mutex* timeline_block_lock_;
   TimelineEventBlock* timeline_block_;
 
   // All |Thread|s are registered in the thread list.
   OSThread* thread_list_next_;
 
   uintptr_t thread_interrupt_disabled_;
   Log* log_;
   uword stack_base_;
@@ skipping 97 matching lines @@
 #endif  // defined(DEBUG)
 
   DISALLOW_COPY_AND_ASSIGN(Monitor);
 };
 
 
 }  // namespace dart
 
 
 #endif  // VM_OS_THREAD_H_