Add API to set thread name

runtime/vm/os_thread.cc

 // Copyright (c) 2015, 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.
 
 #include "vm/os_thread.h"
 
 #include "vm/atomic.h"
 #include "vm/lockers.h"
 #include "vm/log.h"
 #include "vm/thread_interrupter.h"
@@ skipping 45 matching lines @@
     if (Timeline::recorder() != NULL) {
       Timeline::recorder()->FinishBlock(timeline_block_);
     }
   }
   timeline_block_ = NULL;
   delete timeline_block_lock_;
   free(name_);
 }
 
 
+
+void OSThread::SetName(const char* name) {
+  MutexLocker ml(thread_list_lock_);
+  // Clear the old thread name.
+  if (name_ != NULL) {
+    free(name_);
+    name_ = NULL;
+  }
+  set_name(name);
+}
+
+
 void OSThread::DisableThreadInterrupts() {
   ASSERT(OSThread::Current() == this);
   AtomicOperations::FetchAndIncrement(&thread_interrupt_disabled_);
 }
 
 
 void OSThread::EnableThreadInterrupts() {
   ASSERT(OSThread::Current() == this);
   uintptr_t old =
       AtomicOperations::FetchAndDecrement(&thread_interrupt_disabled_);
@@ skipping 195 matching lines @@
 
 OSThread* OSThreadIterator::Next() {
   ASSERT(OSThread::thread_list_lock_ != NULL);
   ASSERT(OSThread::thread_list_lock_->IsOwnedByCurrentThread());
   OSThread* current = next_;
   next_ = next_->thread_list_next_;
   return current;
 }
 
 }  // namespace dart