- Fix try lock on Lion.

vm/thread_macos.cc

 // Copyright (c) 2011, 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 <sys/errno.h>
 
 #include "vm/thread.h"
 
 #include "vm/assert.h"
 
@@ skipping 108 matching lines @@
   // Specifically check for dead lock to help debugging.
   ASSERT(result != EDEADLK);
   ASSERT(result == 0);  // Verify no other errors.
   // TODO(iposva): Do we need to track lock owners?
 }
 
 
 bool Mutex::TryLock() {
   int result = pthread_mutex_trylock(data_.mutex());
   // Return false if the lock is busy and locking failed.
-  if (result == EBUSY) {
+  if ((result == EBUSY) || (result == EDEADLK)) {
     return false;
   }
   ASSERT(result == 0);  // Verify no other errors.
   // TODO(iposva): Do we need to track lock owners?
   return true;
 }
 
 
 void Mutex::Unlock() {
   // TODO(iposva): Do we need to track lock owners?
@@ skipping 80 matching lines @@
 }
 
 
 void Monitor::NotifyAll() {
   // TODO(iposva): Do we need to track lock owners?
   int result = pthread_cond_broadcast(data_.cond());
   VALIDATE_PTHREAD_RESULT(result);
 }
 
 }  // namespace dart