Mac build fix

base/waitable_event_posix.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/waitable_event.h"
 
 #include "base/condition_variable.h"
 #include "base/lock.h"
 #include "base/message_loop.h"
 
@@ skipping 284 matching lines @@
 // If return value == 0:
 //   The locks of the WaitableEvents have been taken in order and the Waiter has
 //   been enqueued in the wait-list of each. None of the WaitableEvents are
 //   currently signaled
 // else:
 //   None of the WaitableEvent locks are held. The Waiter has not been enqueued
 //   in any of them and the return value is the index of the first WaitableEvent
 //   which was signaled, from the end of the array.
 // -----------------------------------------------------------------------------
 // static
-unsigned WaitableEvent::EnqueueMany
+size_t WaitableEvent::EnqueueMany
     (std::pair<WaitableEvent*, size_t>* waitables,
-     unsigned count, Waiter* waiter) {
+     size_t count, Waiter* waiter) {
   if (!count)
     return 0;
 
   waitables[0].first->lock_.Acquire();
     if (waitables[0].first->signaled_) {
       if (!waitables[0].first->manual_reset_)
         waitables[0].first->signaled_ = false;
       waitables[0].first->lock_.Release();
       return count;
     }
 
-    const unsigned r = EnqueueMany(waitables + 1, count - 1, waiter);
+    const size_t r = EnqueueMany(waitables + 1, count - 1, waiter);
     if (r) {
       waitables[0].first->lock_.Release();
     } else {
       waitables[0].first->Enqueue(waiter);
     }
 
     return r;
 }
 
 // -----------------------------------------------------------------------------
@@ skipping 53 matching lines @@
       return true;
     }
   }
 
   return false;
 }
 
 // -----------------------------------------------------------------------------
 
 }  // namespace base