Add WorkerPool::PostTaskAndReply and use in DHCP code.

base/threading/worker_pool_win.cc

 // Copyright (c) 2011 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/threading/worker_pool.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/task.h"
+#include "base/threading/post_task_and_reply_impl.h"
 #include "base/tracked_objects.h"
 
 namespace base {
 
 namespace {
 
 struct PendingTask {
   PendingTask(
       const tracked_objects::Location& posted_from,
       const base::Closure& task)
@@ skipping 43 matching lines @@
 
   if (!QueueUserWorkItem(WorkItemCallback, pending_task, flags)) {
     DLOG(ERROR) << "QueueUserWorkItem failed: " << GetLastError();
     delete pending_task;
     return false;
   }
 
   return true;
 }
 
+class PostTaskAndReplyWorkerPool : public PostTaskAndReplyImpl {
+public:
+  PostTaskAndReplyWorkerPool(bool task_is_slow) : task_is_slow_(task_is_slow) {
+  }
+
+  bool PostTask(const tracked_objects::Location& from_here,
+                const Closure& task) {
+    return WorkerPool::PostTask(from_here, task, task_is_slow_);
+  }
+
+private:
+  bool task_is_slow_;
+};
+
 }  // namespace
 
 bool WorkerPool::PostTask(const tracked_objects::Location& from_here,
                           Task* task, bool task_is_slow) {
   PendingTask* pending_task =
       new PendingTask(from_here,
                       base::Bind(&subtle::TaskClosureAdapter::Run,
                                  new subtle::TaskClosureAdapter(task)));
   return PostTaskInternal(pending_task, task_is_slow);
 }
 
 bool WorkerPool::PostTask(const tracked_objects::Location& from_here,
                           const base::Closure& task, bool task_is_slow) {
   PendingTask* pending_task = new PendingTask(from_here, task);
   return PostTaskInternal(pending_task, task_is_slow);
 }
 
+bool WorkerPool::PostTaskAndReply(const tracked_objects::Location& from_here,
+                                  const Closure& task,
+                                  const Closure& reply,
+                                  bool task_is_slow) {
+  return PostTaskAndReplyWorkerPool(task_is_slow).PostTaskAndReply(
+      from_here, task, reply);

[awong, 2011/10/05 17:27:01]

Yeah, if PostTaskAndReply were in a header file, this could just be

PostTAskAndReply relay = new PostTaskAndReply(from_here, task, reply);

return PostTask(from_here, base::Bind(&PostTaskAndReply::Run,
base::Unretained(relay), task_is_slow));

+}
+
 }  // namespace base