GN threading refactor

tools/gn/scheduler.h

 // Copyright (c) 2013 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.
 
 #ifndef TOOLS_GN_SCHEDULER_H_
 #define TOOLS_GN_SCHEDULER_H_
 
 #include "base/atomic_ref_count.h"
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
@@ skipping 22 matching lines @@
   void set_verbose_logging(bool v) { verbose_logging_ = v; }
 
   // TODO(brettw) data race on this access (benign?).
   bool is_failed() const { return is_failed_; }
 
   void Log(const std::string& verb, const std::string& msg);
   void FailWithError(const Err& err);
 
   void ScheduleWork(const base::Closure& work);
 
-  void ScheduleTargetFileWrite(const Target* target);
+  void Shutdown();
 
   // Declares that the given file was read and affected the build output.
   //
   // TODO(brettw) this is global rather than per-BuildSettings. If we
   // start using >1 build settings, then we probably want this to take a
   // BuildSettings object so we know the depdency on a per-build basis.
   void AddGenDependency(const base::FilePath& file);
   std::vector<base::FilePath> GetGenDependencies() const;
 
   // We maintain a count of the things we need to do that works like a
@@ skipping 18 matching lines @@
 
   base::RunLoop runner_;
 
   bool verbose_logging_;
 
   base::AtomicRefCount work_count_;
 
   mutable base::Lock lock_;
   bool is_failed_;
 
+  // Used to track whether the worker pool has been shutdown. This is necessary
+  // to clean up after tests that make a scheduler but don't run the message
+  // loop.
+  bool has_been_shutdown_;
+
   // Additional input dependencies. Protected by the lock.
   std::vector<base::FilePath> gen_dependencies_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 extern Scheduler* g_scheduler;
 
 #endif  // TOOLS_GN_SCHEDULER_H_