Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/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/message_loop/message_loop.h"
-#include "base/run_loop.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/sequenced_worker_pool.h"
-#include "tools/gn/input_file_manager.h"
-
-class Target;
-
-// Maintains the thread pool and error state.
-class Scheduler {
- public:
-  Scheduler();
-  ~Scheduler();
-
-  bool Run();
-
-  base::MessageLoop* main_loop() { return &main_loop_; }
-  base::SequencedWorkerPool* pool() { return pool_; }
-
-  InputFileManager* input_file_manager() { return input_file_manager_; }
-
-  bool verbose_logging() const { return verbose_logging_; }
-  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);
-
-  // 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 SourceFile& source_file);
-  std::vector<SourceFile> GetGenDependencies() const;
-
-  // We maintain a count of the things we need to do that works like a
-  // refcount. When this reaches 0, the program exits.
-  void IncrementWorkCount();
-  void DecrementWorkCount();
-
- private:
-  void LogOnMainThread(const std::string& verb, const std::string& msg);
-  void FailWithErrorOnMainThread(const Err& err);
-
-  void DoTargetFileWrite(const Target* target);
-
-  void DoWork(const base::Closure& closure);
-
-  void OnComplete();
-
-  base::MessageLoop main_loop_;
-  scoped_refptr<base::SequencedWorkerPool> pool_;
-
-  scoped_refptr<InputFileManager> input_file_manager_;
-
-  base::RunLoop runner_;
-
-  bool verbose_logging_;
-
-  base::AtomicRefCount work_count_;
-
-  mutable base::Lock lock_;
-  bool is_failed_;
-
-  // Additional input dependencies. Protected by the lock.
-  std::vector<SourceFile> gen_dependencies_;
-
-  DISALLOW_COPY_AND_ASSIGN(Scheduler);
-};
-
-extern Scheduler* g_scheduler;
-
-#endif  // TOOLS_GN_SCHEDULER_H_
-