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[msp430-binutils.git] / gold / workqueue-internal.h

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+// workqueue-internal.h -- internal work queue header for gold   -*- C++ -*-
+
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#ifndef GOLD_WORKQUEUE_INTERNAL_H
+#define GOLD_WORKQUEUE_INTERNAL_H
+
+#include <queue>
+#include <csignal>
+
+#include "gold-threads.h"
+#include "workqueue.h"
+
+// This is an internal header file for different gold workqueue
+// implementations.
+
+namespace gold
+{
+
+class Workqueue_thread;
+
+// The Workqueue_threader abstract class.  This is the interface used
+// by the general workqueue code to manage threads.
+
+class Workqueue_threader
+{
+ public:
+  Workqueue_threader(Workqueue* workqueue)
+    : workqueue_(workqueue)
+  { }
+  virtual ~Workqueue_threader()
+  { }
+
+  // Set the number of threads to use.  This is ignored when not using
+  // threads.
+  virtual void
+  set_thread_count(int) = 0;
+
+  // Return whether to cancel the current thread.
+  virtual bool
+  should_cancel_thread() = 0;
+
+ protected:
+  // Get the Workqueue.
+  Workqueue*
+  get_workqueue()
+  { return this->workqueue_; }
+
+ private:
+  // The Workqueue.
+  Workqueue* workqueue_;
+};
+
+// The threaded instantiation of Workqueue_threader.
+
+class Workqueue_threader_threadpool : public Workqueue_threader
+{
+ public:
+  Workqueue_threader_threadpool(Workqueue*);
+
+  ~Workqueue_threader_threadpool();
+
+  // Set the thread count.
+  void
+  set_thread_count(int);
+
+  // Return whether to cancel a thread.
+  bool
+  should_cancel_thread();
+
+  // Process all tasks.  This keeps running until told to cancel.
+  void
+  process(int thread_number)
+  { this->get_workqueue()->process(thread_number); }
+
+ private:
+  // This is set if we need to check the thread count.
+  volatile sig_atomic_t check_thread_count_;
+
+  // Lock for the remaining members.
+  Lock lock_;
+  // The number of threads we want to create.  This is set to zero
+  // when all threads should exit.
+  int desired_thread_count_;
+  // The number of threads currently running.
+  int threads_;
+};
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_WORKQUEUE_INTERNAL_H)