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