129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
// workqueue-internal.h -- internal work queue header for gold -*- C++ -*-
|
|
|
|
// Copyright 2006, 2007 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 "gold-threads.h"
|
|
#include "workqueue.h"
|
|
|
|
// This is an internal header file for different gold workqueue
|
|
// implementations.
|
|
|
|
namespace gold
|
|
{
|
|
|
|
class Workqueue_thread;
|
|
|
|
// The Workqueue_runner abstract class. This is the interface used by
|
|
// the general workqueue code to actually run a task.
|
|
|
|
class Workqueue_runner
|
|
{
|
|
public:
|
|
Workqueue_runner(Workqueue* workqueue)
|
|
: workqueue_(workqueue)
|
|
{ }
|
|
virtual ~Workqueue_runner()
|
|
{ }
|
|
|
|
// Run a task. This is always called in the main thread.
|
|
virtual void
|
|
run(Task*, Task_locker*) = 0;
|
|
|
|
// Set the number of threads to use. This is ignored when not using
|
|
// threads.
|
|
virtual void
|
|
set_thread_count(int) = 0;
|
|
|
|
protected:
|
|
// This is called by an implementation when a task is completed.
|
|
void completed(Task* t, Task_locker* tl)
|
|
{ this->workqueue_->completed(t, tl); }
|
|
|
|
Workqueue* get_workqueue() const
|
|
{ return this->workqueue_; }
|
|
|
|
private:
|
|
Workqueue* workqueue_;
|
|
};
|
|
|
|
// The threaded instantiation of Workqueue_runner.
|
|
|
|
class Workqueue_runner_threadpool : public Workqueue_runner
|
|
{
|
|
public:
|
|
Workqueue_runner_threadpool(Workqueue* workqueue);
|
|
|
|
~Workqueue_runner_threadpool();
|
|
|
|
void
|
|
run(Task*, Task_locker*);
|
|
|
|
void
|
|
set_thread_count(int);
|
|
|
|
private:
|
|
// This class can not be copied.
|
|
Workqueue_runner_threadpool(const Workqueue_runner_threadpool&);
|
|
Workqueue_runner_threadpool& operator=(const Workqueue_runner_threadpool&);
|
|
|
|
// Return the next Task and Task_locker to run. This returns false
|
|
// if the calling thread should simply exit.
|
|
bool
|
|
get_next(Task**, Task_locker**);
|
|
|
|
// This is called when the thread completes a task.
|
|
void
|
|
thread_completed(Task*, Task_locker*);
|
|
|
|
// The Workqueue_thread class calls functions from this and from the
|
|
// parent Workqueue_runner.
|
|
friend class Workqueue_thread;
|
|
|
|
// An entry on the queue of tasks to run.
|
|
typedef std::pair<Task*, Task_locker*> Task_queue_entry;
|
|
|
|
// A queue of tasks to run.
|
|
typedef std::queue<Task_queue_entry> Task_queue;
|
|
|
|
// The number of threads we want to create. This is only changed in
|
|
// the main thread or when only one thread is running. This is set
|
|
// to zero when all threads should exit.
|
|
int desired_thread_count_;
|
|
// A lock controlling access to the remaining fields.
|
|
Lock lock_;
|
|
// The number of threads we have created.
|
|
int actual_thread_count_;
|
|
// The number of threads which are running a task.
|
|
int running_thread_count_;
|
|
// A queue of tasks to run.
|
|
Task_queue task_queue_;
|
|
// A condition variable which signals when the task_queue_ changed.
|
|
Condvar task_queue_condvar_;
|
|
};
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_WORKQUEUE_INTERNAL_H)
|