Move things round a bit.

1 files changed, 101 insertions, 0 deletions

diff --git a/src/lib/job_manager.cc b/src/lib/job_manager.cc
new file mode 100644
index 000000000..dd7c62c31
--- /dev/null
+++ b/src/lib/job_manager.cc
@@ -0,0 +1,101 @@
+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/** @file  src/job_manager.cc
+ *  @brief A simple scheduler for jobs.
+ */
+
+#include <iostream>
+#include <boost/thread.hpp>
+#include "job_manager.h"
+#include "job.h"
+
+using namespace std;
+using namespace boost;
+
+JobManager* JobManager::_instance = 0;
+
+JobManager::JobManager ()
+{
+	boost::thread (boost::bind (&JobManager::scheduler, this));
+}
+
+void
+JobManager::add (shared_ptr<Job> j)
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	
+	_jobs.push_back (j);
+}
+
+list<shared_ptr<Job> >
+JobManager::get () const
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	
+	return _jobs;
+}
+
+bool
+JobManager::work_to_do () const
+{
+	boost::mutex::scoped_lock lm (_mutex);
+	list<shared_ptr<Job> >::const_iterator i = _jobs.begin();
+	while (i != _jobs.end() && (*i)->finished()) {
+		++i;
+	}
+
+	return i != _jobs.end ();
+}
+
+void
+JobManager::scheduler ()
+{
+	while (1) {
+		{
+			boost::mutex::scoped_lock lm (_mutex);
+			int running = 0;
+			shared_ptr<Job> first_new;
+			for (list<shared_ptr<Job> >::iterator i = _jobs.begin(); i != _jobs.end(); ++i) {
+				if ((*i)->running ()) {
+					++running;
+				} else if (!(*i)->finished () && first_new == 0) {
+					first_new = *i;
+				}
+
+				if (running == 0 && first_new) {
+					first_new->start ();
+					break;
+				}
+			}
+		}
+
+		sleep (1);
+	}
+}
+
+JobManager *
+JobManager::instance ()
+{
+	if (_instance == 0) {
+		_instance = new JobManager ();
+	}
+
+	return _instance;
+}