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/*
* Copyright (c) 2012 Novell, Inc.
*
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as published
* by the Free Software Foundation.
*
* 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, contact Novell, Inc.
*
* To contact Novell about this file by physical or electronic mail, you may
* find current contact information at www.novell.com.
*/
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <snapper/Log.h>
#include <snapper/Comparison.h>
#include "MetaSnapper.h"
#include "Background.h"
Backgrounds backgrounds;
Backgrounds::Backgrounds()
{
}
Backgrounds::~Backgrounds()
{
thread.interrupt();
if (thread.joinable())
thread.join();
}
void
Backgrounds::add_task(MetaSnappers::iterator meta_snapper, Snapshots::const_iterator snapshot1,
Snapshots::const_iterator snapshot2)
{
if (thread.get_id() == boost::thread::id())
thread = boost::thread(boost::bind(&Backgrounds::worker, this));
boost::unique_lock<boost::mutex> lock(mutex);
tasks.push_back(Task(meta_snapper, snapshot1, snapshot2));
meta_snapper->inc_use_count();
lock.unlock();
condition.notify_one();
}
enum {
IOPRIO_CLASS_NONE,
IOPRIO_CLASS_RT,
IOPRIO_CLASS_BE,
IOPRIO_CLASS_IDLE,
};
enum {
IOPRIO_WHO_PROCESS = 1,
IOPRIO_WHO_PGRP,
IOPRIO_WHO_USER,
};
#define IOPRIO_CLASS_SHIFT (13)
#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
#define IOPRIO_PRIO_VALUE(ioclass, data) (((ioclass) << IOPRIO_CLASS_SHIFT) | data)
void
Backgrounds::worker()
{
/* According to POSIX threads have the same nice value (see pthreads(7))
but with linux 3.4 and glibc 2.15 the value can be set per thread. */
pid_t tid = syscall(SYS_gettid);
int priority = 20;
if (setpriority(PRIO_PROCESS, tid, priority) != 0)
{
y2war("failed to set priority errno:" << errno);
}
int ioclass = IOPRIO_CLASS_IDLE;
int data = 0;
if (syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, tid, IOPRIO_PRIO_VALUE(ioclass, data)) != 0)
{
y2war("failed to set io-priority errno:" << errno);
}
try
{
while (true)
{
boost::unique_lock<boost::mutex> lock(mutex);
while (tasks.empty())
condition.wait(lock);
Task task = tasks.front();
lock.unlock();
Snapper* snapper = task.meta_snapper->getSnapper();
Comparison comparison(snapper, task.snapshot1, task.snapshot2);
task.meta_snapper->dec_use_count();
lock.lock();
tasks.pop_front();
lock.unlock();
}
}
catch (const boost::thread_interrupted&)
{
y2deb("worker interrupted");
}
}
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