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/*
Copyright (C) 2003 Stefan Westerfeld
stefan@space.twc.de
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "debug.h"
#include "soundserverstartup_impl.h"
#include <sys/time.h>
#include <time.h>
#include <cstdlib>
using namespace Arts;
SoundServerStartup_impl::SoundServerStartup_impl()
{
locked = false;
/*
* create a sane random seed, pseudo random is not enough for
* our purposes
*/
timeval tv;
gettimeofday(&tv, NULL);
int pid = getpid();
srand(tv.tv_sec);
srand(rand() + tv.tv_usec);
srand(rand() + pid);
}
SoundServerStartup_impl::~SoundServerStartup_impl()
{
if (locked)
unlock();
}
void SoundServerStartup_impl::cleanReference()
{
SoundServerStartup test = Reference("global:Arts_SoundServerStartup");
if(test.isNull())
Dispatcher::the()->globalComm().erase("Arts_SoundServerStartup");
}
void SoundServerStartup_impl::lock()
{
arts_return_if_fail (!locked);
while (!ObjectManager::the()->addGlobalReference(self(), "Arts_SoundServerStartup"))
{
arts_debug ("[artsd: %5d] parallel startup detected: sleeping",getpid());
/*
* if several instances of artsd are started at the same time,
* we don't want all of them to retry getting a reference at
* exactly the same moment ; thus we sleep for a random amount
* of time, rather than for exactly one second, if possible
*/
#ifdef HAVE_USLEEP
usleep((rand() % 700000) + 200000);
#else
sleep(1);
#endif
cleanReference();
}
locked = true;
arts_debug ("[artsd: %5d] SoundServerStartup --> got lock",getpid());
}
void SoundServerStartup_impl::unlock()
{
arts_return_if_fail (locked);
arts_debug ("[artsd: %5d] SoundServerStartup <-- released lock",getpid());
Dispatcher::the()->globalComm().erase("Arts_SoundServerStartup");
locked = false;
}
namespace Arts {
#ifndef __SUNPRO_CC
/* See bottom of simplesoundserver_impl.cc for the reason this is here. */
REGISTER_IMPLEMENTATION(SoundServerStartup_impl);
#endif
}
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