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