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// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include <config.h>
#include <ucommon/export.h>
#include <ucommon/atomic.h>
#include <ucommon/thread.h>
using namespace UCOMMON_NAMESPACE;
atomic::counter::counter(long init)
{
value = init;
}
atomic::spinlock::spinlock()
{
value = 0;
}
#ifdef HAVE_GCC_ATOMICS
long atomic::counter::operator++()
{
return __sync_add_and_fetch(&value, 1);
}
long atomic::counter::operator--()
{
return __sync_sub_and_fetch(&value, 1);
}
long atomic::counter::operator+=(long change)
{
return __sync_add_and_fetch(&value, change);
}
long atomic::counter::operator-=(long change)
{
return __sync_sub_and_fetch(&value, change);
}
bool atomic::spinlock::acquire(void)
{
// if not locked by another already, then we acquired it...
return (__sync_lock_test_and_set(&value, 1) == 0);
}
void atomic::spinlock::release(void)
{
__sync_lock_release(&value);
}
#else
#define SIMULATED true
long atomic::counter::operator++()
{
long rval;
Mutex::protect((void *)&value);
rval = (long)(++value);
Mutex::release((void *)&value);
return rval;
}
long atomic::counter::operator--()
{
long rval;
Mutex::protect((void *)&value);
rval = (long)(--value);
Mutex::release((void *)&value);
return rval;
}
long atomic::counter::operator+=(long change)
{
long rval;
Mutex::protect((void *)&value);
rval = (long)(value += change);
Mutex::release((void *)&value);
return rval;
}
long atomic::counter::operator-=(long change)
{
long rval;
Mutex::protect((void *)&value);
rval = (long)(value -= change);
Mutex::release((void *)&value);
return rval;
}
bool atomic::spinlock::acquire(void)
{
bool rtn = true;
Mutex::protect((void *)&value);
if(value == 1)
rtn = false;
else
value = 1;
Mutex::release((void *)&value);
return rtn;
}
void atomic::spinlock::release(void)
{
Mutex::protect((void *)&value);
value = 0;
Mutex::release((void *)&value);
}
#endif
#ifdef SIMULATED
const bool atomic::simulated = true;
#else
const bool atomic::simulated = false;
#endif
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