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sortix--sortix/kernel/refcount.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
This file is part of Sortix.
Sortix 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 3 of the License, or (at your option) any later
version.
Sortix 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
Sortix. If not, see <http://www.gnu.org/licenses/>.
refcount.cpp
A class that implements reference counting.
*******************************************************************************/
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#include <assert.h>
#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
#include <sortix/kernel/refcount.h>
namespace Sortix {
Refcountable::Refcountable()
{
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reflock = KTHREAD_MUTEX_INITIALIZER;
refcount = 0;
being_deleted = false;
}
Refcountable::~Refcountable()
{
// It's OK to be deleted if our refcount is 1, it won't mess with any
// other owners that might need us.
assert(refcount <= 1);
}
void Refcountable::Refer_Renamed()
{
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ScopedLock lock(&reflock);
refcount++;
}
void Refcountable::Unref_Renamed()
{
assert(!being_deleted);
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kthread_mutex_lock(&reflock);
assert(refcount);
bool deleteme = !refcount || !--refcount;
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kthread_mutex_unlock(&reflock);
if ( deleteme )
{
being_deleted = true;
delete this;
}
}
} // namespace Sortix