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66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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refcount.cpp
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A class that implements reference counting.
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*******************************************************************************/
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#include <sortix/kernel/platform.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/refcount.h>
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#include <assert.h>
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namespace Sortix {
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Refcountable::Refcountable()
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{
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reflock = KTHREAD_MUTEX_INITIALIZER;
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refcount = 0;
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being_deleted = false;
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}
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Refcountable::~Refcountable()
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{
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// It's OK to be deleted if our refcount is 1, it won't mess with any
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// other owners that might need us.
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assert(refcount <= 1);
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}
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void Refcountable::Refer_Renamed()
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{
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ScopedLock lock(&reflock);
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refcount++;
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}
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void Refcountable::Unref_Renamed()
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{
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assert(!being_deleted);
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kthread_mutex_lock(&reflock);
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assert(refcount);
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bool deleteme = !refcount || !--refcount;
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kthread_mutex_unlock(&reflock);
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if ( deleteme )
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{
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being_deleted = true;
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delete this;
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}
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}
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} // namespace Sortix
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