1
0
Fork 0
mirror of https://gitlab.com/sortix/sortix.git synced 2023-02-13 20:55:38 -05:00
sortix--sortix/sortix/refcount.cpp
Jonas 'Sortie' Termansen 1444683ea8 Refactor kernel VFS.
Note: This is an incompatible ABI change.
2013-12-17 14:30:24 +01:00

66 lines
1.7 KiB
C++

/*******************************************************************************
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.
*******************************************************************************/
#include <sortix/kernel/platform.h>
#include <sortix/kernel/kthread.h>
#include <sortix/kernel/refcount.h>
#include <assert.h>
namespace Sortix {
Refcountable::Refcountable()
{
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()
{
ScopedLock lock(&reflock);
refcount++;
}
void Refcountable::Unref_Renamed()
{
assert(!being_deleted);
kthread_mutex_lock(&reflock);
assert(refcount);
bool deleteme = !refcount || !--refcount;
kthread_mutex_unlock(&reflock);
if ( deleteme )
{
being_deleted = true;
delete this;
}
}
} // namespace Sortix