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sortix--sortix/kernel/refcount.cpp

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/*
* Copyright (c) 2012 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* 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