* Copyright 2005-2009, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include <Referenceable.h>
#include <stdio.h>
#include <OS.h>
#if defined(TRACE_REFERENCEABLE) && defined(_KERNEL_MODE)
# include <tracing.h>
# define TRACE(x, ...) ktrace_printf(x, __VA_ARGS__);
#else
# define TRACE(x, ...)
#endif
BReferenceable::BReferenceable()
:
fReferenceCount(1)
{
}
BReferenceable::~BReferenceable()
{
#if !defined(_BOOT_MODE)
if (fReferenceCount != 0 && fReferenceCount != 1) {
char message[256];
snprintf(message, sizeof(message), "deleting referenceable object %p with "
"reference count (%" B_PRId32 ")", this, fReferenceCount);
debugger(message);
}
#endif
}
int32
BReferenceable::AcquireReference()
{
const int32 previousReferenceCount = atomic_add(&fReferenceCount, 1);
if (previousReferenceCount == 0)
FirstReferenceAcquired();
#if !defined(_BOOT_MODE)
if (previousReferenceCount < 0)
debugger("reference count is/was negative");
#endif
TRACE("%p: acquire %ld\n", this, fReferenceCount);
return previousReferenceCount;
}
int32
BReferenceable::ReleaseReference()
{
const int32 previousReferenceCount = atomic_add(&fReferenceCount, -1);
TRACE("%p: release %ld\n", this, fReferenceCount);
if (previousReferenceCount == 1)
LastReferenceReleased();
#if !defined(_BOOT_MODE)
if (previousReferenceCount <= 0)
debugger("reference count is negative");
#endif
return previousReferenceCount;
}
void
BReferenceable::FirstReferenceAcquired()
{
}
void
BReferenceable::LastReferenceReleased()
{
delete this;
}
