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/* $Id: tracedefault.cpp $ */
/** @file
* IPRT - Tracebuffer common functions.
*/
/*
* Copyright (C) 2011-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/trace.h>
#include <iprt/asm.h>
#include <iprt/errcore.h>
#include <iprt/thread.h>
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** The default trace buffer handle. */
static RTTRACEBUF g_hDefaultTraceBuf = NIL_RTTRACEBUF;
RTDECL(int) RTTraceSetDefaultBuf(RTTRACEBUF hTraceBuf)
{
/* Retain the new buffer. */
if (hTraceBuf != NIL_RTTRACEBUF)
{
uint32_t cRefs = RTTraceBufRetain(hTraceBuf);
if (cRefs >= _1M)
return VERR_INVALID_HANDLE;
}
RTTRACEBUF hOldTraceBuf;
#ifdef IN_RC
hOldTraceBuf = (RTTRACEBUF)ASMAtomicXchgPtr((void **)&g_hDefaultTraceBuf, hTraceBuf);
#else
ASMAtomicXchgHandle(&g_hDefaultTraceBuf, hTraceBuf, &hOldTraceBuf);
#endif
if ( hOldTraceBuf != NIL_RTTRACEBUF
&& hOldTraceBuf != hTraceBuf)
{
/* Race prevention kludge. */
#ifndef IN_RC
RTThreadSleep(33);
#endif
RTTraceBufRelease(hOldTraceBuf);
}
return VINF_SUCCESS;
}
RTDECL(RTTRACEBUF) RTTraceGetDefaultBuf(void)
{
return g_hDefaultTraceBuf;
}
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