VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/log/tracedefault.cpp@ 96407

Last change on this file since 96407 was 96407, checked in by vboxsync, 2 years ago

scm copyright and license note update

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.1 KB
Line 
1/* $Id: tracedefault.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2/** @file
3 * IPRT - Tracebuffer common functions.
4 */
5
6/*
7 * Copyright (C) 2011-2022 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "internal/iprt.h"
42#include <iprt/trace.h>
43
44#include <iprt/asm.h>
45#include <iprt/errcore.h>
46#include <iprt/thread.h>
47
48
49/*********************************************************************************************************************************
50* Global Variables *
51*********************************************************************************************************************************/
52/** The default trace buffer handle. */
53static RTTRACEBUF g_hDefaultTraceBuf = NIL_RTTRACEBUF;
54
55
56
57RTDECL(int) RTTraceSetDefaultBuf(RTTRACEBUF hTraceBuf)
58{
59 /* Retain the new buffer. */
60 if (hTraceBuf != NIL_RTTRACEBUF)
61 {
62 uint32_t cRefs = RTTraceBufRetain(hTraceBuf);
63 if (cRefs >= _1M)
64 return VERR_INVALID_HANDLE;
65 }
66
67 RTTRACEBUF hOldTraceBuf;
68#ifdef IN_RC
69 hOldTraceBuf = (RTTRACEBUF)ASMAtomicXchgPtr((void **)&g_hDefaultTraceBuf, hTraceBuf);
70#else
71 ASMAtomicXchgHandle(&g_hDefaultTraceBuf, hTraceBuf, &hOldTraceBuf);
72#endif
73
74 if ( hOldTraceBuf != NIL_RTTRACEBUF
75 && hOldTraceBuf != hTraceBuf)
76 {
77 /* Race prevention kludge. */
78#ifndef IN_RC
79 RTThreadSleep(33);
80#endif
81 RTTraceBufRelease(hOldTraceBuf);
82 }
83
84 return VINF_SUCCESS;
85}
86
87
88RTDECL(RTTRACEBUF) RTTraceGetDefaultBuf(void)
89{
90 return g_hDefaultTraceBuf;
91}
92
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