| 1 | /* $Id: tracedefault.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Tracebuffer common functions.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/trace.h>
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| 33 |
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| 34 | #include <iprt/asm.h>
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| 35 | #include <iprt/errcore.h>
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| 36 | #include <iprt/thread.h>
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| 37 |
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| 38 |
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| 39 | /*********************************************************************************************************************************
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| 40 | * Global Variables *
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| 41 | *********************************************************************************************************************************/
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| 42 | /** The default trace buffer handle. */
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| 43 | static RTTRACEBUF g_hDefaultTraceBuf = NIL_RTTRACEBUF;
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| 44 |
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| 45 |
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| 46 |
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| 47 | RTDECL(int) RTTraceSetDefaultBuf(RTTRACEBUF hTraceBuf)
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| 48 | {
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| 49 | /* Retain the new buffer. */
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| 50 | if (hTraceBuf != NIL_RTTRACEBUF)
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| 51 | {
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| 52 | uint32_t cRefs = RTTraceBufRetain(hTraceBuf);
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| 53 | if (cRefs >= _1M)
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| 54 | return VERR_INVALID_HANDLE;
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| 55 | }
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| 56 |
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| 57 | RTTRACEBUF hOldTraceBuf;
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| 58 | #ifdef IN_RC
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| 59 | hOldTraceBuf = (RTTRACEBUF)ASMAtomicXchgPtr((void **)&g_hDefaultTraceBuf, hTraceBuf);
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| 60 | #else
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| 61 | ASMAtomicXchgHandle(&g_hDefaultTraceBuf, hTraceBuf, &hOldTraceBuf);
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| 62 | #endif
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| 63 |
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| 64 | if ( hOldTraceBuf != NIL_RTTRACEBUF
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| 65 | && hOldTraceBuf != hTraceBuf)
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| 66 | {
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| 67 | /* Race prevention kludge. */
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| 68 | #ifndef IN_RC
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| 69 | RTThreadSleep(33);
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| 70 | #endif
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| 71 | RTTraceBufRelease(hOldTraceBuf);
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| 72 | }
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| 73 |
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| 74 | return VINF_SUCCESS;
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| 75 | }
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| 76 |
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| 77 |
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| 78 | RTDECL(RTTRACEBUF) RTTraceGetDefaultBuf(void)
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| 79 | {
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| 80 | return g_hDefaultTraceBuf;
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| 81 | }
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| 82 |
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