1 files changed, 82 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/log/tracedefault.cpp b/src/VBox/Runtime/common/log/tracedefault.cpp
new file mode 100644
index 00000000..12fce63a
--- /dev/null
+++ b/src/VBox/Runtime/common/log/tracedefault.cpp
@@ -0,0 +1,82 @@
+/* $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;
+}
+