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diff --git a/src/VBox/Runtime/testcase/tstRTTls-1.cpp b/src/VBox/Runtime/testcase/tstRTTls-1.cpp
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+/* $Id: tstRTTls-1.cpp $ */
+/** @file
+ * IPRT Testcase - Thread Local Storage (TLS).
+ */
+
+/*
+ * Copyright (C) 2020-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/thread.h>
+
+#include <iprt/asm.h>
+#include <iprt/errcore.h>
+#include <iprt/test.h>
+#include <iprt/time.h>
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+static RTTEST g_hTest;
+static uint32_t volatile g_cDtorCalls = 0;
+
+/**
+ * @callback_method_impl{FNRTTLSDTOR}
+ */
+static DECLCALLBACK(void) testDtorCallback(void *pvValue)
+{
+ RTTEST_CHECK(g_hTest, pvValue != NULL);
+ ASMAtomicIncU32(&g_cDtorCalls);
+}
+
+
+static DECLCALLBACK(int) testDtorThread1(RTTHREAD hSelf, void *pvUser)
+{
+ RTTEST_CHECK_RC(g_hTest, RTTlsSet((RTTLS)pvUser, hSelf), VINF_SUCCESS);
+ return VINF_SUCCESS;
+}
+
+
+static void testDtor(void)
+{
+ RTTestISub("TLS Destructors");
+
+ g_cDtorCalls = 0;
+ RTTLS iTls;
+ int rc = RTTlsAllocEx(&iTls, testDtorCallback);
+ if (rc == VERR_NOT_SUPPORTED)
+ {
+ RTTestSkipped(g_hTest, "RTTlsAllocEx -> VERR_NOT_SUPPORTED");
+ return;
+ }
+ RTTESTI_CHECK_RC_RETV(rc, VINF_SUCCESS);
+
+ RTTHREAD ahThreads[16];
+ uint32_t cThreads = 0;
+ while (cThreads < RT_ELEMENTS(ahThreads))
+ {
+ RTTESTI_CHECK_RC_BREAK(RTThreadCreateF(&ahThreads[cThreads], testDtorThread1, (void *)iTls, 0, RTTHREADTYPE_DEFAULT,
+ RTTHREADFLAGS_WAITABLE, "dtor-%u", cThreads), VINF_SUCCESS);
+ cThreads++;
+ }
+ uint32_t const cExpectedDtorCalls = cThreads;
+
+ while (cThreads-- > 0)
+ RTTESTI_CHECK_RC(RTThreadWait(ahThreads[cThreads], RT_MS_30SEC, NULL), VINF_SUCCESS);
+
+ /* RTThreadWait will return while the native portition of the thread may
+ still be shutting down, so we need to fudge a little here. */
+ uint64_t const nsStart = RTTimeNanoTS();
+ RTMSINTERVAL nsSleep = 2;
+ while ( ASMAtomicReadU32(&g_cDtorCalls) != cExpectedDtorCalls
+ && RTTimeNanoTS() - nsStart < RT_NS_10SEC)
+ {
+ nsSleep = RT_MAX(nsSleep + 1, 128);
+ RTThreadSleep(nsSleep);
+ }
+
+ uint32_t cCalls = ASMAtomicReadU32(&g_cDtorCalls);
+ if (cCalls != cExpectedDtorCalls)
+ RTTestFailed(g_hTest, "%u dtor calls, expected %u\n", cCalls, cExpectedDtorCalls);
+
+ RTTESTI_CHECK_RC(RTTlsFree(iTls), VINF_SUCCESS);
+}
+
+
+int main()
+{
+ RTEXITCODE rcExit = RTTestInitAndCreate("tstRTStrCatCopy", &g_hTest);
+ if (rcExit != RTEXITCODE_SUCCESS)
+ return rcExit;
+
+ testDtor();
+
+ return RTTestSummaryAndDestroy(g_hTest);
+}
+