1 files changed, 150 insertions, 0 deletions
diff --git a/src/VBox/Runtime/testcase/tstRTTime.cpp b/src/VBox/Runtime/testcase/tstRTTime.cpp
new file mode 100644
index 00000000..fabdef91
--- /dev/null
+++ b/src/VBox/Runtime/testcase/tstRTTime.cpp
@@ -0,0 +1,150 @@
+/* $Id: tstRTTime.cpp $ */
+/** @file
+ * IPRT Testcase - Simple RTTime tests (requires GIP).
+ */
+
+/*
+ * Copyright (C) 2006-2023 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/time.h>
+
+#include <iprt/errcore.h>
+#include <iprt/initterm.h>
+#include <iprt/message.h>
+#include <iprt/test.h>
+#include <iprt/thread.h>
+
+int main()
+{
+    /*
+     * Init.
+     */
+    RTTEST hTest;
+    RTEXITCODE rcExit = RTTestInitExAndCreate(0, NULL, RTR3INIT_FLAGS_SUPLIB, "tstRTTime", &hTest);
+    if (rcExit != RTEXITCODE_SUCCESS)
+        return rcExit;
+    RTTestBanner(hTest);
+
+    /*
+     * RTNanoTimeTS() shall never return something which
+     * is less or equal to the return of the previous call.
+     */
+
+    /* Take down the start time of both sources, try get them w/o being rescheduled. */
+    RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
+    uint64_t u64RTStartTS = RTTimeNanoTS();
+    uint64_t u64OSStartTS = RTTimeSystemNanoTS();
+    uint64_t const cNsMaxTolerance = 256 * RT_NS_1US;
+    for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTStartTS > cNsMaxTolerance; cTries++)
+    {
+        RTThreadYield();
+        u64RTStartTS = RTTimeNanoTS();
+        u64OSStartTS = RTTimeSystemNanoTS();
+    }
+
+    /* Test loop. */
+    uint32_t i;
+    uint64_t u64Prev = RTTimeNanoTS();
+    for (i = 0; i < 100*_1M; i++)
+    {
+        uint64_t u64 = RTTimeNanoTS();
+        if (u64 <= u64Prev)
+        {
+            /** @todo wrapping detection. */
+            RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx (1)\n", i, u64, u64Prev);
+            if (RTTestErrorCount(hTest) >= 256)
+                break;
+            RTThreadYield();
+            u64 = RTTimeNanoTS();
+        }
+        else if (u64 - u64Prev > 1000000000 /* 1sec */)
+        {
+            RTTestFailed(hTest, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
+            if (RTTestErrorCount(hTest) >= 256)
+                break;
+            RTThreadYield();
+            u64 = RTTimeNanoTS();
+        }
+        if (!(i & (_1M*2 - 1)))
+        {
+            RTTestPrintf(hTest, RTTESTLVL_INFO, "i=%#010x u64=%#llx u64Prev=%#llx delta=%lld\n", i, u64, u64Prev, u64 - u64Prev);
+            RTThreadYield();
+            u64 = RTTimeNanoTS();
+        }
+        u64Prev = u64;
+    }
+
+    /* Take down the stop time of both sources, again try get them w/o being rescheduled. */
+    RTTimeSystemNanoTS(); RTTimeNanoTS(); RTThreadYield();
+    uint64_t u64RTElapsedTS = RTTimeNanoTS();
+    uint64_t u64OSElapsedTS = RTTimeSystemNanoTS();
+    for (unsigned cTries = 0; cTries < 32 && RTTimeNanoTS() - u64RTElapsedTS > cNsMaxTolerance; cTries++)
+    {
+        RTThreadYield();
+        u64RTElapsedTS = RTTimeNanoTS();
+        u64OSElapsedTS = RTTimeSystemNanoTS();
+    }
+    u64RTElapsedTS -= u64RTStartTS;
+    u64OSElapsedTS -= u64OSStartTS;
+
+    /* Check the runtime difference between the two sources. */
+    int64_t i64Diff = u64OSElapsedTS >= u64RTElapsedTS ? u64OSElapsedTS - u64RTElapsedTS : u64RTElapsedTS - u64OSElapsedTS;
+    if (i64Diff > (int64_t)(RT_MAX(u64OSElapsedTS / 1000, cNsMaxTolerance)))
+        RTTestFailed(hTest, "total time differs too much! u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
+                     u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
+    else
+    {
+        if (u64OSElapsedTS >= u64RTElapsedTS)
+            RTTestValue(hTest, "Total time delta", u64OSElapsedTS - u64RTElapsedTS, RTTESTUNIT_NS);
+        else
+            RTTestValue(hTest, "Total time delta", u64RTElapsedTS - u64OSElapsedTS, RTTESTUNIT_NS);
+        RTTestPrintf(hTest, RTTESTLVL_INFO, "total time difference: u64OSElapsedTS=%#llx u64RTElapsedTS=%#llx delta=%lld\n",
+                     u64OSElapsedTS, u64RTElapsedTS, u64OSElapsedTS - u64RTElapsedTS);
+    }
+
+    /* Report debug details: */
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) /** @todo This isn't really x86 or AMD64 specific... */
+    RTTestValue(hTest, "RTTimeDbgSteps",        RTTimeDbgSteps(),                           RTTESTUNIT_OCCURRENCES);
+    RTTestValue(hTest, "RTTimeDbgSteps pp",     ((uint64_t)RTTimeDbgSteps() * 1000) / i,    RTTESTUNIT_PP1K);
+    RTTestValue(hTest, "RTTimeDbgExpired",      RTTimeDbgExpired(),                         RTTESTUNIT_OCCURRENCES);
+    RTTestValue(hTest, "RTTimeDbgExpired pp",   ((uint64_t)RTTimeDbgExpired() * 1000) / i,  RTTESTUNIT_PP1K);
+    RTTestValue(hTest, "RTTimeDbgBad",          RTTimeDbgBad(),                             RTTESTUNIT_OCCURRENCES);
+    RTTestValue(hTest, "RTTimeDbgBad pp",       ((uint64_t)RTTimeDbgBad() * 1000) / i,      RTTESTUNIT_PP1K);
+    RTTestValue(hTest, "RTTimeDbgRaces",        RTTimeDbgRaces(),                           RTTESTUNIT_OCCURRENCES);
+    RTTestValue(hTest, "RTTimeDbgRaces pp",     ((uint64_t)RTTimeDbgRaces() * 1000) / i,    RTTESTUNIT_PP1K);
+#endif
+
+    return RTTestSummaryAndDestroy(hTest);
+}