jdk

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/*
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 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/os.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/spinYield.hpp"
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#include "unittest.hpp"
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// Some basic tests of SpinYield, using comparison of report output with
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// expected results to verify state.  This is all very hard-wired to the
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// current implementation of SpinYield, esp. the report function.
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static void check_report(const SpinYield* spinner, const char* expected) {
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  char buffer[100];
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  stringStream s(buffer, sizeof(buffer));
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  spinner->report(&s);
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  ASSERT_STREQ(expected, buffer);
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}
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TEST(SpinYield, no_waiting) {
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  SpinYield spinner;
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  check_report(&spinner, "no waiting");
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}
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TEST(SpinYield, one_wait) {
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  SpinYield spinner(100);
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  spinner.wait();
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  check_report(&spinner, os::is_MP() ? "spins = 1" : "yields = 1");
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}
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TEST(SpinYield, ten_waits) {
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  SpinYield spinner(100, 100);
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  for (unsigned i = 0; i < 10; ++i) {
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    spinner.wait();
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  }
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  check_report(&spinner, os::is_MP() ? "spins = 10" : "yields = 10");
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}
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TEST(SpinYield, two_yields) {
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  SpinYield spinner(0, 10);
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  spinner.wait();
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  spinner.wait();
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  check_report(&spinner, "yields = 2");
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}
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TEST_VM(SpinYield, one_sleep) {
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  SpinYield spinner(0, 0);
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  spinner.wait();
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  char buffer[100];
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  stringStream s(buffer, sizeof(buffer));
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  spinner.report(&s);
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  const char* expected = "sleep = ";
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  ASSERT_TRUE(strncmp(expected, buffer, strlen(expected)) == 0);
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}
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TEST_VM(SpinYield, one_spin_one_sleep) {
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  SpinYield spinner(1, 0);
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  spinner.wait();
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  spinner.wait();
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  char buffer[100];
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  stringStream s(buffer, sizeof(buffer));
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  spinner.report(&s);
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  const char* expected_MP = "spins = 1, sleep = ";
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  const char* expected_UP = "sleep = ";
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  const char* expected = os::is_MP() ? expected_MP : expected_UP;
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  ASSERT_TRUE(strncmp(expected, buffer, strlen(expected)) == 0);
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}
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