1 | /* |
2 | * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 | * |
5 | * This code is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License version 2 only, as |
7 | * published by the Free Software Foundation. |
8 | * |
9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
12 | * version 2 for more details (a copy is included in the LICENSE file that |
13 | * accompanied this code). |
14 | * |
15 | * You should have received a copy of the GNU General Public License version |
16 | * 2 along with this work; if not, write to the Free Software Foundation, |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
18 | * |
19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
20 | * or visit www.oracle.com if you need additional information or have any |
21 | * questions. |
22 | * |
23 | */ |
24 | |
25 | #include "precompiled.hpp" |
26 | #include "runtime/os.hpp" |
27 | #include "utilities/ostream.hpp" |
28 | #include "utilities/spinYield.hpp" |
29 | #include "unittest.hpp" |
30 | |
31 | // Some basic tests of SpinYield, using comparison of report output with |
32 | // expected results to verify state. This is all very hard-wired to the |
33 | // current implementation of SpinYield, esp. the report function. |
34 | |
35 | static void check_report(const SpinYield* spinner, const char* expected) { |
36 | char buffer[100]; |
37 | stringStream s(buffer, sizeof(buffer)); |
38 | spinner->report(&s); |
39 | ASSERT_STREQ(expected, buffer); |
40 | } |
41 | |
42 | TEST(SpinYield, no_waiting) { |
43 | SpinYield spinner; |
44 | check_report(&spinner, "no waiting" ); |
45 | } |
46 | |
47 | TEST(SpinYield, one_wait) { |
48 | SpinYield spinner(100); |
49 | spinner.wait(); |
50 | check_report(&spinner, os::is_MP() ? "spins = 1" : "yields = 1" ); |
51 | } |
52 | |
53 | TEST(SpinYield, ten_waits) { |
54 | SpinYield spinner(100, 100); |
55 | for (unsigned i = 0; i < 10; ++i) { |
56 | spinner.wait(); |
57 | } |
58 | check_report(&spinner, os::is_MP() ? "spins = 10" : "yields = 10" ); |
59 | } |
60 | |
61 | TEST(SpinYield, two_yields) { |
62 | SpinYield spinner(0, 10); |
63 | spinner.wait(); |
64 | spinner.wait(); |
65 | check_report(&spinner, "yields = 2" ); |
66 | } |
67 | |
68 | TEST_VM(SpinYield, one_sleep) { |
69 | SpinYield spinner(0, 0); |
70 | spinner.wait(); |
71 | |
72 | char buffer[100]; |
73 | stringStream s(buffer, sizeof(buffer)); |
74 | spinner.report(&s); |
75 | |
76 | const char* expected = "sleep = " ; |
77 | ASSERT_TRUE(strncmp(expected, buffer, strlen(expected)) == 0); |
78 | } |
79 | |
80 | TEST_VM(SpinYield, one_spin_one_sleep) { |
81 | SpinYield spinner(1, 0); |
82 | spinner.wait(); |
83 | spinner.wait(); |
84 | |
85 | char buffer[100]; |
86 | stringStream s(buffer, sizeof(buffer)); |
87 | spinner.report(&s); |
88 | |
89 | const char* expected_MP = "spins = 1, sleep = " ; |
90 | const char* expected_UP = "sleep = " ; |
91 | const char* expected = os::is_MP() ? expected_MP : expected_UP; |
92 | ASSERT_TRUE(strncmp(expected, buffer, strlen(expected)) == 0); |
93 | } |
94 | |