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5c30094f RO |
1 | // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* mips-sgi-irix6* powerpc-ibm-aix* } } |
2 | // { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* mips-sgi-irix6* powerpc-ibm-aix* } } | |
9b2b801a JW |
3 | // { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } } |
4 | // { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } } | |
5 | // { dg-require-cstdint "" } | |
6 | // { dg-require-gthreads "" } | |
7 | ||
f6392e8f | 8 | // Copyright (C) 2010, 2011, 2012 Free Software Foundation, Inc. |
9b2b801a JW |
9 | // |
10 | // This file is part of the GNU ISO C++ Library. This library is free | |
11 | // software; you can redistribute it and/or modify it under the | |
12 | // terms of the GNU General Public License as published by the | |
13 | // Free Software Foundation; either version 3, or (at your option) | |
14 | // any later version. | |
15 | ||
16 | // This library is distributed in the hope that it will be useful, | |
17 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | // GNU General Public License for more details. | |
20 | ||
21 | // You should have received a copy of the GNU General Public License along | |
22 | // with this library; see the file COPYING3. If not see | |
23 | // <http://www.gnu.org/licenses/>. | |
24 | ||
25 | ||
26 | #include <mutex> | |
27 | #include <testsuite_hooks.h> | |
28 | ||
29 | struct unreliable_lock | |
30 | { | |
31 | std::mutex m; | |
32 | std::unique_lock<std::mutex> l; | |
33 | ||
34 | static int count; | |
35 | static int throw_on; | |
36 | static int lock_on; | |
37 | ||
38 | unreliable_lock() : l(m, std::defer_lock) { } | |
39 | ||
40 | ~unreliable_lock() | |
41 | { | |
42 | bool test __attribute__((unused)) = true; | |
43 | VERIFY( !l.owns_lock() ); | |
44 | } | |
45 | ||
46 | void lock() | |
47 | { | |
48 | if (count == throw_on) | |
49 | throw throw_on; | |
50 | ++count; | |
51 | l.lock(); | |
52 | } | |
53 | bool try_lock() | |
54 | { | |
55 | if (count == throw_on) | |
56 | throw throw_on; | |
57 | std::unique_lock<std::mutex> l2(m, std::defer_lock); | |
58 | if (count == lock_on) | |
59 | l2.lock(); | |
60 | ++count; | |
61 | return l.try_lock(); | |
62 | } | |
63 | ||
64 | void unlock() | |
65 | { | |
66 | bool test __attribute__((unused)) = true; | |
67 | VERIFY( l.owns_lock() ); | |
68 | l.unlock(); | |
69 | } | |
70 | ||
71 | }; | |
72 | ||
73 | int unreliable_lock::count = 0; | |
74 | int unreliable_lock::throw_on = -1; | |
75 | int unreliable_lock::lock_on = -1; | |
76 | ||
77 | void test01() | |
78 | { | |
79 | bool test __attribute__((unused)) = true; | |
80 | ||
81 | unreliable_lock l1, l2, l3; | |
82 | ||
83 | try | |
84 | { | |
85 | unreliable_lock::count = 0; | |
86 | int result = std::try_lock(l1, l2, l3); | |
87 | VERIFY( result == -1 ); | |
88 | VERIFY( unreliable_lock::count == 3 ); | |
89 | l1.unlock(); | |
90 | l2.unlock(); | |
91 | l3.unlock(); | |
92 | } | |
93 | catch (...) | |
94 | { | |
95 | VERIFY( false ); | |
96 | } | |
97 | } | |
98 | ||
99 | void test02() | |
100 | { | |
101 | bool test __attribute__((unused)) = true; | |
102 | ||
103 | unreliable_lock l1, l2, l3; | |
104 | ||
105 | try | |
106 | { | |
107 | // test behaviour when a lock is already held | |
108 | unreliable_lock::lock_on = 0; | |
109 | while (unreliable_lock::lock_on < 3) | |
110 | { | |
111 | unreliable_lock::count = 0; | |
112 | int failed = std::try_lock(l1, l2, l3); | |
113 | VERIFY( failed == unreliable_lock::lock_on ); | |
114 | ++unreliable_lock::lock_on; | |
115 | } | |
116 | } | |
117 | catch (...) | |
118 | { | |
119 | VERIFY( false ); | |
120 | } | |
121 | } | |
122 | ||
123 | void test03() | |
124 | { | |
125 | bool test __attribute__((unused)) = true; | |
126 | ||
127 | unreliable_lock l1, l2, l3; | |
128 | ||
129 | try | |
130 | { | |
131 | // test behaviour when an exception is thrown | |
132 | unreliable_lock::throw_on = 0; | |
133 | while (unreliable_lock::throw_on < 3) | |
134 | { | |
135 | unreliable_lock::count = 0; | |
136 | int failed = std::try_lock(l1, l2, l3); | |
137 | VERIFY( failed == unreliable_lock::throw_on ); | |
138 | ++unreliable_lock::throw_on; | |
139 | } | |
140 | } | |
141 | catch (...) | |
142 | { | |
143 | VERIFY( false ); | |
144 | } | |
145 | } | |
146 | ||
147 | int main() | |
148 | { | |
149 | test01(); | |
150 | test02(); | |
151 | test03(); | |
152 | return 0; | |
153 | } |