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1 | // (C) Copyright 2006-7 Anthony Williams |
2 | // Distributed under the Boost Software License, Version 1.0. (See | |
3 | // accompanying file LICENSE_1_0.txt or copy at | |
4 | // http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #define BOOST_THREAD_VERSION 2 | |
7 | #define BOOST_THREAD_PROVIDES_INTERRUPTIONS | |
8 | #define BOOST_TEST_MODULE Boost.Threads: once test suite | |
9 | ||
10 | #include <boost/test/unit_test.hpp> | |
11 | #include <boost/thread/thread.hpp> | |
12 | #include <boost/thread/mutex.hpp> | |
13 | #include <boost/thread/once.hpp> | |
b32b8144 | 14 | #include <iostream> |
7c673cae | 15 | |
b32b8144 | 16 | #include <boost/thread/detail/log.hpp> |
7c673cae FG |
17 | |
18 | boost::once_flag flag=BOOST_ONCE_INIT; | |
19 | int var_to_init=0; | |
20 | boost::mutex m; | |
21 | ||
22 | void initialize_variable() | |
23 | { | |
24 | // ensure that if multiple threads get in here, they are serialized, so we can see the effect | |
25 | boost::unique_lock<boost::mutex> lock(m); | |
26 | ++var_to_init; | |
27 | } | |
28 | ||
29 | ||
30 | void call_once_thread() | |
31 | { | |
32 | unsigned const loop_count=100; | |
33 | int my_once_value=0; | |
34 | for(unsigned i=0;i<loop_count;++i) | |
35 | { | |
92f5a8d4 | 36 | boost::call_once(flag, &initialize_variable); |
7c673cae FG |
37 | my_once_value=var_to_init; |
38 | if(my_once_value!=1) | |
39 | { | |
40 | break; | |
41 | } | |
42 | } | |
43 | boost::unique_lock<boost::mutex> lock(m); | |
44 | BOOST_CHECK_EQUAL(my_once_value, 1); | |
45 | } | |
46 | ||
47 | BOOST_AUTO_TEST_CASE(test_call_once) | |
48 | { | |
b32b8144 | 49 | BOOST_DETAIL_THREAD_LOG; |
7c673cae FG |
50 | |
51 | unsigned const num_threads=20; | |
52 | boost::thread_group group; | |
53 | ||
54 | try | |
55 | { | |
56 | for(unsigned i=0;i<num_threads;++i) | |
57 | { | |
58 | group.create_thread(&call_once_thread); | |
59 | } | |
60 | group.join_all(); | |
61 | } | |
62 | catch(...) | |
63 | { | |
64 | group.interrupt_all(); | |
65 | group.join_all(); | |
66 | throw; | |
67 | } | |
68 | ||
69 | BOOST_CHECK_EQUAL(var_to_init,1); | |
70 | } | |
71 | ||
72 | int var_to_init_with_functor=0; | |
73 | ||
74 | struct increment_value | |
75 | { | |
76 | int* value; | |
77 | explicit increment_value(int* value_): | |
78 | value(value_) | |
79 | {} | |
80 | ||
81 | void operator()() const | |
82 | { | |
83 | boost::unique_lock<boost::mutex> lock(m); | |
84 | ++(*value); | |
85 | } | |
86 | }; | |
87 | ||
88 | void call_once_with_functor() | |
89 | { | |
90 | unsigned const loop_count=100; | |
91 | int my_once_value=0; | |
92 | static boost::once_flag functor_flag=BOOST_ONCE_INIT; | |
93 | for(unsigned i=0;i<loop_count;++i) | |
94 | { | |
95 | boost::call_once(functor_flag, increment_value(&var_to_init_with_functor)); | |
96 | my_once_value=var_to_init_with_functor; | |
97 | if(my_once_value!=1) | |
98 | { | |
99 | break; | |
100 | } | |
101 | } | |
102 | boost::unique_lock<boost::mutex> lock(m); | |
103 | BOOST_CHECK_EQUAL(my_once_value, 1); | |
104 | } | |
105 | ||
106 | BOOST_AUTO_TEST_CASE(test_call_once_arbitrary_functor) | |
107 | { | |
b32b8144 | 108 | BOOST_DETAIL_THREAD_LOG; |
7c673cae FG |
109 | |
110 | unsigned const num_threads=20; | |
111 | boost::thread_group group; | |
112 | ||
113 | try | |
114 | { | |
115 | for(unsigned i=0;i<num_threads;++i) | |
116 | { | |
117 | group.create_thread(&call_once_with_functor); | |
118 | } | |
119 | group.join_all(); | |
120 | } | |
121 | catch(...) | |
122 | { | |
123 | group.interrupt_all(); | |
124 | group.join_all(); | |
125 | throw; | |
126 | } | |
127 | ||
128 | BOOST_CHECK_EQUAL(var_to_init_with_functor,1); | |
129 | } | |
130 | ||
131 | ||
132 | struct throw_before_third_pass | |
133 | { | |
134 | struct my_exception | |
135 | {}; | |
136 | ||
137 | static unsigned pass_counter; | |
138 | ||
139 | void operator()() const | |
140 | { | |
141 | boost::unique_lock<boost::mutex> lock(m); | |
142 | ++pass_counter; | |
143 | if(pass_counter<3) | |
144 | { | |
145 | throw my_exception(); | |
146 | } | |
147 | } | |
148 | }; | |
149 | ||
150 | unsigned throw_before_third_pass::pass_counter=0; | |
151 | unsigned exception_counter=0; | |
152 | ||
153 | void call_once_with_exception() | |
154 | { | |
155 | static boost::once_flag functor_flag=BOOST_ONCE_INIT; | |
156 | try | |
157 | { | |
158 | boost::call_once(functor_flag, throw_before_third_pass()); | |
159 | } | |
160 | catch(throw_before_third_pass::my_exception) | |
161 | { | |
162 | boost::unique_lock<boost::mutex> lock(m); | |
163 | ++exception_counter; | |
164 | } | |
165 | } | |
166 | ||
167 | BOOST_AUTO_TEST_CASE(test_call_once_retried_on_exception) | |
168 | { | |
b32b8144 | 169 | BOOST_DETAIL_THREAD_LOG; |
7c673cae FG |
170 | unsigned const num_threads=20; |
171 | boost::thread_group group; | |
172 | ||
173 | try | |
174 | { | |
175 | for(unsigned i=0;i<num_threads;++i) | |
176 | { | |
177 | group.create_thread(&call_once_with_exception); | |
178 | } | |
179 | group.join_all(); | |
180 | } | |
181 | catch(...) | |
182 | { | |
183 | group.interrupt_all(); | |
184 | group.join_all(); | |
185 | throw; | |
186 | } | |
187 | ||
188 | BOOST_CHECK_EQUAL(throw_before_third_pass::pass_counter,3u); | |
189 | BOOST_CHECK_EQUAL(exception_counter,2u); | |
190 | } | |
191 | ||
192 |