1 | // Copyright (C) 2001-2003 |
---|---|
2 | // William E. Kempf |
3 | // |
4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
6 | |
7 | #include <boost/thread/recursive_mutex.hpp> |
8 | #include <boost/thread/thread.hpp> |
9 | #include <iostream> |
10 | |
11 | class counter |
12 | { |
13 | public: |
14 | counter() : count(0) { } |
15 | |
16 | int add(int val) { |
17 | boost::unique_lock<boost::recursive_mutex> scoped_lock(mutex); |
18 | count += val; |
19 | return count; |
20 | } |
21 | int increment() { |
22 | boost::unique_lock<boost::recursive_mutex> scoped_lock(mutex); |
23 | return add(val: 1); |
24 | } |
25 | |
26 | private: |
27 | boost::recursive_mutex mutex; |
28 | int count; |
29 | }; |
30 | |
31 | counter c; |
32 | |
33 | void change_count() |
34 | { |
35 | //std::cout << "count == " << c.increment() << std::endl; |
36 | } |
37 | |
38 | int main(int, char*[]) |
39 | { |
40 | const int num_threads=4; |
41 | |
42 | boost::thread_group threads; |
43 | for (int i=0; i < num_threads; ++i) |
44 | threads.create_thread(threadfunc: &change_count); |
45 | |
46 | threads.join_all(); |
47 | |
48 | return 0; |
49 | } |
50 |