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Diffstat (limited to '')
-rw-r--r-- | src/boost/libs/thread/example/mutex.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/boost/libs/thread/example/mutex.cpp b/src/boost/libs/thread/example/mutex.cpp new file mode 100644 index 00000000..9e476208 --- /dev/null +++ b/src/boost/libs/thread/example/mutex.cpp @@ -0,0 +1,47 @@ +// Copyright (C) 2001-2003 +// William E. Kempf +// +// Distributed under the Boost Software License, Version 1.0. (See accompanying +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) + +#include <boost/thread/mutex.hpp> +#include <boost/thread/thread.hpp> +#include <iostream> + +boost::mutex io_mutex; // The iostreams are not guaranteed to be thread-safe! + +class counter +{ +public: + counter() : count(0) { } + + int increment() { + boost::unique_lock<boost::mutex> scoped_lock(mutex); + return ++count; + } + +private: + boost::mutex mutex; + int count; +}; + +counter c; + +void change_count() +{ + int i = c.increment(); + boost::unique_lock<boost::mutex> scoped_lock(io_mutex); + std::cout << "count == " << i << std::endl; +} + +int main(int, char*[]) +{ + const int num_threads = 4; + boost::thread_group thrds; + for (int i=0; i < num_threads; ++i) + thrds.create_thread(&change_count); + + thrds.join_all(); + + return 0; +} |