Initial commit

externals/vcpkg/buildtrees/boost-thread/src/ost-1.79.0-518d8082f0.clean/example/recursive_mutex.cpp

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+// 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/recursive_mutex.hpp>
+#include <boost/thread/thread.hpp>
+#include <iostream>
+
+class counter
+{
+public:
+    counter() : count(0) { }
+
+    int add(int val) {
+        boost::unique_lock<boost::recursive_mutex> scoped_lock(mutex);
+        count += val;
+        return count;
+    }
+    int increment() {
+        boost::unique_lock<boost::recursive_mutex> scoped_lock(mutex);
+        return add(1);
+    }
+
+private:
+    boost::recursive_mutex mutex;
+    int count;
+};
+
+counter c;
+
+void change_count()
+{
+    //std::cout << "count == " << c.increment() << std::endl;
+}
+
+int main(int, char*[])
+{
+    const int num_threads=4;
+
+    boost::thread_group threads;
+    for (int i=0; i < num_threads; ++i)
+        threads.create_thread(&change_count);
+
+    threads.join_all();
+
+    return 0;
+}