Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}