Adding upstream version 14.2.21.upstream/14.2.21upstream

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

1 files changed, 62 insertions, 0 deletions

diff --git a/src/boost/libs/lockfree/examples/spsc_queue.cpp b/src/boost/libs/lockfree/examples/spsc_queue.cpp
new file mode 100644
index 00000000..6c6adc17
--- /dev/null
+++ b/src/boost/libs/lockfree/examples/spsc_queue.cpp
@@ -0,0 +1,62 @@
+//  Copyright (C) 2009 Tim Blechmann
+//
+//  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)
+
+//[spsc_queue_example
+#include <boost/thread/thread.hpp>
+#include <boost/lockfree/spsc_queue.hpp>
+#include <iostream>
+
+#include <boost/atomic.hpp>
+
+int producer_count = 0;
+boost::atomic_int consumer_count (0);
+
+boost::lockfree::spsc_queue<int, boost::lockfree::capacity<1024> > spsc_queue;
+
+const int iterations = 10000000;
+
+void producer(void)
+{
+    for (int i = 0; i != iterations; ++i) {
+        int value = ++producer_count;
+        while (!spsc_queue.push(value))
+            ;
+    }
+}
+
+boost::atomic<bool> done (false);
+
+void consumer(void)
+{
+    int value;
+    while (!done) {
+        while (spsc_queue.pop(value))
+            ++consumer_count;
+    }
+
+    while (spsc_queue.pop(value))
+        ++consumer_count;
+}
+
+int main(int argc, char* argv[])
+{
+    using namespace std;
+    cout << "boost::lockfree::queue is ";
+    if (!spsc_queue.is_lock_free())
+        cout << "not ";
+    cout << "lockfree" << endl;
+
+    boost::thread producer_thread(producer);
+    boost::thread consumer_thread(consumer);
+
+    producer_thread.join();
+    done = true;
+    consumer_thread.join();
+
+    cout << "produced " << producer_count << " objects." << endl;
+    cout << "consumed " << consumer_count << " objects." << endl;
+}
+//]