hsbench: add Hyperscan benchmarker

The hsbench tool provides an easy way to measure Hyperscan's
performance for a particular set of patterns and corpus of data
to be scanned.

tools/hsbench/thread_barrier.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2015, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ * \brief Simple thread barrier.
+ */
+
+#ifndef TOOLS_THREAD_BARRIER_H
+#define TOOLS_THREAD_BARRIER_H
+
+#include <condition_variable>
+#include <mutex>
+
+/**
+ * \brief Simple thread barrier class.
+ *
+ * Blocks until wait() has been called N times.
+ */
+class thread_barrier {
+public:
+    explicit thread_barrier(unsigned int n) : max(n) {
+        if (max == 0) {
+            throw std::runtime_error("invalid barrier");
+        }
+    }
+
+    void wait() {
+        std::unique_lock<std::mutex> lock(mtx);
+        count++;
+        if (count >= max) {
+            count = 0;
+            condvar.notify_all();
+        } else {
+            condvar.wait(lock);
+        }
+    }
+
+private:
+    std::mutex mtx;
+    std::condition_variable condvar;
+    unsigned int count = 0;
+    unsigned int max;
+};
+
+#endif // TOOLS_THREAD_BARRIER_H