1 files changed, 34 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/utils/thread_utils/semaphore.h b/comm/third_party/botan/src/lib/utils/thread_utils/semaphore.h
new file mode 100644
index 0000000000..538d9ecb51
--- /dev/null
+++ b/comm/third_party/botan/src/lib/utils/thread_utils/semaphore.h
@@ -0,0 +1,34 @@
+/*
+* Semaphore
+* (C) 2013 Joel Low
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_SEMAPHORE_H_
+#define BOTAN_SEMAPHORE_H_
+
+#include <condition_variable>
+#include <mutex>
+
+namespace Botan {
+
+class Semaphore final
+   {
+   public:
+      explicit Semaphore(int value = 0) : m_value(value), m_wakeups(0) {}
+
+      void acquire();
+
+      void release(size_t n = 1);
+
+   private:
+      int m_value;
+      int m_wakeups;
+      std::mutex m_mutex;
+      std::condition_variable m_cond;
+   };
+
+}
+
+#endif