Add a portable semaphore class with timeout support

1 files changed, 29 insertions, 0 deletions

diff --git a/libadhocutil/semaphore.h b/libadhocutil/semaphore.h
new file mode 100644
index 0000000..de10333
--- /dev/null
+++ b/libadhocutil/semaphore.h
@@ -0,0 +1,29 @@
+#ifndef ADHOCUTIL_SEMAPHORE_H
+#define ADHOCUTIL_SEMAPHORE_H
+
+// Borrowed from StackOverflow
+// http://stackoverflow.com/questions/4792449/c0x-has-no-semaphores-how-to-synchronize-threads
+
+#include <boost/thread/condition.hpp>
+#include <boost/thread/mutex.hpp>
+#include "visibility.h"
+
+namespace AdHoc {
+	/// A portable semaphore with timeout support
+	class DLL_PUBLIC Semaphore {
+		public:
+			Semaphore(unsigned int initial = 0);
+
+			void notify();
+			void wait();
+			bool wait(unsigned int);
+
+		private:
+			boost::mutex mutex;
+			boost::condition_variable condition;
+			unsigned long count;
+	};
+}
+
+#endif
+