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diff --git a/indra/llcommon/llcoromutex.h b/indra/llcommon/llcoromutex.h
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+++ b/indra/llcommon/llcoromutex.h
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+/**
+ * @file   llcoromutex.h
+ * @author Nat Goodspeed
+ * @date   2024-09-04
+ * @brief  Coroutine-aware synchronization primitives
+ * 
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Copyright (c) 2024, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_LLCOROMUTEX_H)
+#define LL_LLCOROMUTEX_H
+
+#include "mutex.h"
+#include <boost/fiber/future/promise.hpp>
+#include <boost/fiber/future/future.hpp>
+
+// e.g. #include LLCOROS_MUTEX_HEADER
+#define LLCOROS_MUTEX_HEADER   <boost/fiber/mutex.hpp>
+#define LLCOROS_CONDVAR_HEADER <boost/fiber/condition_variable.hpp>
+
+namespace boost {
+    namespace fibers {
+        class mutex;
+        enum class cv_status;
+        class condition_variable;
+    }
+}
+
+namespace llcoro
+{
+
+/**
+ * Aliases for promise and future. An older underlying future implementation
+ * required us to wrap future; that's no longer needed. However -- if it's
+ * important to restore kill() functionality, we might need to provide a
+ * proxy, so continue using the aliases.
+ */
+template <typename T>
+using Promise = boost::fibers::promise<T>;
+template <typename T>
+using Future = boost::fibers::future<T>;
+template <typename T>
+inline
+static Future<T> getFuture(Promise<T>& promise) { return promise.get_future(); }
+
+// use mutex, lock, condition_variable suitable for coroutines
+using Mutex = boost::fibers::mutex;
+using LockType = std::unique_lock<Mutex>;
+using cv_status = boost::fibers::cv_status;
+using ConditionVariable = boost::fibers::condition_variable;
+
+} // namespace llcoro
+
+#endif /* ! defined(LL_LLCOROMUTEX_H) */