diff --git a/mlir/include/mlir/ExecutionEngine/AsyncRuntime.h b/mlir/include/mlir/ExecutionEngine/AsyncRuntime.h
--- a/mlir/include/mlir/ExecutionEngine/AsyncRuntime.h
+++ b/mlir/include/mlir/ExecutionEngine/AsyncRuntime.h
@@ -22,6 +22,21 @@
 #define MLIR_ASYNCRUNTIME_DEFINE_FUNCTIONS
 #endif // mlir_async_runtime_EXPORTS
 
+#ifdef _WIN32
+#ifndef MLIR_ASYNCRUNTIME_EXPORT
+#ifdef mlir_async_runtime_EXPORTS
+// We are building this library
+#define MLIR_ASYNCRUNTIME_EXPORT __declspec(dllexport)
+#else
+// We are using this library
+#define MLIR_ASYNCRUNTIME_EXPORT __declspec(dllimport)
+#endif // mlir_async_runtime_EXPORTS
+#endif // MLIR_ASYNCRUNTIME_EXPORT
+#else
+// Non-windows: use visibility attributes.
+#define MLIR_ASYNCRUNTIME_EXPORT __attribute__((visibility("default")))
+#endif // _WIN32
+
 namespace mlir {
 namespace runtime {
 
@@ -52,86 +67,104 @@
 using RefCountedObjPtr = void *;
 
 // Adds references to reference counted runtime object.
-extern "C" void mlirAsyncRuntimeAddRef(RefCountedObjPtr, int64_t);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+    mlirAsyncRuntimeAddRef(RefCountedObjPtr, int64_t);
 
 // Drops references from reference counted runtime object.
-extern "C" void mlirAsyncRuntimeDropRef(RefCountedObjPtr, int64_t);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+    mlirAsyncRuntimeDropRef(RefCountedObjPtr, int64_t);
 
 // Create a new `async.token` in not-ready state.
-extern "C" AsyncToken *mlirAsyncRuntimeCreateToken();
+extern "C" MLIR_ASYNCRUNTIME_EXPORT AsyncToken *mlirAsyncRuntimeCreateToken();
 
 // Create a new `async.value` in not-ready state. Size parameter specifies the
 // number of bytes that will be allocated for the async value storage. Storage
 // is owned by the `async.value` and deallocated when the async value is
 // destructed (reference count drops to zero).
-extern "C" AsyncValue *mlirAsyncRuntimeCreateValue(int64_t);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT AsyncValue *
+    mlirAsyncRuntimeCreateValue(int64_t);
 
 // Create a new `async.group` in empty state.
-extern "C" AsyncGroup *mlirAsyncRuntimeCreateGroup(int64_t size);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT AsyncGroup *
+mlirAsyncRuntimeCreateGroup(int64_t size);
 
-extern "C" int64_t mlirAsyncRuntimeAddTokenToGroup(AsyncToken *, AsyncGroup *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT int64_t
+mlirAsyncRuntimeAddTokenToGroup(AsyncToken *, AsyncGroup *);
 
 // Switches `async.token` to ready state and runs all awaiters.
-extern "C" void mlirAsyncRuntimeEmplaceToken(AsyncToken *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeEmplaceToken(AsyncToken *);
 
 // Switches `async.value` to ready state and runs all awaiters.
-extern "C" void mlirAsyncRuntimeEmplaceValue(AsyncValue *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeEmplaceValue(AsyncValue *);
 
 // Switches `async.token` to error state and runs all awaiters.
-extern "C" void mlirAsyncRuntimeSetTokenError(AsyncToken *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeSetTokenError(AsyncToken *);
 
 // Switches `async.value` to error state and runs all awaiters.
-extern "C" void mlirAsyncRuntimeSetValueError(AsyncValue *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeSetValueError(AsyncValue *);
 
 // Returns true if token is in the error state.
-extern "C" bool mlirAsyncRuntimeIsTokenError(AsyncToken *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT bool
+mlirAsyncRuntimeIsTokenError(AsyncToken *);
 
 // Returns true if value is in the error state.
-extern "C" bool mlirAsyncRuntimeIsValueError(AsyncValue *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT bool
+mlirAsyncRuntimeIsValueError(AsyncValue *);
 
 // Returns true if group is in the error state (any of the tokens or values
 // added to the group are in the error state).
-extern "C" bool mlirAsyncRuntimeIsGroupError(AsyncGroup *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT bool
+mlirAsyncRuntimeIsGroupError(AsyncGroup *);
 
 // Blocks the caller thread until the token becomes ready.
-extern "C" void mlirAsyncRuntimeAwaitToken(AsyncToken *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeAwaitToken(AsyncToken *);
 
 // Blocks the caller thread until the value becomes ready.
-extern "C" void mlirAsyncRuntimeAwaitValue(AsyncValue *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeAwaitValue(AsyncValue *);
 
 // Blocks the caller thread until the elements in the group become ready.
-extern "C" void mlirAsyncRuntimeAwaitAllInGroup(AsyncGroup *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeAwaitAllInGroup(AsyncGroup *);
 
 // Returns a pointer to the storage owned by the async value.
-extern "C" ValueStorage mlirAsyncRuntimeGetValueStorage(AsyncValue *);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT ValueStorage
+mlirAsyncRuntimeGetValueStorage(AsyncValue *);
 
 // Executes the task (coro handle + resume function) in one of the threads
 // managed by the runtime.
-extern "C" void mlirAsyncRuntimeExecute(CoroHandle, CoroResume);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void mlirAsyncRuntimeExecute(CoroHandle,
+                                                                 CoroResume);
 
 // Executes the task (coro handle + resume function) in one of the threads
 // managed by the runtime after the token becomes ready.
-extern "C" void mlirAsyncRuntimeAwaitTokenAndExecute(AsyncToken *, CoroHandle,
-                                                     CoroResume);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeAwaitTokenAndExecute(AsyncToken *, CoroHandle, CoroResume);
 
 // Executes the task (coro handle + resume function) in one of the threads
 // managed by the runtime after the value becomes ready.
-extern "C" void mlirAsyncRuntimeAwaitValueAndExecute(AsyncValue *, CoroHandle,
-                                                     CoroResume);
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
+mlirAsyncRuntimeAwaitValueAndExecute(AsyncValue *, CoroHandle, CoroResume);
 
 // Executes the task (coro handle + resume function) in one of the threads
 // managed by the runtime after the all members of the group become ready.
-extern "C" void
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void
 mlirAsyncRuntimeAwaitAllInGroupAndExecute(AsyncGroup *, CoroHandle, CoroResume);
 
 // Returns the current number of available worker threads in the threadpool.
-extern "C" int64_t mlirAsyncRuntimGetNumWorkerThreads();
+extern "C" MLIR_ASYNCRUNTIME_EXPORT int64_t
+mlirAsyncRuntimGetNumWorkerThreads();
 
 //===----------------------------------------------------------------------===//
 // Small async runtime support library for testing.
 //===----------------------------------------------------------------------===//
 
-extern "C" void mlirAsyncRuntimePrintCurrentThreadId();
+extern "C" MLIR_ASYNCRUNTIME_EXPORT void mlirAsyncRuntimePrintCurrentThreadId();
 
 } // namespace runtime
 } // namespace mlir