diff --git a/compio-runtime/Cargo.toml b/compio-runtime/Cargo.toml
index 59efda7a..c4e1a669 100644
--- a/compio-runtime/Cargo.toml
+++ b/compio-runtime/Cargo.toml
@@ -52,6 +52,9 @@ windows-sys = { workspace = true, features = ["Win32_System_IO"] }
 os_pipe = { workspace = true }
 libc = { workspace = true }
 
+[target.'cfg(target_os = "macos")'.dev-dependencies]
+core-foundation = "0.9"
+
 [features]
 event = ["dep:cfg-if", "compio-buf/arrayvec"]
 time = ["dep:slab"]
diff --git a/compio-runtime/tests/custom_loop.rs b/compio-runtime/tests/custom_loop.rs
new file mode 100644
index 00000000..fc51fe79
--- /dev/null
+++ b/compio-runtime/tests/custom_loop.rs
@@ -0,0 +1,82 @@
+#[cfg(target_os = "macos")]
+#[test]
+fn cf_run_loop() {
+    use std::{os::raw::c_void, time::Duration};
+
+    use compio_driver::AsRawFd;
+    use compio_runtime::Runtime;
+    use core_foundation::{
+        base::TCFType,
+        filedescriptor::{kCFFileDescriptorReadCallBack, CFFileDescriptor, CFFileDescriptorRef},
+        runloop::{kCFRunLoopDefaultMode, CFRunLoop},
+    };
+    use futures_util::Future;
+
+    struct CFRunLoopRuntime {
+        runtime: Runtime,
+    }
+
+    impl CFRunLoopRuntime {
+        pub fn new() -> Self {
+            let runtime = Runtime::new().unwrap();
+
+            extern "C" fn callback(
+                fdref: CFFileDescriptorRef,
+                _callback_types: usize,
+                _info: *mut c_void,
+            ) {
+                let fd = unsafe { CFFileDescriptor::wrap_under_get_rule(fdref) };
+                fd.enable_callbacks(kCFFileDescriptorReadCallBack);
+            }
+
+            let source = CFFileDescriptor::new(runtime.as_raw_fd(), false, callback, None).unwrap();
+            source.enable_callbacks(kCFFileDescriptorReadCallBack);
+            let source = source.to_run_loop_source(0).unwrap();
+
+            CFRunLoop::get_current().add_source(&source, unsafe { kCFRunLoopDefaultMode });
+
+            Self { runtime }
+        }
+
+        pub fn block_on<F: Future>(&self, future: F) -> F::Output {
+            let _guard = self.runtime.enter();
+            let mut result = None;
+            unsafe {
+                self.runtime
+                    .spawn_unchecked(async { result = Some(future.await) })
+            }
+            .detach();
+            loop {
+                self.runtime.run();
+                if let Some(result) = result.take() {
+                    break result;
+                }
+                self.runtime.poll_with(|driver, timeout, entries| {
+                    match driver.poll(Some(Duration::ZERO), entries) {
+                        Ok(()) => {
+                            if !entries.is_empty() {
+                                return Ok(());
+                            }
+                        }
+                        Err(e) if e.kind() == std::io::ErrorKind::TimedOut => {}
+                        Err(e) => return Err(e),
+                    }
+                    CFRunLoop::run_in_mode(
+                        unsafe { kCFRunLoopDefaultMode },
+                        timeout.unwrap_or(Duration::MAX),
+                        true,
+                    );
+                    Ok(())
+                });
+            }
+        }
+    }
+
+    let runtime = CFRunLoopRuntime::new();
+
+    let res = runtime.block_on(async {
+        compio_runtime::time::sleep(Duration::from_secs(1)).await;
+        1
+    });
+    assert_eq!(res, 1);
+}