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+++ b/third_party/libuv/docs/src/async.rst	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,65 @@
+
+.. _async:
+
+:c:type:`uv_async_t` --- Async handle
+=====================================
+
+Async handles allow the user to "wakeup" the event loop and get a callback
+called from another thread.
+
+
+Data types
+----------
+
+.. c:type:: uv_async_t
+
+    Async handle type.
+
+.. c:type:: void (*uv_async_cb)(uv_async_t* handle)
+
+    Type definition for callback passed to :c:func:`uv_async_init`.
+
+
+Public members
+^^^^^^^^^^^^^^
+
+N/A
+
+.. seealso:: The :c:type:`uv_handle_t` members also apply.
+
+
+API
+---
+
+.. c:function:: int uv_async_init(uv_loop_t* loop, uv_async_t* async, uv_async_cb async_cb)
+
+    Initialize the handle. A NULL callback is allowed.
+
+    :returns: 0 on success, or an error code < 0 on failure.
+
+    .. note::
+        Unlike other handle initialization  functions, it immediately starts the handle.
+
+.. c:function:: int uv_async_send(uv_async_t* async)
+
+    Wake up the event loop and call the async handle's callback.
+
+    :returns: 0 on success, or an error code < 0 on failure.
+
+    .. note::
+        It's safe to call this function from any thread. The callback will be called on the
+        loop thread.
+
+    .. note::
+        :c:func:`uv_async_send` is `async-signal-safe <https://man7.org/linux/man-pages/man7/signal-safety.7.html>`_.
+        It's safe to call this function from a signal handler.
+
+    .. warning::
+        libuv will coalesce calls to :c:func:`uv_async_send`, that is, not every call to it will
+        yield an execution of the callback. For example: if :c:func:`uv_async_send` is called 5
+        times in a row before the callback is called, the callback will only be called once. If
+        :c:func:`uv_async_send` is called again after the callback was called, it will be called
+        again.
+
+.. seealso::
+    The :c:type:`uv_handle_t` API functions also apply.