-/* Enables using asynchronous I/O. Some implementations may treat this as a
- * no-op.
- *
- * Before this function is called, the POSIX aio implementation uses ordinary
- * synchronous I/O because some POSIX aio libraries actually use threads
- * internally, which has enough cost and robustness implications that it's
- * better to use asynchronous I/O only when it has real expected benefits.
- *
- * Must be called while the process is still single-threaded. May forbid the
- * process from subsequently forking. */
-void async_append_enable(void);
-