1 files changed, 45 insertions, 0 deletions
diff --git a/qemu-aio.h b/qemu-aio.h
new file mode 100644
index 0000000000..79678293ef
--- /dev/null
+++ b/qemu-aio.h
@@ -0,0 +1,45 @@
+/*
+ * QEMU aio implementation
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_AIO_H
+#define QEMU_AIO_H
+
+#include "qemu-common.h"
+#include "qemu-char.h"
+
+/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
+typedef int (AioFlushHandler)(void *opaque);
+
+/* Flush any pending AIO operation. This function will block until all
+ * outstanding AIO operations have been completed or cancelled. */
+void qemu_aio_flush(void);
+
+/* Wait for a single AIO completion to occur.  This function will until a
+ * single AIO opeartion has completed.  It is intended to be used as a looping
+ * primative when simulating synchronous IO based on asynchronous IO. */
+void qemu_aio_wait(void);
+
+/* Register a file descriptor and associated callbacks.  Behaves very similarly
+ * to qemu_set_fd_handler2.  Unlike qemu_set_fd_handler2, these callbacks will
+ * be invoked when using either qemu_aio_wait() or qemu_aio_flush().
+ *
+ * Code that invokes AIO completion functions should rely on this function
+ * instead of qemu_set_fd_handler[2].
+ */
+int qemu_aio_set_fd_handler(int fd,
+                            IOHandler *io_read,
+                            IOHandler *io_write,
+                            AioFlushHandler *io_flush,
+                            void *opaque);
+
+#endif