fixes #506 AIO "providers" need a way to call nni_aio_schedule.

1 files changed, 64 insertions, 0 deletions

diff --git a/docs/man/nng_aio_begin.3.adoc b/docs/man/nng_aio_begin.3.adoc
new file mode 100644
index 00000000..fd72d401
--- /dev/null
+++ b/docs/man/nng_aio_begin.3.adoc
@@ -0,0 +1,64 @@
+= nng_aio_begin(3)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+== NAME
+
+nng_aio_begin - begin asynchronous I/O operation
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/nng.h>
+
+bool nng_aio_begin(nng_aio *aio);
+----
+
+== DESCRIPTION
+
+The `nng_aio_begin()` function is called by the I/O provider to indicate that
+it is going to process the operation.
+
+The function may return `false`, indicating that the _aio_ has been closed
+by the caller asynchronously.
+In this case the provider should abandon the operation and do nothing else.
+
+This operation should be called at the start of any I/O operation, and must
+be called not more than once for a given I/O operation on a given _aio_.
+
+Once this function is called, if `true` is returned, then the provider MUST
+guarantee that `<<nng_aio_finish.3#nng_aio_finish()>>` is called for the _aio_
+exactly once, when the operation is complete or canceled.
+
+NOTE: This function is only for I/O providers (those actually performing
+the operation such as HTTP handler functions or transport providers); ordinary
+users of the _aio_ should not call this function.
+
+== RETURN VALUES
+
+[horizontal]
+`true`:: The operation has been started.
+`false`:: The operation cannot be started.
+
+== ERRORS
+
+None.
+
+== SEE ALSO
+
+[.text-left]
+<<nng_aio_alloc.3#,nng_aio_alloc(3)>>,
+<<nng_aio_cancel.3#,nng_aio_cancel(3)>>,
+<<nng_aio_defer.3#,nng_aio_defer(3)>>,
+<<nng_aio_finish.3#,nng_aio_finish(3)>>,
+<<nng_aio_result.3#,nng_aio_result(3)>>,
+<<nng_aio.5#,nng_aio(5)>>,
+<<nng.7#,nng(7)>>