Method

GioOutputStreamwritev_async

Declaration

void
g_output_stream_writev_async (
  GOutputStream* stream,
  const GOutputVector* vectors,
  gsize n_vectors,
  int io_priority,
  GCancellable* cancellable,
  GAsyncReadyCallback callback,
  gpointer user_data
)

Description

Request an asynchronous write of the bytes contained in n_vectors vectors into the stream. When the operation is finished callback will be called. You can then call g_output_stream_writev_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in G_IO_ERROR_PENDING errors.

On success, the number of bytes written will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

You are guaranteed that this method will never fail with G_IO_ERROR_WOULD_BLOCK — if stream can’t accept more data, the method will just wait until this changes.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see g_output_stream_writev().

Note that no copy of vectors will be made, so it must stay valid until callback is called.

Available since:2.60

Parameters

vectors An array of GOutputVector
 

The buffer containing the GOutputVectors to write.

 The length of the array is specified in the n_vectors argument.
 The data is owned by the caller of the function.
n_vectors gsize
 

The number of vectors to write.

io_priority int
 

The I/O priority of the request.

cancellable GCancellable
 

Optional GCancellable object, NULL to ignore.

 The argument can be NULL.
 The data is owned by the caller of the function.
callback GAsyncReadyCallback
 

Callback to call when the request is satisfied.

 The argument can be NULL.
user_data gpointer
 

The data to pass to callback function.

 The argument can be NULL.