if the stream is not currently writable (and error is not set), or [gio.types.PollableReturn.Failed] if there was an error in which case error will be set.
PollableOutputStream.writevNonblocking
gio.types.PollableReturn writevNonblocking(gio.types.OutputVector[] vectors, out size_t bytesWritten, gio.cancellable.Cancellable cancellable = null)Attempts to write the bytes contained in the n_vectors vectors to stream, as with [gio.output_stream.OutputStream.writev]. If stream is not currently writable, this will immediately return %G_POLLABLE_RETURN_WOULD_BLOCK, and you can use [gio.pollable_output_stream.PollableOutputStream.createSource] to create a #GSource that will be triggered when stream is writable. error will not be set in that case.
Note that since this method never blocks, you cannot actually use cancellable to cancel it. However, it will return an error if cancellable has already been cancelled when you call, which may happen if you call this method after a source triggers due to having been cancelled.
Also note that if [gio.types.PollableReturn.WouldBlock] is returned some underlying transports like D/TLS require that you re-send the same vectors and n_vectors in the next write call.
The behaviour of this method is undefined if [gio.pollable_output_stream.PollableOutputStream.canPoll] returns false for stream.
Parameters
vectors | the buffer containing the #GOutputVectors to write. |
bytesWritten | location to store the number of bytes that were written to the stream |
cancellable | a #GCancellable, or null |
Returns
%G_POLLABLE_RETURN_OK on success, [gio.types.PollableReturn.WouldBlock]
Throws
[ErrorWrap]