* Copyright © 2008 codethink
* Copyright © 2009 Red Hat, Inc.
*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* @see_also: #GInputStream, #GOutputStream
*
* GIOStream represents an object that has both read and write streams.
- * Generally the two streams acts as separate input and output streams,
+ * Generally the two streams act as separate input and output streams,
* but they share some common resources and state. For instance, for
- * seekable streams they may use the same position in both streams.
+ * seekable streams, both streams may use the same position.
*
- * Examples of #GIOStream objects are #GSocketConnection which represents
- * a two-way network connection, and #GFileIOStream which represent a
+ * Examples of #GIOStream objects are #GSocketConnection, which represents
+ * a two-way network connection; and #GFileIOStream, which represents a
* file handle opened in read-write mode.
*
* To do the actual reading and writing you need to get the substreams
* The #GIOStream object owns the input and the output streams, not the other
* way around, so keeping the substreams alive will not keep the #GIOStream
* object alive. If the #GIOStream object is freed it will be closed, thus
- * closing the substream, so even if the substreams stay alive they will
- * always just return a %G_IO_ERROR_CLOSED for all operations.
+ * closing the substreams, so even if the substreams stay alive they will
+ * always return %G_IO_ERROR_CLOSED for all operations.
*
* To close a stream use g_io_stream_close() which will close the common
* stream object and also the individual substreams. You can also close
* #GIOStream may still be open. However, some streams may support
* "half-closed" states where one direction of the stream is actually shut down.
*
+ * Operations on #GIOStreams cannot be started while another operation on the
+ * #GIOStream or its substreams is in progress. Specifically, an application can
+ * read from the #GInputStream and write to the #GOutputStream simultaneously
+ * (either in separate threads, or as asynchronous operations in the same
+ * thread), but an application cannot start any #GIOStream operation while there
+ * is a #GIOStream, #GInputStream or #GOutputStream operation in progress, and
+ * an application can’t start any #GInputStream or #GOutputStream operation
+ * while there is a #GIOStream operation in progress.
+ *
+ * This is a product of individual stream operations being associated with a
+ * given #GMainContext (the thread-default context at the time the operation was
+ * started), rather than entire streams being associated with a single
+ * #GMainContext.
+ *
+ * GIO may run operations on #GIOStreams from other (worker) threads, and this
+ * may be exposed to application code in the behaviour of wrapper streams, such
+ * as #GBufferedInputStream or #GTlsConnection. With such wrapper APIs,
+ * application code may only run operations on the base (wrapped) stream when
+ * the wrapper stream is idle. Note that the semantics of such operations may
+ * not be well-defined due to the state the wrapper stream leaves the base
+ * stream in (though they are guaranteed not to crash).
+ *
* Since: 2.22
*/
/**
* g_io_stream_close:
* @stream: a #GIOStream
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
* @error: location to store the error occurring, or %NULL to ignore
*
* Closes the stream, releasing resources related to it. This will also
- * closes the individual input and output streams, if they are not already
+ * close the individual input and output streams, if they are not already
* closed.
*
* Once the stream is closed, all other operations will return
* g_io_stream_close_async:
* @stream: a #GIOStream
* @io_priority: the io priority of the request
- * @cancellable: (allow-none): optional cancellable object
+ * @cancellable: (nullable): optional cancellable object
* @callback: (scope async): callback to call when the request is satisfied
* @user_data: (closure): the data to pass to callback function
*
g_return_if_fail (G_IS_IO_STREAM (stream));
task = g_task_new (stream, cancellable, callback, user_data);
+ g_task_set_source_tag (task, g_io_stream_close_async);
if (stream->priv->closed)
{
GTask *task;
task = g_task_new (stream, cancellable, callback, user_data);
+ g_task_set_source_tag (task, g_io_stream_real_close_async);
g_task_set_check_cancellable (task, FALSE);
g_task_set_priority (task, io_priority);
* @stream2: a #GIOStream.
* @flags: a set of #GIOStreamSpliceFlags.
* @io_priority: the io priority of the request.
- * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
+ * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): a #GAsyncReadyCallback.
* @user_data: (closure): user data passed to @callback.
*
- * Asyncronously splice the output stream of @stream1 to the input stream of
+ * Asynchronously splice the output stream of @stream1 to the input stream of
* @stream2, and splice the output stream of @stream2 to the input stream of
* @stream1.
*
ctx->completed = 0;
task = g_task_new (NULL, cancellable, callback, user_data);
+ g_task_set_source_tag (task, g_io_stream_splice_async);
g_task_set_task_data (task, ctx, (GDestroyNotify) splice_context_free);
if (cancellable != NULL)
projects / platform / upstream / glib.git / blobdiff