Add a convenient and race-free method of watching local files from the
GLib worker thread.
Without this, the race-free way to create a monitor that dispatches
events to the worker thread looked something like this:
- dispatch an idle to the worker thread
- from the idle, create the monitor and connect signals
- from the original thread, wait (on a cond?) until the worker thread
has finished setting up the monitor
- read the file that you were monitoring
which is just ridiculously complicated...
To use the new API:
monitor = g_local_file_monitor_new_in_worker ("/path/to/some/file",
G_FILE_MONITOR_NONE,
&error);
g_assert_no_error (error);
g_signal_connect (monitor, "changed", G_CALLBACK (callback), NULL);
g_local_file_monitor_start (monitor);
'callback' will run from the GLib worker thread.
This is the reason that the start() call was introduced in the previous
commit. The backends that don't use the start() call will have a very
thin race between creating the monitor and connecting the signal, but
hopefully they will be fixed soon.
These new APIs will be used (at least) from gdesktopappinfo to watch for
changes in the desktop file directories.
https://bugzilla.gnome.org/show_bug.cgi?id=704887
and start using the new start() vcall on the local monitor classes.
I only port inotify because I am uncomfortable making changes to the
other monitor backends without having a way of testing them.
https://bugzilla.gnome.org/show_bug.cgi?id=704887
Stop abusing constructor() to do startup work, adding _start() calls
instead.
The backends themselves still use constructor() although a patch will be
following to also fix inotify.
The reason for using a separate start() call instead of constructed()
will become apparent in future commits.
https://bugzilla.gnome.org/show_bug.cgi?id=704887
During initialisation of a directory monitor with the
G_FILE_MONITOR_WATCH_MOUNTS flag set, GLocalDirectory monitor will add a
UNIX mount watch in case the file notification backend doesn't support
reporting these events for itself.
Unfortunately, it was performing the check incorrectly, resulting in a
monitor always being added.
Fix that, and add the #define for G_LOCAL_DIRECTORY_MONITOR_GET_CLASS()
that was also missing (since the fix depends on it).
https://bugzilla.gnome.org/show_bug.cgi?id=704882
Matthew Barnes noted this on IRC a few days ago. I just had this file
open for other reasons and decided to tweak the docs to make this trap
more clear.
https://bugzilla.gnome.org/show_bug.cgi?id=709301
Don't return children with invalid schemas from
g_settings_list_children() (ie: missing schemas or mismatched paths).
This prevents gsettings list-recursively from crashing when broken
schemas are installed on the system.
https://bugzilla.gnome.org/show_bug.cgi?id=705688
Add NULL check and return after calls to g_param_spec_internal in GParamSpec
creation functions. This avoids glib crashing due to things like badly named
properties.
https://bugzilla.gnome.org/show_bug.cgi?id=707887
This stack exists only to answer the question of "what is the currently
dispatching source" and is handled in a way that makes it very clear
that we don't need to be using a linked list at all...
Just store the GSource directly.
Independently discovered (and same solution) by Phillip Susi.
https://bugzilla.gnome.org/show_bug.cgi?id=709113
There are some corner cases where using the sync version of read/write
in a thread could cause thread-safety issues. In these cases it's
possible to override the output stream's splice_async() function,
but for input streams one would need to do some acrobatics to
stay thread-safe. Alternatively, some implementations may not even
override their sync read/write functions.
This patch refactors the default splice_async() implementation to
call the sync read and write functions in a thread only when both
async versions are thread-based. When one or both are non-threaded,
it calls the virtual write_async() and read_async() functions of the
involved streams within the same thread.
https://bugzilla.gnome.org/show_bug.cgi?id=691581
Refactor g_output_stream_close_async() into itself and an internal
variant for potential use inside other operations (splice_async).
The internal version must be called between
g_output_stream_set_pending() and g_output_stream_clear_pending().
https://bugzilla.gnome.org/show_bug.cgi?id=691581
Previously, no testcases tested the close flags of
g_output_stream_splice_async. This patch adds tests for that and
also tests various combinations of threaded and non-threaded
GInputStream async reads and GOutputStream async writes.
https://bugzilla.gnome.org/show_bug.cgi?id=691581
In implementing a better g_output_stream_splice_async() and possibly
other situtations it's helpful to know whether the output stream's
write function internally uses threads. If it and the input stream's
read async functions use threads, then the splice function could
spawn a single thread for better efficiency.
This patch adds a function to determine whether an output stream's
g_output_stream_write_async() function internally uses threads.
https://bugzilla.gnome.org/show_bug.cgi?id=691581
In implementing a better g_output_stream_splice_async() and possibly
other situtations it's helpful to know whether the input stream's
read function internally uses threads. If it and the output stream's
write async functions use threads, then the splice function could
spawn a single thread for better efficiency.
This patch adds a function to determine whether an input stream's
g_input_stream_read_async() function internally uses threads.
https://bugzilla.gnome.org/show_bug.cgi?id=691581
Rather than always calling out to g_file_get_path() (which
might block, whatever the documentation might say), postpone
the call until we actually need it.
https://bugzilla.gnome.org/show_bug.cgi?id=708753
Recent changes to the properties testcase made invalid use of the GArray
free function. This free function takes a pointer to the item to be
freed, not the item itself. Since that item was a pointer to a GObject,
g_object_unref() was getting a GObject**, rather than a GObject*.
The use of GArray in this testcase is pretty questionable in the first
place, so just use C arrays instead.
g_cancellable_disconnect will wait until any pending "cancelled"
handlers finish. This is useful because disconnecting a handler can have the
side-effect of freeing data that the cancelled handler may rely on.
Unfortunately, the code used to enforce this synchronization between
"cancelled" handlers and g_cancellable_disconnect will also cause
deadlock if the cancelled handler itself calls g_cancellable_disconect.
Obviously, if g_cancellable_disconnect is explicitly called by a "cancelled"
handler, then the "cancelled" handler is shouldering the responsibility
of not using any data that may be freed by disconnection.
Also, g_cancellable_disconnect can be called in unexpected places by
lower layers in the code (for instance as a result of g_source_destroy).
In practice, this means it's easy for deadlocks to inadvertently crop
up when using "cancelled" handlers.
For these reasons, it would be good to fix the deadlock.
This commit prevents the deadlock by allowing foregoing synchronization,
if a pending "cancelled" handler is in the same thread as the
g_cancellabale_disconnnect call.
https://bugzilla.gnome.org/show_bug.cgi?id=705395
This commit adds a test to ensure that during a signal emission, if
a signal handler gets disconnected, it won't be run, even if it would
have run before the disconnection.
