* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
-#ifdef HAVE_UNISTD_H
+#ifdef G_OS_UNIX
#include <unistd.h>
-#endif /* HAVE_UNISTD_H */
+#endif /* G_OS_UNIX */
#include <errno.h>
#include <string.h>
#include <windows.h>
#endif /* G_OS_WIN32 */
-#ifdef G_OS_BEOS
-#include <sys/socket.h>
-#include <sys/wait.h>
-#endif /* G_OS_BEOS */
+#ifdef HAVE_MACH_MACH_TIME_H
+#include <mach/mach_time.h>
+#endif
+
+#include "glib_trace.h"
#include "gmain.h"
* GTK+ contains wrappers of some of these functions, e.g. gtk_main(),
* gtk_main_quit() and gtk_events_pending().
*
- * <refsect2><title>Creating new source types</title>
- * <para>One of the unusual features of the #GMainLoop functionality
+ * ## Creating new source types
+ *
+ * One of the unusual features of the #GMainLoop functionality
* is that new types of event source can be created and used in
* addition to the builtin type of event source. A new event source
* type is used for handling GDK events. A new source type is created
- * by <firstterm>deriving</firstterm> from the #GSource structure.
- * The derived type of source is represented by a structure that has
- * the #GSource structure as a first element, and other elements specific
- * to the new source type. To create an instance of the new source type,
- * call g_source_new() passing in the size of the derived structure and
+ * by "deriving" from the #GSource structure. The derived type of
+ * source is represented by a structure that has the #GSource structure
+ * as a first element, and other elements specific to the new source
+ * type. To create an instance of the new source type, call
+ * g_source_new() passing in the size of the derived structure and
* a table of functions. These #GSourceFuncs determine the behavior of
- * the new source type.</para>
- * <para>New source types basically interact with the main context
+ * the new source type.
+ *
+ * New source types basically interact with the main context
* in two ways. Their prepare function in #GSourceFuncs can set a timeout
* to determine the maximum amount of time that the main loop will sleep
* before checking the source again. In addition, or as well, the source
* can add file descriptors to the set that the main context checks using
- * g_source_add_poll().</para>
- * </refsect2>
- * <refsect2><title>Customizing the main loop iteration</title>
- * <para>Single iterations of a #GMainContext can be run with
+ * g_source_add_poll().
+ *
+ * ## Customizing the main loop iteration
+ *
+ * Single iterations of a #GMainContext can be run with
* g_main_context_iteration(). In some cases, more detailed control
* of exactly how the details of the main loop work is desired, for
* instance, when integrating the #GMainLoop with an external main loop.
* In such cases, you can call the component functions of
* g_main_context_iteration() directly. These functions are
* g_main_context_prepare(), g_main_context_query(),
- * g_main_context_check() and g_main_context_dispatch().</para>
- * <para>The operation of these functions can best be seen in terms
- * of a state diagram, as shown in <xref linkend="mainloop-states"/>.</para>
- * <figure id="mainloop-states"><title>States of a Main Context</title>
- * <graphic fileref="mainloop-states.gif" format="GIF"></graphic>
- * </figure>
- * </refsect2>
- *
- * On Unix, the GLib mainloop is incompatible with fork(). Any program
+ * g_main_context_check() and g_main_context_dispatch().
+ *
+ * ## State of a Main Context # {#mainloop-states}
+ *
+ * The operation of these functions can best be seen in terms
+ * of a state diagram, as shown in this image.
+ *
+ * 
+ *
+ * On UNIX, the GLib mainloop is incompatible with fork(). Any program
* using the mainloop must either exec() or exit() from the child
* without returning to the mainloop.
*/
struct _GMainDispatch
{
gint depth;
- GSList *dispatching_sources; /* stack of current sources */
+ GSource *source;
};
#ifdef G_MAIN_POLL_DEBUG
gint ref_count;
+ GHashTable *sources; /* guint -> GSource */
+
GPtrArray *pending_dispatches;
gint timeout; /* Timeout for current iteration */
guint next_id;
- GHashTable *overflow_used_source_ids; /* set<guint> */
GList *source_lists;
gint in_check_or_prepare;
- GPollRec *poll_records, *poll_records_tail;
+ GPollRec *poll_records;
guint n_poll_records;
GPollFD *cached_poll_array;
guint cached_poll_array_size;
GSource *parent_source;
gint64 ready_time;
+
+ /* This is currently only used on UNIX, but we always declare it (and
+ * let it remain empty on Windows) to avoid #ifdef all over the place.
+ */
+ GSList *fds;
};
typedef struct _GSourceIter
static volatile int unix_signal_pending[NSIG];
static volatile int any_unix_signal_pending;
#endif
+static volatile guint unix_signal_refcount[NSIG];
/* Guards all the data below */
G_LOCK_DEFINE_STATIC (unix_signal_lock);
static GSList *unix_signal_watches;
static GSList *unix_child_watches;
-static GSourceFuncs g_unix_signal_funcs =
+GSourceFuncs g_unix_signal_funcs =
{
g_unix_signal_watch_prepare,
g_unix_signal_watch_check,
GSource *source;
GList *sl_iter;
GSourceList *list;
+ guint i;
g_return_if_fail (context != NULL);
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
main_context_list = g_slist_remove (main_context_list, context);
G_UNLOCK (main_context_list);
+ /* Free pending dispatches */
+ for (i = 0; i < context->pending_dispatches->len; i++)
+ g_source_unref_internal (context->pending_dispatches->pdata[i], context, FALSE);
+
+ /* g_source_iter_next() assumes the context is locked. */
+ LOCK_CONTEXT (context);
g_source_iter_init (&iter, context, TRUE);
while (g_source_iter_next (&iter, &source))
{
source->context = NULL;
- g_source_destroy_internal (source, context, FALSE);
+ g_source_destroy_internal (source, context, TRUE);
}
+ UNLOCK_CONTEXT (context);
+
for (sl_iter = context->source_lists; sl_iter; sl_iter = sl_iter->next)
{
list = sl_iter->data;
}
g_list_free (context->source_lists);
- if (context->overflow_used_source_ids)
- g_hash_table_destroy (context->overflow_used_source_ids);
+ g_hash_table_destroy (context->sources);
g_mutex_clear (&context->mutex);
*
* Creates a new #GMainContext structure.
*
- * Return value: the new #GMainContext
+ * Returns: the new #GMainContext
**/
GMainContext *
g_main_context_new (void)
g_mutex_init (&context->mutex);
g_cond_init (&context->cond);
+ context->sources = g_hash_table_new (NULL, NULL);
context->owner = NULL;
context->waiters = NULL;
* specified, and corresponds to the "main" main loop. See also
* g_main_context_get_thread_default().
*
- * Return value: (transfer none): the global default main context.
+ * Returns: (transfer none): the global default main context.
**/
GMainContext *
g_main_context_default (void)
*
* Acquires @context and sets it as the thread-default context for the
* current thread. This will cause certain asynchronous operations
- * (such as most <link linkend="gio">gio</link>-based I/O) which are
+ * (such as most [gio][gio]-based I/O) which are
* started in this thread to run under @context and deliver their
* results to its main loop, rather than running under the global
* default context in the main thread. Note that calling this function
- * changes the context returned by
- * g_main_context_get_thread_default(), <emphasis>not</emphasis> the
- * one returned by g_main_context_default(), so it does not affect the
- * context used by functions like g_idle_add().
+ * changes the context returned by g_main_context_get_thread_default(),
+ * not the one returned by g_main_context_default(), so it does not affect
+ * the context used by functions like g_idle_add().
*
* Normally you would call this function shortly after creating a new
* thread, passing it a #GMainContext which will be run by a
* operations that want to be able to be run in contexts other than
* the default one should call this method or
* g_main_context_ref_thread_default() to get a #GMainContext to add
- * their #GSource<!-- -->s to. (Note that even in single-threaded
+ * their #GSources to. (Note that even in single-threaded
* programs applications may sometimes want to temporarily push a
* non-default context, so it is not safe to assume that this will
* always return %NULL if you are running in the default thread.)
* Creates a new #GSource structure. The size is specified to
* allow creating structures derived from #GSource that contain
* additional data. The size passed in must be at least
- * <literal>sizeof (GSource)</literal>.
+ * `sizeof (GSource)`.
*
* The source will not initially be associated with any #GMainContext
* and must be added to one with g_source_attach() before it will be
* executed.
*
- * Return value: the newly-created #GSource.
+ * Returns: the newly-created #GSource.
**/
GSource *
g_source_new (GSourceFuncs *source_funcs,
context->source_lists = g_list_remove (context->source_lists, source_list);
g_slice_free (GSourceList, source_list);
}
-
- if (context->overflow_used_source_ids)
- g_hash_table_remove (context->overflow_used_source_ids,
- GUINT_TO_POINTER (source->source_id));
-
}
-static void
-assign_source_id_unlocked (GMainContext *context,
- GSource *source)
+static guint
+g_source_attach_unlocked (GSource *source,
+ GMainContext *context,
+ gboolean do_wakeup)
{
+ GSList *tmp_list;
guint id;
- /* Are we about to overflow back to 0?
- * See https://bugzilla.gnome.org/show_bug.cgi?id=687098
+ /* The counter may have wrapped, so we must ensure that we do not
+ * reuse the source id of an existing source.
*/
- if (G_UNLIKELY (context->next_id == G_MAXUINT &&
- context->overflow_used_source_ids == NULL))
- {
- GSourceIter iter;
- GSource *source;
-
- context->overflow_used_source_ids = g_hash_table_new (NULL, NULL);
-
- g_source_iter_init (&iter, context, FALSE);
- while (g_source_iter_next (&iter, &source))
- {
- g_hash_table_add (context->overflow_used_source_ids,
- GUINT_TO_POINTER (source->source_id));
- }
- id = G_MAXUINT;
- }
- else if (context->overflow_used_source_ids == NULL)
- {
- id = context->next_id++;
- }
- else
- {
- /*
- * If we overran G_MAXUINT, we fall back to randomly probing the
- * source ids for the current context. This will be slower the more
- * sources there are, but we're mainly concerned right now about
- * correctness and code size. There's time for a more clever solution
- * later.
- */
- do
- id = g_random_int ();
- while (id == 0 ||
- g_hash_table_contains (context->overflow_used_source_ids,
- GUINT_TO_POINTER (id)));
- g_hash_table_add (context->overflow_used_source_ids, GUINT_TO_POINTER (id));
- }
+ do
+ id = context->next_id++;
+ while (id == 0 || g_hash_table_contains (context->sources, GUINT_TO_POINTER (id)));
+ source->context = context;
source->source_id = id;
-}
+ source->ref_count++;
-static guint
-g_source_attach_unlocked (GSource *source,
- GMainContext *context)
-{
- GSList *tmp_list;
+ g_hash_table_insert (context->sources, GUINT_TO_POINTER (id), source);
- source->context = context;
- assign_source_id_unlocked (context, source);
- source->ref_count++;
source_add_to_context (source, context);
- tmp_list = source->poll_fds;
- while (tmp_list)
+ if (!SOURCE_BLOCKED (source))
{
- g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data);
- tmp_list = tmp_list->next;
+ tmp_list = source->poll_fds;
+ while (tmp_list)
+ {
+ g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data);
+ tmp_list = tmp_list->next;
+ }
+
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data);
}
tmp_list = source->priv->child_sources;
while (tmp_list)
{
- g_source_attach_unlocked (tmp_list->data, context);
+ g_source_attach_unlocked (tmp_list->data, context, FALSE);
tmp_list = tmp_list->next;
}
+ /* If another thread has acquired the context, wake it up since it
+ * might be in poll() right now.
+ */
+ if (do_wakeup && context->owner && context->owner != G_THREAD_SELF)
+ g_wakeup_signal (context->wakeup);
+
return source->source_id;
}
* Adds a #GSource to a @context so that it will be executed within
* that context. Remove it by calling g_source_destroy().
*
- * Return value: the ID (greater than 0) for the source within the
+ * Returns: the ID (greater than 0) for the source within the
* #GMainContext.
**/
guint
g_return_val_if_fail (source->context == NULL, 0);
g_return_val_if_fail (!SOURCE_DESTROYED (source), 0);
+ TRACE (GLIB_MAIN_SOURCE_ATTACH (g_source_get_name (source)));
+
if (!context)
context = g_main_context_default ();
LOCK_CONTEXT (context);
- result = g_source_attach_unlocked (source, context);
-
- /* If another thread has acquired the context, wake it up since it
- * might be in poll() right now.
- */
- if (context->owner && context->owner != G_THREAD_SELF)
- g_wakeup_signal (context->wakeup);
+ result = g_source_attach_unlocked (source, context, TRUE);
UNLOCK_CONTEXT (context);
GMainContext *context,
gboolean have_lock)
{
+ TRACE (GLIB_MAIN_SOURCE_DESTROY (g_source_get_name (source)));
+
if (!have_lock)
LOCK_CONTEXT (context);
g_main_context_remove_poll_unlocked (context, tmp_list->data);
tmp_list = tmp_list->next;
}
+
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ g_main_context_remove_poll_unlocked (context, tmp_list->data);
}
while (source->priv->child_sources)
*
* Removes a source from its #GMainContext, if any, and mark it as
* destroyed. The source cannot be subsequently added to another
- * context.
+ * context. It is safe to call this on sources which have already been
+ * removed from their context.
**/
void
g_source_destroy (GSource *source)
* context. The reverse
* mapping from ID to source is done by g_main_context_find_source_by_id().
*
- * Return value: the ID (greater than 0) for the source
+ * Returns: the ID (greater than 0) for the source
**/
guint
g_source_get_id (GSource *source)
* g_main_current_source(). But calling this function on a source
* whose #GMainContext has been destroyed is an error.
*
- * Return value: (transfer none) (allow-none): the #GMainContext with which the
+ * Returns: (transfer none) (allow-none): the #GMainContext with which the
* source is associated, or %NULL if the context has not
* yet been added to a source.
**/
* @source:a #GSource
* @fd: a #GPollFD structure holding information about a file
* descriptor to watch.
- *
+ *
* Adds a file descriptor to the set of file descriptors polled for
* this source. This is usually combined with g_source_new() to add an
* event source. The event source's check function will typically test
* the @revents field in the #GPollFD struct and return %TRUE if events need
* to be processed.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
+ * Using this API forces the linear scanning of event sources on each
+ * main loop iteration. Newly-written event sources should try to use
+ * g_source_add_unix_fd() instead of this API.
**/
void
g_source_add_poll (GSource *source,
*
* Removes a file descriptor from the set of file descriptors polled for
* this source.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
**/
void
g_source_remove_poll (GSource *source,
* @source will hold a reference on @child_source while @child_source
* is attached to it.
*
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
* Since: 2.28
**/
void
if (context)
{
+ g_source_attach_unlocked (child_source, context, TRUE);
UNLOCK_CONTEXT (context);
- g_source_attach (child_source, context);
}
}
*
* Detaches @child_source from @source and destroys it.
*
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
* Since: 2.28
**/
void
tmp_list = tmp_list->next;
}
+
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ {
+ g_main_context_remove_poll_unlocked (context, tmp_list->data);
+ g_main_context_add_poll_unlocked (context, priority, tmp_list->data);
+ }
}
}
* source will be dispatched if it is ready to be dispatched and no
* sources at a higher (numerically smaller) priority are ready to be
* dispatched.
+ *
+ * A child source always has the same priority as its parent. It is not
+ * permitted to change the priority of a source once it has been added
+ * as a child of another source.
**/
void
g_source_set_priority (GSource *source,
GMainContext *context;
g_return_if_fail (source != NULL);
+ g_return_if_fail (source->priv->parent_source == NULL);
context = source->context;
*
* Gets the priority of a source.
*
- * Return value: the priority of the source
+ * Returns: the priority of the source
**/
gint
g_source_get_priority (GSource *source)
* Dispatching the source does not reset the ready time. You should do
* so yourself, from the source dispatch function.
*
+ * Note that if you have a pair of sources where the ready time of one
+ * suggests that it will be delivered first but the priority for the
+ * other suggests that it would be delivered first, and the ready time
+ * for both sources is reached during the same main context iteration
+ * then the order of dispatch is undefined.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
* Since: 2.36
**/
void
* Checks whether a source is allowed to be called recursively.
* see g_source_set_can_recurse().
*
- * Return value: whether recursion is allowed.
+ * Returns: whether recursion is allowed.
**/
gboolean
g_source_get_can_recurse (GSource *source)
*
* It is permitted to call this function multiple times, but is not
* recommended due to the potential performance impact. For example,
- * one could change the name in the "check" function of a #GSourceFuncs
+ * one could change the name in the "check" function of a #GSourceFuncs
* to include details like the event type in the source name.
*
+ * Use caution if changing the name while another thread may be
+ * accessing it with g_source_get_name(); that function does not copy
+ * the value, and changing the value will free it while the other thread
+ * may be attempting to use it.
+ *
* Since: 2.26
**/
void
g_source_set_name (GSource *source,
const char *name)
{
+ GMainContext *context;
+
g_return_if_fail (source != NULL);
+ context = source->context;
+
+ if (context)
+ LOCK_CONTEXT (context);
+
/* setting back to NULL is allowed, just because it's
* weird if get_name can return NULL but you can't
* set that.
g_free (source->name);
source->name = g_strdup (name);
+
+ if (context)
+ UNLOCK_CONTEXT (context);
}
/**
* g_source_get_name:
* @source: a #GSource
*
- * Gets a name for the source, used in debugging and profiling.
- * The name may be #NULL if it has never been set with
- * g_source_set_name().
+ * Gets a name for the source, used in debugging and profiling. The
+ * name may be #NULL if it has never been set with g_source_set_name().
+ *
+ * Returns: the name of the source
*
- * Return value: the name of the source
* Since: 2.26
**/
const char *
* This is a convenience utility to set source names from the return
* value of g_idle_add(), g_timeout_add(), etc.
*
+ * It is a programmer error to attempt to set the name of a non-existent
+ * source.
+ *
+ * More specifically: source IDs can be reissued after a source has been
+ * destroyed and therefore it is never valid to use this function with a
+ * source ID which may have already been removed. An example is when
+ * scheduling an idle to run in another thread with g_idle_add(): the
+ * idle may already have run and been removed by the time this function
+ * is called on its (now invalid) source ID. This source ID may have
+ * been reissued, leading to the operation being performed against the
+ * wrong source.
+ *
* Since: 2.26
**/
void
*
* Increases the reference count on a source by one.
*
- * Return value: @source
+ * Returns: @source
**/
GSource *
g_source_ref (GSource *source)
if (!SOURCE_DESTROYED (source))
g_warning (G_STRLOC ": ref_count == 0, but source was still attached to a context!");
source_remove_from_context (source, context);
+
+ g_hash_table_remove (context->sources, GUINT_TO_POINTER (source->source_id));
}
if (source->source_funcs->finalize)
g_slist_free (source->poll_fds);
source->poll_fds = NULL;
+ g_slist_free_full (source->priv->fds, g_free);
+
+ while (source->priv->child_sources)
+ {
+ GSource *child_source = source->priv->child_sources->data;
+
+ source->priv->child_sources =
+ g_slist_remove (source->priv->child_sources, child_source);
+ child_source->priv->parent_source = NULL;
+
+ g_source_unref_internal (child_source, context, have_lock);
+ }
+
g_slice_free (GSourcePrivate, source->priv);
source->priv = NULL;
/**
* g_main_context_find_source_by_id:
* @context: (allow-none): a #GMainContext (if %NULL, the default context will be used)
- * @source_id: the source ID, as returned by g_source_get_id().
- *
+ * @source_id: the source ID, as returned by g_source_get_id().
+ *
* Finds a #GSource given a pair of context and ID.
- *
- * Return value: (transfer none): the #GSource if found, otherwise, %NULL
+ *
+ * It is a programmer error to attempt to lookup a non-existent source.
+ *
+ * More specifically: source IDs can be reissued after a source has been
+ * destroyed and therefore it is never valid to use this function with a
+ * source ID which may have already been removed. An example is when
+ * scheduling an idle to run in another thread with g_idle_add(): the
+ * idle may already have run and been removed by the time this function
+ * is called on its (now invalid) source ID. This source ID may have
+ * been reissued, leading to the operation being performed against the
+ * wrong source.
+ *
+ * Returns: (transfer none): the #GSource
**/
GSource *
g_main_context_find_source_by_id (GMainContext *context,
- guint source_id)
+ guint source_id)
{
- GSourceIter iter;
GSource *source;
-
+
g_return_val_if_fail (source_id > 0, NULL);
if (context == NULL)
context = g_main_context_default ();
-
- LOCK_CONTEXT (context);
-
- g_source_iter_init (&iter, context, FALSE);
- while (g_source_iter_next (&iter, &source))
- {
- if (!SOURCE_DESTROYED (source) &&
- source->source_id == source_id)
- break;
- }
- g_source_iter_clear (&iter);
+ LOCK_CONTEXT (context);
+ source = g_hash_table_lookup (context->sources, GUINT_TO_POINTER (source_id));
UNLOCK_CONTEXT (context);
+ if (source && SOURCE_DESTROYED (source))
+ source = NULL;
+
return source;
}
* multiple sources exist with the same source function and user data,
* the first one found will be returned.
*
- * Return value: (transfer none): the source, if one was found, otherwise %NULL
+ * Returns: (transfer none): the source, if one was found, otherwise %NULL
**/
GSource *
g_main_context_find_source_by_funcs_user_data (GMainContext *context,
* multiple sources exist with the same user data, the first
* one found will be returned.
*
- * Return value: (transfer none): the source, if one was found, otherwise %NULL
+ * Returns: (transfer none): the source, if one was found, otherwise %NULL
**/
GSource *
g_main_context_find_source_by_user_data (GMainContext *context,
/**
* g_source_remove:
* @tag: the ID of the source to remove.
- *
- * Removes the source with the given id from the default main context.
- * The id of
- * a #GSource is given by g_source_get_id(), or will be returned by the
- * functions g_source_attach(), g_idle_add(), g_idle_add_full(),
- * g_timeout_add(), g_timeout_add_full(), g_child_watch_add(),
- * g_child_watch_add_full(), g_io_add_watch(), and g_io_add_watch_full().
+ *
+ * Removes the source with the given id from the default main context.
+ *
+ * The id of a #GSource is given by g_source_get_id(), or will be
+ * returned by the functions g_source_attach(), g_idle_add(),
+ * g_idle_add_full(), g_timeout_add(), g_timeout_add_full(),
+ * g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and
+ * g_io_add_watch_full().
*
* See also g_source_destroy(). You must use g_source_destroy() for sources
* added to a non-default main context.
*
- * Return value: %TRUE if the source was found and removed.
+ * It is a programmer error to attempt to remove a non-existent source.
+ *
+ * More specifically: source IDs can be reissued after a source has been
+ * destroyed and therefore it is never valid to use this function with a
+ * source ID which may have already been removed. An example is when
+ * scheduling an idle to run in another thread with g_idle_add(): the
+ * idle may already have run and been removed by the time this function
+ * is called on its (now invalid) source ID. This source ID may have
+ * been reissued, leading to the operation being performed against the
+ * wrong source.
+ *
+ * Returns: For historical reasons, this function always returns %TRUE
**/
gboolean
g_source_remove (guint tag)
{
GSource *source;
-
+
g_return_val_if_fail (tag > 0, FALSE);
source = g_main_context_find_source_by_id (NULL, tag);
if (source)
g_source_destroy (source);
+ else
+ g_critical ("Source ID %u was not found when attempting to remove it", tag);
return source != NULL;
}
* data for the callback. If multiple sources exist with the same user
* data, only one will be destroyed.
*
- * Return value: %TRUE if a source was found and removed.
+ * Returns: %TRUE if a source was found and removed.
**/
gboolean
g_source_remove_by_user_data (gpointer user_data)
* source functions and user data. If multiple sources exist with the
* same source functions and user data, only one will be destroyed.
*
- * Return value: %TRUE if a source was found and removed.
+ * Returns: %TRUE if a source was found and removed.
**/
gboolean
g_source_remove_by_funcs_user_data (GSourceFuncs *funcs,
return FALSE;
}
+#ifdef G_OS_UNIX
+/**
+ * g_source_add_unix_fd:
+ * @source: a #GSource
+ * @fd: the fd to monitor
+ * @events: an event mask
+ *
+ * Monitors @fd for the IO events in @events.
+ *
+ * The tag returned by this function can be used to remove or modify the
+ * monitoring of the fd using g_source_remove_unix_fd() or
+ * g_source_modify_unix_fd().
+ *
+ * It is not necessary to remove the fd before destroying the source; it
+ * will be cleaned up automatically.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
+ * As the name suggests, this function is not available on Windows.
+ *
+ * Returns: an opaque tag
+ *
+ * Since: 2.36
+ **/
+gpointer
+g_source_add_unix_fd (GSource *source,
+ gint fd,
+ GIOCondition events)
+{
+ GMainContext *context;
+ GPollFD *poll_fd;
+
+ g_return_val_if_fail (source != NULL, NULL);
+ g_return_val_if_fail (!SOURCE_DESTROYED (source), NULL);
+
+ poll_fd = g_new (GPollFD, 1);
+ poll_fd->fd = fd;
+ poll_fd->events = events;
+ poll_fd->revents = 0;
+
+ context = source->context;
+
+ if (context)
+ LOCK_CONTEXT (context);
+
+ source->priv->fds = g_slist_prepend (source->priv->fds, poll_fd);
+
+ if (context)
+ {
+ if (!SOURCE_BLOCKED (source))
+ g_main_context_add_poll_unlocked (context, source->priority, poll_fd);
+ UNLOCK_CONTEXT (context);
+ }
+
+ return poll_fd;
+}
+
+/**
+ * g_source_modify_unix_fd:
+ * @source: a #GSource
+ * @tag: the tag from g_source_add_unix_fd()
+ * @new_events: the new event mask to watch
+ *
+ * Updates the event mask to watch for the fd identified by @tag.
+ *
+ * @tag is the tag returned from g_source_add_unix_fd().
+ *
+ * If you want to remove a fd, don't set its event mask to zero.
+ * Instead, call g_source_remove_unix_fd().
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
+ * As the name suggests, this function is not available on Windows.
+ *
+ * Since: 2.36
+ **/
+void
+g_source_modify_unix_fd (GSource *source,
+ gpointer tag,
+ GIOCondition new_events)
+{
+ GMainContext *context;
+ GPollFD *poll_fd;
+
+ g_return_if_fail (source != NULL);
+ g_return_if_fail (g_slist_find (source->priv->fds, tag));
+
+ context = source->context;
+ poll_fd = tag;
+
+ poll_fd->events = new_events;
+
+ if (context)
+ g_main_context_wakeup (context);
+}
+
+/**
+ * g_source_remove_unix_fd:
+ * @source: a #GSource
+ * @tag: the tag from g_source_add_unix_fd()
+ *
+ * Reverses the effect of a previous call to g_source_add_unix_fd().
+ *
+ * You only need to call this if you want to remove an fd from being
+ * watched while keeping the same source around. In the normal case you
+ * will just want to destroy the source.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
+ * As the name suggests, this function is not available on Windows.
+ *
+ * Since: 2.36
+ **/
+void
+g_source_remove_unix_fd (GSource *source,
+ gpointer tag)
+{
+ GMainContext *context;
+ GPollFD *poll_fd;
+
+ g_return_if_fail (source != NULL);
+ g_return_if_fail (g_slist_find (source->priv->fds, tag));
+
+ context = source->context;
+ poll_fd = tag;
+
+ if (context)
+ LOCK_CONTEXT (context);
+
+ source->priv->fds = g_slist_remove (source->priv->fds, poll_fd);
+
+ if (context)
+ {
+ if (!SOURCE_BLOCKED (source))
+ g_main_context_remove_poll_unlocked (context, poll_fd);
+
+ UNLOCK_CONTEXT (context);
+ }
+
+ g_free (poll_fd);
+}
+
+/**
+ * g_source_query_unix_fd:
+ * @source: a #GSource
+ * @tag: the tag from g_source_add_unix_fd()
+ *
+ * Queries the events reported for the fd corresponding to @tag on
+ * @source during the last poll.
+ *
+ * The return value of this function is only defined when the function
+ * is called from the check or dispatch functions for @source.
+ *
+ * This API is only intended to be used by implementations of #GSource.
+ * Do not call this API on a #GSource that you did not create.
+ *
+ * As the name suggests, this function is not available on Windows.
+ *
+ * Returns: the conditions reported on the fd
+ *
+ * Since: 2.36
+ **/
+GIOCondition
+g_source_query_unix_fd (GSource *source,
+ gpointer tag)
+{
+ GPollFD *poll_fd;
+
+ g_return_val_if_fail (source != NULL, 0);
+ g_return_val_if_fail (g_slist_find (source->priv->fds, tag), 0);
+
+ poll_fd = tag;
+
+ return poll_fd->revents;
+}
+#endif /* G_OS_UNIX */
+
/**
* g_get_current_time:
* @result: #GTimeVal structure in which to store current time.
return (((gint64) tv.tv_sec) * 1000000) + tv.tv_usec;
}
-#ifdef G_OS_WIN32
+/**
+ * g_get_monotonic_time:
+ *
+ * Queries the system monotonic time.
+ *
+ * The monotonic clock will always increase and doesn't suffer
+ * discontinuities when the user (or NTP) changes the system time. It
+ * may or may not continue to tick during times where the machine is
+ * suspended.
+ *
+ * We try to use the clock that corresponds as closely as possible to
+ * the passage of time as measured by system calls such as poll() but it
+ * may not always be possible to do this.
+ *
+ * Returns: the monotonic time, in microseconds
+ *
+ * Since: 2.28
+ **/
+#if defined (G_OS_WIN32)
static ULONGLONG (*g_GetTickCount64) (void) = NULL;
static guint32 g_win32_tick_epoch = 0;
-G_GNUC_INTERNAL void
+void
g_clock_win32_init (void)
{
HMODULE kernel32;
g_GetTickCount64 = (void *) GetProcAddress (kernel32, "GetTickCount64");
g_win32_tick_epoch = ((guint32)GetTickCount()) >> 31;
}
-#endif
-/**
- * g_get_monotonic_time:
- *
- * Queries the system monotonic time, if available.
- *
- * On POSIX systems with clock_gettime() and <literal>CLOCK_MONOTONIC</literal> this call
- * is a very shallow wrapper for that. Otherwise, we make a best effort
- * that probably involves returning the wall clock time (with at least
- * microsecond accuracy, subject to the limitations of the OS kernel).
- *
- * It's important to note that POSIX <literal>CLOCK_MONOTONIC</literal> does
- * not count time spent while the machine is suspended.
- *
- * On Windows, "limitations of the OS kernel" is a rather substantial
- * statement. Depending on the configuration of the system, the wall
- * clock time is updated as infrequently as 64 times a second (which
- * is approximately every 16ms). Also, on XP (but not on Vista or later)
- * the monotonic clock is locally monotonic, but may differ in exact
- * value between processes due to timer wrap handling.
- *
- * Returns: the monotonic time, in microseconds
- *
- * Since: 2.28
- **/
gint64
g_get_monotonic_time (void)
{
-#ifdef HAVE_CLOCK_GETTIME
- /* librt clock_gettime() is our first choice */
- struct timespec ts;
-
-#ifdef CLOCK_MONOTONIC
- clock_gettime (CLOCK_MONOTONIC, &ts);
-#else
- clock_gettime (CLOCK_REALTIME, &ts);
-#endif
-
- /* In theory monotonic time can have any epoch.
- *
- * glib presently assumes the following:
- *
- * 1) The epoch comes some time after the birth of Jesus of Nazareth, but
- * not more than 10000 years later.
- *
- * 2) The current time also falls sometime within this range.
- *
- * These two reasonable assumptions leave us with a maximum deviation from
- * the epoch of 10000 years, or 315569520000000000 seconds.
- *
- * If we restrict ourselves to this range then the number of microseconds
- * will always fit well inside the constraints of a int64 (by a factor of
- * about 29).
- *
- * If you actually hit the following assertion, probably you should file a
- * bug against your operating system for being excessively silly.
- **/
- g_assert (G_GINT64_CONSTANT (-315569520000000000) < ts.tv_sec &&
- ts.tv_sec < G_GINT64_CONSTANT (315569520000000000));
-
- return (((gint64) ts.tv_sec) * 1000000) + (ts.tv_nsec / 1000);
-
-#elif defined (G_OS_WIN32)
guint64 ticks;
guint32 ticks32;
* is to use it to interpolate the lower precision clocks. Firefox does something like
* this:
* https://bugzilla.mozilla.org/show_bug.cgi?id=363258
- *
+ *
* However this seems quite complicated, so we're not doing this right now.
*
* The approach we take instead is to use the TGT timer, extending it to 64bit
* This means that:
* - We have a globally consistent monotonic clock on Vista and later
* - We have a locally monotonic clock on XP
- * - Apps that need higher precision in timeouts and clock reads can call
+ * - Apps that need higher precision in timeouts and clock reads can call
* timeBeginPeriod() to increase it as much as they want
*/
ticks = g_GetTickCount64 ();
ticks32 = timeGetTime();
- /* GTC64 and TGT are sampled at different times, however they
- * have the same base and source (msecs since system boot).
+ /* GTC64 and TGT are sampled at different times, however they
+ * have the same base and source (msecs since system boot).
* They can differ by as much as -16 to +16 msecs.
- * We can't just inject the low bits into the 64bit counter
+ * We can't just inject the low bits into the 64bit counter
* as one of the counters can have wrapped in 32bit space and
* the other not. Instead we calculate the signed difference
* in 32bit space and apply that difference to the 64bit counter.
/* We could do some 2's complement hack, but we play it safe */
if (ticks32 - ticks_as_32bit <= G_MAXINT32)
- ticks += ticks32 - ticks_as_32bit;
+ ticks += ticks32 - ticks_as_32bit;
else
- ticks -= ticks_as_32bit - ticks32;
+ ticks -= ticks_as_32bit - ticks32;
}
else
{
* processes.
*/
if ((ticks32 >> 31) != (epoch & 1))
- {
- epoch++;
- g_atomic_int_set (&g_win32_tick_epoch, epoch);
- }
+ {
+ epoch++;
+ g_atomic_int_set (&g_win32_tick_epoch, epoch);
+ }
ticks = (guint64)ticks32 | ((guint64)epoch) << 31;
}
return ticks * 1000;
+}
+#elif defined(HAVE_MACH_MACH_TIME_H) /* Mac OS */
+gint64
+g_get_monotonic_time (void)
+{
+ static mach_timebase_info_data_t timebase_info;
-#else /* !HAVE_CLOCK_GETTIME && ! G_OS_WIN32*/
+ if (timebase_info.denom == 0)
+ {
+ /* This is a fraction that we must use to scale
+ * mach_absolute_time() by in order to reach nanoseconds.
+ *
+ * We've only ever observed this to be 1/1, but maybe it could be
+ * 1000/1 if mach time is microseconds already, or 1/1000 if
+ * picoseconds. Try to deal nicely with that.
+ */
+ mach_timebase_info (&timebase_info);
- GTimeVal tv;
+ /* We actually want microseconds... */
+ if (timebase_info.numer % 1000 == 0)
+ timebase_info.numer /= 1000;
+ else
+ timebase_info.denom *= 1000;
- g_get_current_time (&tv);
+ /* We want to make the numer 1 to avoid having to multiply... */
+ if (timebase_info.denom % timebase_info.numer == 0)
+ {
+ timebase_info.denom /= timebase_info.numer;
+ timebase_info.numer = 1;
+ }
+ else
+ {
+ /* We could just multiply by timebase_info.numer below, but why
+ * bother for a case that may never actually exist...
+ *
+ * Plus -- performing the multiplication would risk integer
+ * overflow. If we ever actually end up in this situation, we
+ * should more carefully evaluate the correct course of action.
+ */
+ mach_timebase_info (&timebase_info); /* Get a fresh copy for a better message */
+ g_error ("Got weird mach timebase info of %d/%d. Please file a bug against GLib.",
+ timebase_info.numer, timebase_info.denom);
+ }
+ }
- return (((gint64) tv.tv_sec) * 1000000) + tv.tv_usec;
-#endif
+ return mach_absolute_time () / timebase_info.denom;
}
+#else
+gint64
+g_get_monotonic_time (void)
+{
+ struct timespec ts;
+ gint result;
+
+ result = clock_gettime (CLOCK_MONOTONIC, &ts);
+
+ if G_UNLIKELY (result != 0)
+ g_error ("GLib requires working CLOCK_MONOTONIC");
+
+ return (((gint64) ts.tv_sec) * 1000000) + (ts.tv_nsec / 1000);
+}
+#endif
static void
g_main_dispatch_free (gpointer dispatch)
* This function is useful in a situation like the following:
* Imagine an extremely simple "garbage collected" system.
*
- * |[
+ * |[<!-- language="C" -->
* static GList *free_list;
*
* gpointer
* doesn't work, since the idle function could be called from a
* recursive callback. This can be fixed by using g_main_depth()
*
- * |[
+ * |[<!-- language="C" -->
* gpointer
* allocate_memory (gsize size)
* {
* many things that the user could do. Instead, you can use the
* following techniques:
*
- * <orderedlist>
- * <listitem>
- * <para>
- * Use gtk_widget_set_sensitive() or modal dialogs to prevent
- * the user from interacting with elements while the main
- * loop is recursing.
- * </para>
- * </listitem>
- * <listitem>
- * <para>
- * Avoid main loop recursion in situations where you can't handle
- * arbitrary callbacks. Instead, structure your code so that you
- * simply return to the main loop and then get called again when
- * there is more work to do.
- * </para>
- * </listitem>
- * </orderedlist>
+ * 1. Use gtk_widget_set_sensitive() or modal dialogs to prevent
+ * the user from interacting with elements while the main
+ * loop is recursing.
*
- * Return value: The main loop recursion level in the current thread
- **/
+ * 2. Avoid main loop recursion in situations where you can't handle
+ * arbitrary callbacks. Instead, structure your code so that you
+ * simply return to the main loop and then get called again when
+ * there is more work to do.
+ *
+ * Returns: The main loop recursion level in the current thread
+ */
int
g_main_depth (void)
{
*
* Returns the currently firing source for this thread.
*
- * Return value: (transfer none): The currently firing source or %NULL.
+ * Returns: (transfer none): The currently firing source or %NULL.
*
* Since: 2.12
*/
g_main_current_source (void)
{
GMainDispatch *dispatch = get_dispatch ();
- return dispatch->dispatching_sources ? dispatch->dispatching_sources->data : NULL;
+ return dispatch->source;
}
/**
* from within idle handlers, but may have freed the object
* before the dispatch of your idle handler.
*
- * |[
+ * |[<!-- language="C" -->
* static gboolean
* idle_callback (gpointer data)
* {
* SomeWidget *self = data;
*
- * GDK_THREADS_ENTER (<!-- -->);
- * /<!-- -->* do stuff with self *<!-- -->/
+ * GDK_THREADS_ENTER ();
+ * // do stuff with self
* self->idle_id = 0;
- * GDK_THREADS_LEAVE (<!-- -->);
+ * GDK_THREADS_LEAVE ();
*
* return G_SOURCE_REMOVE;
* }
* this particular problem, is to check to if the source
* has already been destroy within the callback.
*
- * |[
+ * |[<!-- language="C" -->
* static gboolean
* idle_callback (gpointer data)
* {
* GDK_THREADS_ENTER ();
* if (!g_source_is_destroyed (g_main_current_source ()))
* {
- * /<!-- -->* do stuff with self *<!-- -->/
+ * // do stuff with self
* }
* GDK_THREADS_LEAVE ();
*
* }
* ]|
*
- * Return value: %TRUE if the source has been destroyed
+ * Returns: %TRUE if the source has been destroyed
*
* Since: 2.12
*/
source->flags |= G_SOURCE_BLOCKED;
- tmp_list = source->poll_fds;
- while (tmp_list)
+ if (source->context)
{
- g_main_context_remove_poll_unlocked (source->context, tmp_list->data);
- tmp_list = tmp_list->next;
+ tmp_list = source->poll_fds;
+ while (tmp_list)
+ {
+ g_main_context_remove_poll_unlocked (source->context, tmp_list->data);
+ tmp_list = tmp_list->next;
+ }
+
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ g_main_context_remove_poll_unlocked (source->context, tmp_list->data);
}
if (source->priv && source->priv->child_sources)
unblock_source (GSource *source)
{
GSList *tmp_list;
-
+
g_return_if_fail (SOURCE_BLOCKED (source)); /* Source already unblocked */
g_return_if_fail (!SOURCE_DESTROYED (source));
tmp_list = tmp_list->next;
}
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ g_main_context_add_poll_unlocked (source->context, source->priority, tmp_list->data);
+
if (source->priv && source->priv->child_sources)
{
tmp_list = source->priv->child_sources;
gboolean (*dispatch) (GSource *,
GSourceFunc,
gpointer);
- GSList current_source_link;
+ GSource *prev_source;
dispatch = source->source_funcs->dispatch;
cb_funcs = source->callback_funcs;
UNLOCK_CONTEXT (context);
- current->depth++;
- /* The on-stack allocation of the GSList is unconventional, but
- * we know that the lifetime of the link is bounded to this
- * function as the link is kept in a thread specific list and
- * not manipulated outside of this function and its descendants.
- * Avoiding the overhead of a g_slist_alloc() is useful as many
- * applications do little more than dispatch events.
- *
- * This is a performance hack - do not revert to g_slist_prepend()!
- */
- current_source_link.data = source;
- current_source_link.next = current->dispatching_sources;
- current->dispatching_sources = ¤t_source_link;
- need_destroy = ! dispatch (source,
- callback,
- user_data);
- g_assert (current->dispatching_sources == ¤t_source_link);
- current->dispatching_sources = current_source_link.next;
- current->depth--;
-
+ /* These operations are safe because 'current' is thread-local
+ * and not modified from anywhere but this function.
+ */
+ prev_source = current->source;
+ current->source = source;
+ current->depth++;
+
+ TRACE( GLIB_MAIN_BEFORE_DISPATCH (g_source_get_name (source)));
+ need_destroy = !(* dispatch) (source, callback, user_data);
+ TRACE( GLIB_MAIN_AFTER_DISPATCH (g_source_get_name (source)));
+
+ current->source = prev_source;
+ current->depth--;
+
if (cb_funcs)
cb_funcs->unref (cb_data);
* can call g_main_context_prepare(), g_main_context_query(),
* g_main_context_check(), g_main_context_dispatch().
*
- * Return value: %TRUE if the operation succeeded, and
+ * Returns: %TRUE if the operation succeeded, and
* this thread is now the owner of @context.
**/
gboolean
* that owner releases ownership or until @cond is signaled, then
* try again (once) to become the owner.
*
- * Return value: %TRUE if the operation succeeded, and
+ * Returns: %TRUE if the operation succeeded, and
* this thread is now the owner of @context.
**/
gboolean
if (context == NULL)
context = g_main_context_default ();
+ if G_UNLIKELY (cond != &context->cond || mutex != &context->mutex)
+ {
+ static gboolean warned;
+
+ if (!warned)
+ {
+ g_critical ("WARNING!! g_main_context_wait() will be removed in a future release. "
+ "If you see this message, please file a bug immediately.");
+ warned = TRUE;
+ }
+ }
+
loop_internal_waiter = (mutex == &context->mutex);
if (!loop_internal_waiter)
* @context: a #GMainContext
* @priority: location to store priority of highest priority
* source already ready.
- *
+ *
* Prepares to poll sources within a main loop. The resulting information
* for polling is determined by calling g_main_context_query ().
- *
- * Return value: %TRUE if some source is ready to be dispatched
+ *
+ * You must have successfully acquired the context with
+ * g_main_context_acquire() before you may call this function.
+ *
+ * Returns: %TRUE if some source is ready to be dispatched
* prior to polling.
**/
gboolean
g_main_context_prepare (GMainContext *context,
gint *priority)
{
- gint i;
+ guint i;
gint n_ready = 0;
gint current_priority = G_MAXINT;
GSource *source;
* @fds: (out caller-allocates) (array length=n_fds): location to
* store #GPollFD records that need to be polled.
* @n_fds: length of @fds.
- *
+ *
* Determines information necessary to poll this main loop.
- *
- * Return value: the number of records actually stored in @fds,
+ *
+ * You must have successfully acquired the context with
+ * g_main_context_acquire() before you may call this function.
+ *
+ * Returns: the number of records actually stored in @fds,
* or, if more than @n_fds records need to be stored, the number
* of records that need to be stored.
**/
gint n_fds)
{
gint n_poll;
- GPollRec *pollrec;
+ GPollRec *pollrec, *lastpollrec;
+ gushort events;
LOCK_CONTEXT (context);
- pollrec = context->poll_records;
n_poll = 0;
- while (pollrec && max_priority >= pollrec->priority)
+ lastpollrec = NULL;
+ for (pollrec = context->poll_records; pollrec; pollrec = pollrec->next)
{
- /* We need to include entries with fd->events == 0 in the array because
- * otherwise if the application changes fd->events behind our back and
- * makes it non-zero, we'll be out of sync when we check the fds[] array.
- * (Changing fd->events after adding an FD wasn't an anticipated use of
- * this API, but it occurs in practice.) */
- if (n_poll < n_fds)
- {
- fds[n_poll].fd = pollrec->fd->fd;
- /* In direct contradiction to the Unix98 spec, IRIX runs into
- * difficulty if you pass in POLLERR, POLLHUP or POLLNVAL
- * flags in the events field of the pollfd while it should
- * just ignoring them. So we mask them out here.
- */
- fds[n_poll].events = pollrec->fd->events & ~(G_IO_ERR|G_IO_HUP|G_IO_NVAL);
- fds[n_poll].revents = 0;
- }
+ if (pollrec->priority > max_priority)
+ continue;
- pollrec = pollrec->next;
- n_poll++;
+ /* In direct contradiction to the Unix98 spec, IRIX runs into
+ * difficulty if you pass in POLLERR, POLLHUP or POLLNVAL
+ * flags in the events field of the pollfd while it should
+ * just ignoring them. So we mask them out here.
+ */
+ events = pollrec->fd->events & ~(G_IO_ERR|G_IO_HUP|G_IO_NVAL);
+
+ if (lastpollrec && pollrec->fd->fd == lastpollrec->fd->fd)
+ {
+ if (n_poll - 1 < n_fds)
+ fds[n_poll - 1].events |= events;
+ }
+ else
+ {
+ if (n_poll < n_fds)
+ {
+ fds[n_poll].fd = pollrec->fd->fd;
+ fds[n_poll].events = events;
+ fds[n_poll].revents = 0;
+ }
+
+ n_poll++;
+ }
+
+ lastpollrec = pollrec;
}
context->poll_changed = FALSE;
* @fds: (array length=n_fds): array of #GPollFD's that was passed to
* the last call to g_main_context_query()
* @n_fds: return value of g_main_context_query()
- *
+ *
* Passes the results of polling back to the main loop.
- *
- * Return value: %TRUE if some sources are ready to be dispatched.
+ *
+ * You must have successfully acquired the context with
+ * g_main_context_acquire() before you may call this function.
+ *
+ * Returns: %TRUE if some sources are ready to be dispatched.
**/
gboolean
g_main_context_check (GMainContext *context,
UNLOCK_CONTEXT (context);
return FALSE;
}
-
+
pollrec = context->poll_records;
i = 0;
- while (i < n_fds)
+ while (pollrec && i < n_fds)
{
- if (pollrec->fd->events)
- pollrec->fd->revents = fds[i].revents;
+ while (pollrec && pollrec->fd->fd == fds[i].fd)
+ {
+ if (pollrec->priority <= max_priority)
+ {
+ pollrec->fd->revents =
+ fds[i].revents & (pollrec->fd->events | G_IO_ERR | G_IO_HUP | G_IO_NVAL);
+ }
+ pollrec = pollrec->next;
+ }
- pollrec = pollrec->next;
i++;
}
else
result = FALSE;
+ if (result == FALSE)
+ {
+ GSList *tmp_list;
+
+ /* If not already explicitly flagged ready by ->check()
+ * (or if we have no check) then we can still be ready if
+ * any of our fds poll as ready.
+ */
+ for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
+ {
+ GPollFD *pollfd = tmp_list->data;
+
+ if (pollfd->revents)
+ {
+ result = TRUE;
+ break;
+ }
+ }
+ }
+
if (result == FALSE && source->priv->ready_time != -1)
{
if (!context->time_is_fresh)
/**
* g_main_context_dispatch:
* @context: a #GMainContext
- *
+ *
* Dispatches all pending sources.
+ *
+ * You must have successfully acquired the context with
+ * g_main_context_acquire() before you may call this function.
**/
void
g_main_context_dispatch (GMainContext *context)
*
* Checks if any sources have pending events for the given context.
*
- * Return value: %TRUE if events are pending.
+ * Returns: %TRUE if events are pending.
**/
gboolean
g_main_context_pending (GMainContext *context)
* g_main_context_iteration() to return %FALSE, since the wait may
* be interrupted for other reasons than an event source becoming ready.
*
- * Return value: %TRUE if events were dispatched.
+ * Returns: %TRUE if events were dispatched.
**/
gboolean
g_main_context_iteration (GMainContext *context, gboolean may_block)
*
* Creates a new #GMainLoop structure.
*
- * Return value: a new #GMainLoop.
+ * Returns: a new #GMainLoop.
**/
GMainLoop *
g_main_loop_new (GMainContext *context,
*
* Increases the reference count on a #GMainLoop object by one.
*
- * Return value: @loop
+ * Returns: @loop
**/
GMainLoop *
g_main_loop_ref (GMainLoop *loop)
*
* Checks to see if the main loop is currently being run via g_main_loop_run().
*
- * Return value: %TRUE if the mainloop is currently being run.
+ * Returns: %TRUE if the mainloop is currently being run.
**/
gboolean
g_main_loop_is_running (GMainLoop *loop)
*
* Returns the #GMainContext of @loop.
*
- * Return value: (transfer none): the #GMainContext of @loop
+ * Returns: (transfer none): the #GMainContext of @loop
**/
GMainContext *
g_main_loop_get_context (GMainLoop *loop)
if (n_fds || timeout != 0)
{
#ifdef G_MAIN_POLL_DEBUG
+ poll_timer = NULL;
if (_g_main_poll_debug)
{
g_print ("polling context=%p n=%d timeout=%d\n",
* @priority: the priority for this file descriptor which should be
* the same as the priority used for g_source_attach() to ensure that the
* file descriptor is polled whenever the results may be needed.
- *
+ *
* Adds a file descriptor to the set of file descriptors polled for
* this context. This will very seldom be used directly. Instead
- * a typical event source will use g_source_add_poll() instead.
+ * a typical event source will use g_source_add_unix_fd() instead.
**/
void
g_main_context_add_poll (GMainContext *context,
newrec->fd = fd;
newrec->priority = priority;
- prevrec = context->poll_records_tail;
- nextrec = NULL;
- while (prevrec && priority < prevrec->priority)
+ prevrec = NULL;
+ nextrec = context->poll_records;
+ while (nextrec)
{
- nextrec = prevrec;
- prevrec = prevrec->prev;
+ if (nextrec->fd->fd > fd->fd)
+ break;
+ prevrec = nextrec;
+ nextrec = nextrec->next;
}
if (prevrec)
if (nextrec)
nextrec->prev = newrec;
- else
- context->poll_records_tail = newrec;
context->n_poll_records++;
if (nextrec != NULL)
nextrec->prev = prevrec;
- else
- context->poll_records_tail = prevrec;
g_slice_free (GPollRec, pollrec);
*
* Gets the poll function set by g_main_context_set_poll_func().
*
- * Return value: the poll function
+ * Returns: the poll function
**/
GPollFunc
g_main_context_get_poll_func (GMainContext *context)
* g_main_context_wakeup:
* @context: a #GMainContext
*
- * If @context is currently waiting in a poll(), interrupt
- * the poll(), and continue the iteration process.
+ * If @context is currently blocking in g_main_context_iteration()
+ * waiting for a source to become ready, cause it to stop blocking
+ * and return. Otherwise, cause the next invocation of
+ * g_main_context_iteration() to return without blocking.
+ *
+ * This API is useful for low-level control over #GMainContext; for
+ * example, integrating it with main loop implementations such as
+ * #GMainLoop.
+ *
+ * Another related use for this function is when implementing a main
+ * loop with a termination condition, computed from multiple threads:
+ *
+ * |[<!-- language="C" -->
+ * #define NUM_TASKS 10
+ * static volatile gint tasks_remaining = NUM_TASKS;
+ * ...
+ *
+ * while (g_atomic_int_get (&tasks_remaining) != 0)
+ * g_main_context_iteration (NULL, TRUE);
+ * ]|
+ *
+ * Then in a thread:
+ * |[<!-- language="C" -->
+ * perform_work();
+ *
+ * if (g_atomic_int_dec_and_test (&tasks_remaining))
+ * g_main_context_wakeup (NULL);
+ * ]|
**/
void
g_main_context_wakeup (GMainContext *context)
* The interval given is in terms of monotonic time, not wall clock
* time. See g_get_monotonic_time().
*
- * Return value: the newly-created timeout source
+ * Returns: the newly-created timeout source
**/
GSource *
g_timeout_source_new (guint interval)
* The interval given in terms of monotonic time, not wall clock time.
* See g_get_monotonic_time().
*
- * Return value: the newly-created timeout source
+ * Returns: the newly-created timeout source
*
* Since: 2.14
**/
* The interval given in terms of monotonic time, not wall clock time.
* See g_get_monotonic_time().
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
* Rename to: g_timeout_add
**/
guint
* The interval given is in terms of monotonic time, not wall clock
* time. See g_get_monotonic_time().
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
**/
guint
g_timeout_add (guint32 interval,
* The interval given is in terms of monotonic time, not wall clock
* time. See g_get_monotonic_time().
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
*
* Rename to: g_timeout_add_seconds
* Since: 2.14
* The interval given is in terms of monotonic time, not wall clock
* time. See g_get_monotonic_time().
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
*
* Since: 2.14
**/
}
static void
-dispatch_unix_signals (void)
+dispatch_unix_signals_unlocked (void)
{
+ gboolean pending[NSIG];
GSList *node;
+ gint i;
/* clear this first incase another one arrives while we're processing */
any_unix_signal_pending = FALSE;
- G_LOCK(unix_signal_lock);
+ /* We atomically test/clear the bit from the global array in case
+ * other signals arrive while we are dispatching.
+ *
+ * We then can safely use our own array below without worrying about
+ * races.
+ */
+ for (i = 0; i < NSIG; i++)
+ {
+ /* Be very careful with (the volatile) unix_signal_pending.
+ *
+ * We must ensure that it's not possible that we clear it without
+ * handling the signal. We therefore must ensure that our pending
+ * array has a field set (ie: we will do something about the
+ * signal) before we clear the item in unix_signal_pending.
+ *
+ * Note specifically: we must check _our_ array.
+ */
+ pending[i] = unix_signal_pending[i];
+ if (pending[i])
+ unix_signal_pending[i] = FALSE;
+ }
/* handle GChildWatchSource instances */
- if (unix_signal_pending[SIGCHLD])
+ if (pending[SIGCHLD])
{
- unix_signal_pending[SIGCHLD] = FALSE;
-
/* The only way we can do this is to scan all of the children.
*
* The docs promise that we will not reap children that we are not
pid_t pid;
do
{
+ g_assert (source->pid > 0);
+
pid = waitpid (source->pid, &source->child_status, WNOHANG);
if (pid > 0)
{
if (!source->pending)
{
- if (unix_signal_pending[source->signum])
+ if (pending[source->signum])
{
- unix_signal_pending[source->signum] = FALSE;
source->pending = TRUE;
wake_source ((GSource *) source);
}
}
+}
+
+static void
+dispatch_unix_signals (void)
+{
+ G_LOCK(unix_signal_lock);
+ dispatch_unix_signals_unlocked ();
G_UNLOCK(unix_signal_lock);
}
}
static void
-ensure_unix_signal_handler_installed_unlocked (int signum)
+ref_unix_signal_handler_unlocked (int signum)
{
- static sigset_t installed_signal_mask;
- static gboolean initialized;
- struct sigaction action;
-
- if (!initialized)
+ /* Ensure we have the worker context */
+ g_get_worker_context ();
+ unix_signal_refcount[signum]++;
+ if (unix_signal_refcount[signum] == 1)
{
- sigemptyset (&installed_signal_mask);
- g_get_worker_context ();
- initialized = TRUE;
+ struct sigaction action;
+ action.sa_handler = g_unix_signal_handler;
+ sigemptyset (&action.sa_mask);
+#ifdef SA_RESTART
+ action.sa_flags = SA_RESTART | SA_NOCLDSTOP;
+#else
+ action.sa_flags = SA_NOCLDSTOP;
+#endif
+ sigaction (signum, &action, NULL);
}
+}
- if (sigismember (&installed_signal_mask, signum))
- return;
-
- sigaddset (&installed_signal_mask, signum);
-
- action.sa_handler = g_unix_signal_handler;
- sigemptyset (&action.sa_mask);
- action.sa_flags = SA_RESTART | SA_NOCLDSTOP;
- sigaction (signum, &action, NULL);
+static void
+unref_unix_signal_handler_unlocked (int signum)
+{
+ unix_signal_refcount[signum]--;
+ if (unix_signal_refcount[signum] == 0)
+ {
+ struct sigaction action;
+ memset (&action, 0, sizeof (action));
+ action.sa_handler = SIG_DFL;
+ sigemptyset (&action.sa_mask);
+ sigaction (signum, &action, NULL);
+ }
}
GSource *
unix_signal_source->pending = FALSE;
G_LOCK (unix_signal_lock);
- ensure_unix_signal_handler_installed_unlocked (signum);
+ ref_unix_signal_handler_unlocked (signum);
unix_signal_watches = g_slist_prepend (unix_signal_watches, unix_signal_source);
- if (unix_signal_pending[signum])
- unix_signal_source->pending = TRUE;
- unix_signal_pending[signum] = FALSE;
+ dispatch_unix_signals_unlocked ();
G_UNLOCK (unix_signal_lock);
return source;
static void
g_unix_signal_watch_finalize (GSource *source)
{
+ GUnixSignalWatchSource *unix_signal_source;
+
+ unix_signal_source = (GUnixSignalWatchSource *) source;
+
G_LOCK (unix_signal_lock);
+ unref_unix_signal_handler_unlocked (unix_signal_source->signum);
unix_signal_watches = g_slist_remove (unix_signal_watches, source);
G_UNLOCK (unix_signal_lock);
}
{
G_LOCK (unix_signal_lock);
unix_child_watches = g_slist_remove (unix_child_watches, source);
+ unref_unix_signal_handler_unlocked (SIGCHLD);
G_UNLOCK (unix_signal_lock);
}
/**
* g_child_watch_source_new:
- * @pid: process to watch. On POSIX the pid of a child process. On
+ * @pid: process to watch. On POSIX the positive pid of a child process. On
* Windows a handle for a process (which doesn't have to be a child).
*
* Creates a new child_watch source.
* executed.
*
* Note that child watch sources can only be used in conjunction with
- * <literal>g_spawn...</literal> when the %G_SPAWN_DO_NOT_REAP_CHILD
- * flag is used.
+ * `g_spawn...` when the %G_SPAWN_DO_NOT_REAP_CHILD flag is used.
*
* Note that on platforms where #GPid must be explicitly closed
* (see g_spawn_close_pid()) @pid must not be closed while the
* g_spawn_close_pid() in the callback function for the source.
*
* Note further that using g_child_watch_source_new() is not
- * compatible with calling <literal>waitpid</literal> with a
- * nonpositive first argument in the application. Calling waitpid()
- * for individual pids will still work fine.
- *
- * Return value: the newly-created child watch source
+ * compatible with calling `waitpid` with a nonpositive first
+ * argument in the application. Calling waitpid() for individual
+ * pids will still work fine.
+ *
+ * Similarly, on POSIX platforms, the @pid passed to this function must
+ * be greater than 0 (i.e. this function must wait for a specific child,
+ * and cannot wait for one of many children by using a nonpositive argument).
+ *
+ * Returns: the newly-created child watch source
*
* Since: 2.4
**/
GSource *
g_child_watch_source_new (GPid pid)
{
- GSource *source = g_source_new (&g_child_watch_funcs, sizeof (GChildWatchSource));
- GChildWatchSource *child_watch_source = (GChildWatchSource *)source;
+ GSource *source;
+ GChildWatchSource *child_watch_source;
+
+#ifndef G_OS_WIN32
+ g_return_val_if_fail (pid > 0, NULL);
+#endif
+
+ source = g_source_new (&g_child_watch_funcs, sizeof (GChildWatchSource));
+ child_watch_source = (GChildWatchSource *)source;
child_watch_source->pid = pid;
g_source_add_poll (source, &child_watch_source->poll);
#else /* G_OS_WIN32 */
G_LOCK (unix_signal_lock);
- ensure_unix_signal_handler_installed_unlocked (SIGCHLD);
+ ref_unix_signal_handler_unlocked (SIGCHLD);
unix_child_watches = g_slist_prepend (unix_child_watches, child_watch_source);
if (waitpid (pid, &child_watch_source->child_status, WNOHANG) > 0)
child_watch_source->child_exited = TRUE;
* g_child_watch_add_full:
* @priority: the priority of the idle source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
- * @pid: process to watch. On POSIX the pid of a child process. On
+ * @pid: process to watch. On POSIX the positive pid of a child process. On
* Windows a handle for a process (which doesn't have to be a child).
* @function: function to call
* @data: data to pass to @function
* using g_source_attach(). You can do these steps manually if you
* need greater control.
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
*
* Rename to: g_child_watch_add
* Since: 2.4
guint id;
g_return_val_if_fail (function != NULL, 0);
+#ifndef G_OS_WIN32
+ g_return_val_if_fail (pid > 0, 0);
+#endif
source = g_child_watch_source_new (pid);
/**
* g_child_watch_add:
- * @pid: process id to watch. On POSIX the pid of a child process. On
- * Windows a handle for a process (which doesn't have to be a child).
+ * @pid: process id to watch. On POSIX the positive pid of a child
+ * process. On Windows a handle for a process (which doesn't have to be
+ * a child).
* @function: function to call
* @data: data to pass to @function
*
* using g_source_attach(). You can do these steps manually if you
* need greater control.
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
*
* Since: 2.4
**/
* %G_PRIORITY_DEFAULT_IDLE, as compared to other sources which
* have a default priority of %G_PRIORITY_DEFAULT.
*
- * Return value: the newly-created idle source
+ * Returns: the newly-created idle source
**/
GSource *
g_idle_source_new (void)
* and attaches it to the main loop context using g_source_attach().
* You can do these steps manually if you need greater control.
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
* Rename to: g_idle_add
**/
guint
* and attaches it to the main loop context using g_source_attach().
* You can do these steps manually if you need greater control.
*
- * Return value: the ID (greater than 0) of the event source.
+ * Returns: the ID (greater than 0) of the event source.
**/
guint
g_idle_add (GSourceFunc function,
*
* Removes the idle function with the given data.
*
- * Return value: %TRUE if an idle source was found and removed.
+ * Returns: %TRUE if an idle source was found and removed.
**/
gboolean
g_idle_remove_by_data (gpointer data)
projects / platform / upstream / glib.git / blobdiff