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8c104a01e1
There was a theoretical deadlock between the worker trying to emit a signal at the same time as we were waiting for it to shutdown the notification (while holding the lock). The deadlock was particularly annoying because we didn't really need to wait for the shutdown and because it wasn't possible to signals to arrive while waiting for a start. Attempting to deal with start and stop in an asymmetric way could have lead to other weird situations, however. Drop the lock while waiting for the worker thread to start. This means that we face the possibility of multiple waiters on the cond at the same time, so we need to make more of a state machine. https://bugzilla.gnome.org/show_bug.cgi?id=742599
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
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* Copyright © 2015 Canonical Limited
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the licence, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Ryan Lortie <desrt@desrt.ca>
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*/
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#ifndef __G_CONTEXT_SPECIFIC_GROUP_H__
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#define __G_CONTEXT_SPECIFIC_GROUP_H__
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#include <glib-object.h>
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typedef struct
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{
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GHashTable *table;
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GMutex lock;
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GCond cond;
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gboolean requested_state;
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GCallback requested_func;
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gboolean effective_state;
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} GContextSpecificGroup;
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gpointer
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g_context_specific_group_get (GContextSpecificGroup *group,
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GType type,
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goffset context_offset,
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GCallback start_func);
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void
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g_context_specific_group_remove (GContextSpecificGroup *group,
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GMainContext *context,
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gpointer instance,
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GCallback stop_func);
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void
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g_context_specific_group_emit (GContextSpecificGroup *group,
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guint signal_id);
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#endif /* __G_CONTEXT_SPECIFIC_GROUP_H__ */
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