[evolution/wip/gsettings] Bug 628139 - Thread-safety issues in libical time zone loading

[Rodrigo Moya <rodrigo src gnome org>]

commit eea1fa0fd06487bd58ffc2bcc936b9c8719934c0
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun Oct 31 11:31:10 2010 -0400

    Bug 628139 - Thread-safety issues in libical time zone loading

 modules/calendar/e-cal-shell-backend.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/modules/calendar/e-cal-shell-backend.c b/modules/calendar/e-cal-shell-backend.c
index 134f706..749dd7e 100644
--- a/modules/calendar/e-cal-shell-backend.c
+++ b/modules/calendar/e-cal-shell-backend.c
@@ -769,8 +769,34 @@ cal_shell_backend_class_init (ECalShellBackendClass *class)
 static void
 cal_shell_backend_init (ECalShellBackend *cal_shell_backend)
 {
+	icalarray *builtin_timezones;
+	gint ii;
+
 	cal_shell_backend->priv =
 		E_CAL_SHELL_BACKEND_GET_PRIVATE (cal_shell_backend);
+
+	/* XXX Pre-load all built-in timezones in libical.
+	 *
+	 *     Built-in time zones in libical 0.43 are loaded on demand,
+	 *     but not in a thread-safe manner, resulting in a race when
+	 *     multiple threads call icaltimezone_load_builtin_timezone()
+	 *     on the same time zone.  Until built-in time zone loading
+	 *     in libical is made thread-safe, work around the issue by
+	 *     loading all built-in time zones now, so libical's internal
+	 *     time zone array will be fully populated before any threads
+	 *     are spawned.
+	 */
+	builtin_timezones = icaltimezone_get_builtin_timezones ();
+	for (ii = 0; ii < builtin_timezones->num_elements; ii++) {
+		icaltimezone *zone;
+
+		zone = icalarray_element_at (builtin_timezones, ii);
+
+		/* We don't care about the component right now,
+		 * we just need some function that will trigger
+		 * icaltimezone_load_builtin_timezone(). */
+		icaltimezone_get_component (zone);
+	}
 }
 
 GType