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gtimezone: Cache UTC and local TZ indefinitely

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Previously, these GTimeZone objects were being cached in the `time_zones` cache, but dropped from it when their final ref was dropped (which was frequently). That meant additional reads of `/etc/localtime` next time they were created, which was noticeable on profiles. Keep a permanent ref to the UTC and local timezones.
This commit is contained in:
rim 2019-10-25 17:27:49 +00:00 committed by Philip Withnall
parent 5e17a98d19
commit 551e83662d
1 changed files with 31 additions and 2 deletions
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33
glib/gtimezone.c
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@ -37,6 +37,7 @@
#include "gslice.h"
#include "gdatetime.h"
#include "gdate.h"
#include "genviron.h"
#ifdef G_OS_WIN32
@ -196,6 +197,8 @@ struct _GTimeZone
G_LOCK_DEFINE_STATIC (time_zones);
static GHashTable/*<string?, GTimeZone>*/ *time_zones;
G_LOCK_DEFINE_STATIC (tz_local);
static GTimeZone *tz_local = NULL;
#define MIN_TZYEAR 1916 /* Daylight Savings started in WWI */
#define MAX_TZYEAR 2999 /* And it's not likely ever to go away, but
@ -1657,10 +1660,20 @@ g_time_zone_new (const gchar *identifier)
*
* Since: 2.26
**/
static gpointer
g_time_zone_utc_init (gpointer data)
{
return g_time_zone_new ("UTC");
}
GTimeZone *
g_time_zone_new_utc (void)
{
return g_time_zone_new ("UTC");
static GOnce utc_once = G_ONCE_INIT;
g_once (&utc_once, g_time_zone_utc_init, NULL);
return g_time_zone_ref ((GTimeZone *)utc_once.retval);
}
/**
@ -1683,7 +1696,23 @@ g_time_zone_new_utc (void)
GTimeZone *
g_time_zone_new_local (void)
{
return g_time_zone_new (getenv ("TZ"));
const gchar *tzenv = g_getenv ("TZ");
GTimeZone *tz;
G_LOCK (tz_local);
/* Is time zone changed and must be flushed? */
if (tz_local && g_strcmp0 (g_time_zone_get_identifier (tz_local), tzenv))
g_clear_pointer (&tz_local, g_time_zone_unref);
if (tz_local == NULL)
tz_local = g_time_zone_new (tzenv);
tz = g_time_zone_ref (tz_local);
G_UNLOCK (tz_local);
return tz;
}
/**