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Ensure the default purgeable zone is after the default zone on OS X

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Mike Hommey 2014-06-10 18:18:22 +09:00 committed by Jason Evans
parent 5921ba7b0c
commit 6f533c1903
1 changed files with 25 additions and 9 deletions
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34
src/zone.c
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@ -176,6 +176,7 @@ register_zone(void)
* register jemalloc's.
*/
malloc_zone_t *default_zone = malloc_default_zone();
malloc_zone_t *purgeable_zone = NULL;
if (!default_zone->zone_name ||
strcmp(default_zone->zone_name, "DefaultMallocZone") != 0) {
return;
@ -237,22 +238,37 @@ register_zone(void)
* run time.
*/
if (malloc_default_purgeable_zone != NULL)
malloc_default_purgeable_zone();
purgeable_zone = malloc_default_purgeable_zone();
/* Register the custom zone. At this point it won't be the default. */
malloc_zone_register(&zone);
/*
* Unregister and reregister the default zone. On OSX >= 10.6,
* unregistering takes the last registered zone and places it at the
* location of the specified zone. Unregistering the default zone thus
* makes the last registered one the default. On OSX < 10.6,
* unregistering shifts all registered zones. The first registered zone
* then becomes the default.
*/
do {
default_zone = malloc_default_zone();
/*
* Unregister and reregister the default zone. On OSX >= 10.6,
* unregistering takes the last registered zone and places it
* at the location of the specified zone. Unregistering the
* default zone thus makes the last registered one the default.
* On OSX < 10.6, unregistering shifts all registered zones.
* The first registered zone then becomes the default.
*/
malloc_zone_unregister(default_zone);
malloc_zone_register(default_zone);
/*
* On OSX 10.6, having the default purgeable zone appear before
* the default zone makes some things crash because it thinks it
* owns the default zone allocated pointers. We thus unregister/
* re-register it in order to ensure it's always after the
* default zone. On OSX < 10.6, there is no purgeable zone, so
* this does nothing. On OSX >= 10.6, unregistering replaces the
* purgeable zone with the last registered zone above, i.e the
* default zone. Registering it again then puts it at the end,
* obviously after the default zone.
*/
if (purgeable_zone) {
malloc_zone_unregister(purgeable_zone);
malloc_zone_register(purgeable_zone);
}
} while (malloc_default_zone() != &zone);
}