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malloc: Call tcache destructor in arena_thread_freeres

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It does not make sense to register separate cleanup functions for arena
and tcache since they're always going to be called together.  Call the
tcache cleanup function from within arena_thread_freeres since it at
least makes the order of those cleanups clear in the code.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer 2017-11-23 14:47:31 +01:00
parent 67f36c7922
commit 0a947e061d
3 changed files with 29 additions and 7 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2017-11-23 Florian Weimer <fweimer@redhat.com>
* malloc/malloc.c (tcache_thread_shutdown): Rename from
tcache_thread_freeres. Define for USE_TCACHE and !USE_TCACHE
alike. Remove freeres marker.
* malloc/arena.c (arena_thread_freeres): Call
tcache_thread_shutdown.
2017-11-23 Florian Weimer <fweimer@redhat.com>
[BZ #22459]

5
malloc/arena.c
View File

@ -944,6 +944,11 @@ arena_get_retry (mstate ar_ptr, size_t bytes)
static void __attribute__ ((section ("__libc_thread_freeres_fn")))
arena_thread_freeres (void)
{
/* Shut down the thread cache first. This could deallocate data for
the thread arena, so do this before we put the arena on the free
list. */
tcache_thread_shutdown ();
mstate a = thread_arena;
thread_arena = NULL;

23
malloc/malloc.c
View File

@ -1869,6 +1869,9 @@ void *weak_variable (*__memalign_hook)
= memalign_hook_ini;
void weak_variable (*__after_morecore_hook) (void) = NULL;
/* This function is called from the arena shutdown hook, to free the
thread cache (if it exists). */
static void tcache_thread_shutdown (void);
/* ------------------ Testing support ----------------------------------*/
@ -2938,8 +2941,8 @@ tcache_get (size_t tc_idx)
return (void *) e;
}
static void __attribute__ ((section ("__libc_thread_freeres_fn")))
tcache_thread_freeres (void)
static void
tcache_thread_shutdown (void)
{
int i;
tcache_perthread_struct *tcache_tmp = tcache;
@ -2965,7 +2968,6 @@ tcache_thread_freeres (void)
__libc_free (tcache_tmp);
}
text_set_element (__libc_thread_subfreeres, tcache_thread_freeres);
static void
tcache_init(void)
@ -3002,13 +3004,20 @@ tcache_init(void)
}
#define MAYBE_INIT_TCACHE() \
# define MAYBE_INIT_TCACHE() \
if (__glibc_unlikely (tcache == NULL)) \
tcache_init();
#else
#define MAYBE_INIT_TCACHE()
#endif
#else /* !USE_TCACHE */
# define MAYBE_INIT_TCACHE()
static void
tcache_thread_shutdown (void)
{
/* Nothing to do if there is no thread cache. */
}
#endif /* !USE_TCACHE */
void *
__libc_malloc (size_t bytes)