diff options
Diffstat (limited to 'elf/dl-close.c')
| -rw-r--r-- | elf/dl-close.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/elf/dl-close.c b/elf/dl-close.c index c51becd..3720e47 100644 --- a/elf/dl-close.c +++ b/elf/dl-close.c @@ -79,9 +79,10 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp, { assert (old_map->l_tls_modid == idx); - /* Mark the entry as unused. */ - listp->slotinfo[idx - disp].gen = GL(dl_tls_generation) + 1; - listp->slotinfo[idx - disp].map = NULL; + /* Mark the entry as unused. These can be read concurrently. */ + atomic_store_relaxed (&listp->slotinfo[idx - disp].gen, + GL(dl_tls_generation) + 1); + atomic_store_relaxed (&listp->slotinfo[idx - disp].map, NULL); } /* If this is not the last currently used entry no need to look @@ -96,8 +97,8 @@ remove_slotinfo (size_t idx, struct dtv_slotinfo_list *listp, size_t disp, if (listp->slotinfo[idx - disp].map != NULL) { - /* Found a new last used index. */ - GL(dl_tls_max_dtv_idx) = idx; + /* Found a new last used index. This can be read concurrently. */ + atomic_store_relaxed (&GL(dl_tls_max_dtv_idx), idx); return true; } } @@ -571,7 +572,9 @@ _dl_close_worker (struct link_map *map, bool force) GL(dl_tls_dtv_slotinfo_list), 0, imap->l_init_called)) /* All dynamically loaded modules with TLS are unloaded. */ - GL(dl_tls_max_dtv_idx) = GL(dl_tls_static_nelem); + /* Can be read concurrently. */ + atomic_store_relaxed (&GL(dl_tls_max_dtv_idx), + GL(dl_tls_static_nelem)); if (imap->l_tls_offset != NO_TLS_OFFSET && imap->l_tls_offset != FORCED_DYNAMIC_TLS_OFFSET) @@ -769,8 +772,11 @@ _dl_close_worker (struct link_map *map, bool force) /* If we removed any object which uses TLS bump the generation counter. */ if (any_tls) { - if (__glibc_unlikely (++GL(dl_tls_generation) == 0)) + size_t newgen = GL(dl_tls_generation) + 1; + if (__glibc_unlikely (newgen == 0)) _dl_fatal_printf ("TLS generation counter wrapped! Please report as described in "REPORT_BUGS_TO".\n"); + /* Can be read concurrently. */ + atomic_store_relaxed (&GL(dl_tls_generation), newgen); if (tls_free_end == GL(dl_tls_static_used)) GL(dl_tls_static_used) = tls_free_start; |