diff options
Diffstat (limited to 'elf/dl-close.c')
| -rw-r--r-- | elf/dl-close.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/elf/dl-close.c b/elf/dl-close.c index 65de9e7809..5c7e5dad38 100644 --- a/elf/dl-close.c +++ b/elf/dl-close.c @@ -46,6 +46,9 @@ _dl_close (void *_map) struct link_map *map = _map; unsigned int i; unsigned int *new_opencount; +#ifdef USE_TLS + bool any_tls = false; +#endif /* First see whether we can remove the object at all. */ if (__builtin_expect (map->l_flags_1 & DF_1_NODELETE, 0) @@ -206,6 +209,28 @@ _dl_close (void *_map) --GL(dl_main_searchlist)->r_nlist; } +#ifdef USE_TLS + /* Remove the object from the dtv slotinfo array if it uses + TLS. */ + if (__builtin_expect (imap->l_tls_blocksize > 0, 0)) + { + /* Locate the entry in the slotinfo array. */ + size_t idx = imap->l_tls_modid; + struct dtv_slotinfo_list *listp = GL(dl_tls_dtv_slotinfo_list); + + while (idx >= listp->len) + { + idx -= listp->len; + listp = listp->next; + } + + listp->slotinfo[idx].gen = GL(dl_tls_generation) + 1; + listp->slotinfo[idx].map = NULL; + + any_tls = true; + } +#endif + /* We can unmap all the maps at once. We determined the start address and length when we loaded the object and the `munmap' call does the rest. */ @@ -279,6 +304,12 @@ _dl_close (void *_map) } } +#ifdef USE_TLS + /* If we removed any object which uses TLS bumnp the generation + counter. */ + ++GL(dl_tls_generation); +#endif + /* Notify the debugger those objects are finalized and gone. */ _r_debug.r_state = RT_CONSISTENT; _dl_debug_state (); @@ -302,6 +333,30 @@ _dl_close (void *_map) } +static bool +free_slotinfo (struct dtv_slotinfo_list *elemp) +{ + size_t cnt; + + if (elemp->next != NULL && !free_slotinfo (elemp->next)) + /* We cannot free the entry. */ + return false; + + /* The least we could do is remove next element (if there was any). */ + elemp->next = NULL; + + for (cnt = 0; cnt < elemp->len; ++cnt) + if (elemp->slotinfo[cnt].map != NULL) + /* Still used. */ + return false; + + /* We can remove the list element. */ + free (elemp); + + return true; +} + + static void free_mem (void) { @@ -320,5 +375,15 @@ free_mem (void) /* Now free the old map. */ free (old); } + +#ifdef USE_TLS + /* Free the memory allocated for the dtv slotinfo array. We can do + this only if all modules which used this memory are unloaded. + Also, the first element of the list does not have to be + deallocated. It was allocated in the dynamic linker (i.e., with + a different malloc). */ + if (free_slotinfo (GL(dl_tls_dtv_slotinfo_list)->next)) + GL(dl_tls_dtv_slotinfo_list)->next = NULL; +#endif } text_set_element (__libc_subfreeres, free_mem); |