aboutsummaryrefslogtreecommitdiff
path: root/nptl/allocatestack.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>2007-05-19 07:08:23 +0000
committerUlrich Drepper <drepper@redhat.com>2007-05-19 07:08:23 +0000
commitdf94b6412e0628cd577da0ce5626358a3967ee44 (patch)
tree3b969d3e4175fe3a72f824c482d8c9f9a3b3bf3e /nptl/allocatestack.c
parent2acd01acb10d0c0113f87bf7e787e0854498269d (diff)
downloadglibc-df94b6412e0628cd577da0ce5626358a3967ee44.tar
glibc-df94b6412e0628cd577da0ce5626358a3967ee44.tar.gz
glibc-df94b6412e0628cd577da0ce5626358a3967ee44.tar.bz2
glibc-df94b6412e0628cd577da0ce5626358a3967ee44.zip
* elf/dl-close.c (_dl_close_worker): When removing object from
global scope, wait for all lookups to finish afterwards. * elf/dl-open.c (add_to_global): When global scope array must grow, allocate a new one and free old array only after all lookups finish. * elf/dl-runtime.c (_dl_fixup): Protect using global scope. (_dl_lookup_symbol_x): Likewise. * elf/dl-support.c: Define _dl_wait_lookup_done. * sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_wait_lookup_done.
Diffstat (limited to 'nptl/allocatestack.c')
-rw-r--r--nptl/allocatestack.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 6b60642042..e556dbac08 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -996,3 +996,60 @@ __pthread_init_static_tls (struct link_map *map)
lll_unlock (stack_cache_lock);
}
+
+
+void
+attribute_hidden
+__wait_lookup_done (void)
+{
+ lll_lock (stack_cache_lock);
+
+ struct pthread *self = THREAD_SELF;
+
+ /* Iterate over the list with system-allocated threads first. */
+ list_t *runp;
+ list_for_each (runp, &stack_used)
+ {
+ struct pthread *t = list_entry (runp, struct pthread, list);
+ if (t == self || t->header.gscope_flag == THREAD_GSCOPE_FLAG_UNUSED)
+ continue;
+
+ int *const gscope_flagp = &t->header.gscope_flag;
+
+ /* We have to wait until this thread is done with the global
+ scope. First tell the thread that we are waiting and
+ possibly have to be woken. */
+ if (atomic_compare_and_exchange_bool_acq (gscope_flagp,
+ THREAD_GSCOPE_FLAG_WAIT,
+ THREAD_GSCOPE_FLAG_USED))
+ continue;
+
+ do
+ lll_futex_wait (gscope_flagp, THREAD_GSCOPE_FLAG_WAIT);
+ while (*gscope_flagp == THREAD_GSCOPE_FLAG_WAIT);
+ }
+
+ /* Now the list with threads using user-allocated stacks. */
+ list_for_each (runp, &__stack_user)
+ {
+ struct pthread *t = list_entry (runp, struct pthread, list);
+ if (t == self || t->header.gscope_flag == THREAD_GSCOPE_FLAG_UNUSED)
+ continue;
+
+ int *const gscope_flagp = &t->header.gscope_flag;
+
+ /* We have to wait until this thread is done with the global
+ scope. First tell the thread that we are waiting and
+ possibly have to be woken. */
+ if (atomic_compare_and_exchange_bool_acq (gscope_flagp,
+ THREAD_GSCOPE_FLAG_WAIT,
+ THREAD_GSCOPE_FLAG_USED))
+ continue;
+
+ do
+ lll_futex_wait (gscope_flagp, THREAD_GSCOPE_FLAG_WAIT);
+ while (*gscope_flagp == THREAD_GSCOPE_FLAG_WAIT);
+ }
+
+ lll_unlock (stack_cache_lock);
+}