diff options
Diffstat (limited to 'nptl/allocatestack.c')
| -rw-r--r-- | nptl/allocatestack.c | 59 |
1 files changed, 58 insertions, 1 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index c05cd47dff..736c63d69f 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. +/* Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -982,3 +982,60 @@ __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); +} |