diff options
Diffstat (limited to 'malloc/arena.c')
| -rw-r--r-- | malloc/arena.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/malloc/arena.c b/malloc/arena.c index 3dab7bb..73bda84 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -805,6 +805,8 @@ _int_new_arena (size_t size) } +/* Remove an arena from free_list. The arena may be in use because it + was attached concurrently to a thread by reused_arena below. */ static mstate get_free_list (void) { @@ -818,10 +820,8 @@ get_free_list (void) { free_list = result->next_free; - /* Arenas on the free list are not attached to any thread. */ - assert (result->attached_threads == 0); - /* But the arena will now be attached to this thread. */ - result->attached_threads = 1; + /* The arena will be attached to this thread. */ + ++result->attached_threads; detach_arena (replaced_arena); } @@ -849,6 +849,8 @@ reused_arena (mstate avoid_arena) if (next_to_use == NULL) next_to_use = &main_arena; + /* Iterate over all arenas (including those linked from + free_list). */ result = next_to_use; do { @@ -883,6 +885,8 @@ reused_arena (mstate avoid_arena) (void) mutex_lock (&result->mutex); out: + /* Attach the arena to the current thread. Note that we may have + selected an arena which was on free_list. */ { mstate replaced_arena = thread_arena; (void) mutex_lock (&list_lock); |