diff options
Diffstat (limited to 'malloc/arena.c')
| -rw-r--r-- | malloc/arena.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/malloc/arena.c b/malloc/arena.c index b893baeb43..97c0b909cc 100644 --- a/malloc/arena.c +++ b/malloc/arena.c @@ -917,6 +917,27 @@ arena_get2(mstate a_tsd, size_t size, mstate avoid_arena) return a; } +/* If we don't have the main arena, then maybe the failure is due to running + out of mmapped areas, so we can try allocating on the main arena. + Otherwise, it is likely that sbrk() has failed and there is still a chance + to mmap(), so try one of the other arenas. */ +static mstate +arena_get_retry (mstate ar_ptr, size_t bytes) +{ + if(ar_ptr != &main_arena) { + (void)mutex_unlock(&ar_ptr->mutex); + ar_ptr = &main_arena; + (void)mutex_lock(&ar_ptr->mutex); + } else { + /* Grab ar_ptr->next prior to releasing its lock. */ + mstate prev = ar_ptr->next ? ar_ptr : 0; + (void)mutex_unlock(&ar_ptr->mutex); + ar_ptr = arena_get2(prev, bytes, ar_ptr); + } + + return ar_ptr; +} + #ifdef PER_THREAD static void __attribute__ ((section ("__libc_thread_freeres_fn"))) arena_thread_freeres (void) |