diff options
Diffstat (limited to 'src/include/misc.h')
| -rw-r--r-- | src/include/misc.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/src/include/misc.h b/src/include/misc.h index 9161a215fdc..c84368b235c 100644 --- a/src/include/misc.h +++ b/src/include/misc.h @@ -1,5 +1,5 @@ /*- - * Copyright (c) 2014-2016 MongoDB, Inc. + * Copyright (c) 2014-2017 MongoDB, Inc. * Copyright (c) 2008-2014 WiredTiger, Inc. * All rights reserved. * @@ -276,3 +276,22 @@ union __wt_rand_state { uint32_t w, z; } x; }; + +/* + * WT_TAILQ_SAFE_REMOVE_BEGIN/END -- + * Macro to safely walk a TAILQ where we're expecting some underlying + * function to remove elements from the list, but we don't want to stop on + * error, nor do we want an error to turn into an infinite loop. Used during + * shutdown, when we're shutting down various lists. Unlike TAILQ_FOREACH_SAFE, + * this macro works even when the next element gets removed along with the + * current one. + */ +#define WT_TAILQ_SAFE_REMOVE_BEGIN(var, head, field, tvar) \ + for ((tvar) = NULL; ((var) = TAILQ_FIRST(head)) != NULL; \ + (tvar) = (var)) { \ + if ((tvar) == (var)) { \ + /* Leak the structure. */ \ + TAILQ_REMOVE(head, (var), field); \ + continue; \ + } +#define WT_TAILQ_SAFE_REMOVE_END } |