diff options
Diffstat (limited to 'src/backend/storage/ipc/shm_toc.c')
| -rw-r--r-- | src/backend/storage/ipc/shm_toc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/backend/storage/ipc/shm_toc.c b/src/backend/storage/ipc/shm_toc.c index 9110ffa4a0b..5e290df3366 100644 --- a/src/backend/storage/ipc/shm_toc.c +++ b/src/backend/storage/ipc/shm_toc.c @@ -208,6 +208,9 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address) /* * Look up a TOC entry. * + * If the key is not found, returns NULL if noError is true, otherwise + * throws elog(ERROR). + * * Unlike the other functions in this file, this operation acquires no lock; * it uses only barriers. It probably wouldn't hurt concurrency very much even * if it did get a lock, but since it's reasonably likely that a group of @@ -215,7 +218,7 @@ shm_toc_insert(shm_toc *toc, uint64 key, void *address) * right around the same time, there seems to be some value in avoiding it. */ void * -shm_toc_lookup(shm_toc *toc, uint64 key) +shm_toc_lookup(shm_toc *toc, uint64 key, bool noError) { uint64 nentry; uint64 i; @@ -226,10 +229,15 @@ shm_toc_lookup(shm_toc *toc, uint64 key) /* Now search for a matching entry. */ for (i = 0; i < nentry; ++i) + { if (toc->toc_entry[i].key == key) return ((char *) toc) + toc->toc_entry[i].offset; + } /* No matching entry was found. */ + if (!noError) + elog(ERROR, "could not find key " UINT64_FORMAT " in shm TOC at %p", + key, toc); return NULL; } |