diff options
Diffstat (limited to 'src/backend/storage/ipc/shmem.c')
| -rw-r--r-- | src/backend/storage/ipc/shmem.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c index d9cd8850395..29ef5413c89 100644 --- a/src/backend/storage/ipc/shmem.c +++ b/src/backend/storage/ipc/shmem.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.80 2004/08/29 05:06:48 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.81 2004/09/28 20:46:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -262,8 +262,17 @@ InitShmemIndex(void) * shared memory hash table. * * We assume caller is doing some kind of synchronization - * so that two people dont try to create/initialize the + * so that two people don't try to create/initialize the * table at once. + * + * max_size is the estimated maximum number of hashtable entries. This is + * not a hard limit, but the access efficiency will degrade if it is + * exceeded substantially (since it's used to compute directory size and + * the hash table buckets will get overfull). + * + * init_size is the number of hashtable entries to preallocate. For a table + * whose maximum size is certain, this should be equal to max_size; that + * ensures that no run-time out-of-shared-memory failures can occur. */ HTAB * ShmemInitHash(const char *name, /* table string name for shmem index */ |