diff options
Diffstat (limited to 'src/backend/storage/buffer/README')
| -rw-r--r-- | src/backend/storage/buffer/README | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/src/backend/storage/buffer/README b/src/backend/storage/buffer/README index 498deb489d3..a2861b8db99 100644 --- a/src/backend/storage/buffer/README +++ b/src/backend/storage/buffer/README @@ -1,4 +1,4 @@ -$Header: /cvsroot/pgsql/src/backend/storage/buffer/README,v 1.2 2001/08/25 18:52:42 tgl Exp $ +$Header: /cvsroot/pgsql/src/backend/storage/buffer/README,v 1.3 2001/09/29 04:02:22 tgl Exp $ Notes about shared buffer access rules -------------------------------------- @@ -30,12 +30,10 @@ Buffer locks: there are two kinds of buffer locks, shared and exclusive, which act just as you'd expect: multiple backends can hold shared locks on the same buffer, but an exclusive lock prevents anyone else from holding either shared or exclusive lock. (These can alternatively be called READ -and WRITE locks.) These locks are short-term: they should not be held for -long. They are implemented as per-buffer spinlocks, so another backend -trying to acquire a competing lock will spin as long as you hold yours! -Buffer locks are acquired and released by LockBuffer(). It will *not* work -for a single backend to try to acquire multiple locks on the same buffer. -One must pin a buffer before trying to lock it. +and WRITE locks.) These locks are intended to be short-term: they should not +be held for long. Buffer locks are acquired and released by LockBuffer(). +It will *not* work for a single backend to try to acquire multiple locks on +the same buffer. One must pin a buffer before trying to lock it. Buffer access rules: |