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nexedi
neoppod
Commits
cb07d772
Commit
cb07d772
authored
Aug 23, 2017
by
Kirill Smelkov
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.
parent
40256267
Changes
1
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1 changed file
with
16 additions
and
14 deletions
+16
-14
go/neo/client/cache.go
go/neo/client/cache.go
+16
-14
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go/neo/client/cache.go
View file @
cb07d772
...
...
@@ -88,16 +88,6 @@ type revCacheEntry struct {
ready
chan
struct
{}
// closed when loading finished
}
// loaded reports whether rce was already loaded
func
(
rce
*
revCacheEntry
)
loaded
()
bool
{
select
{
case
<-
rce
.
ready
:
return
true
default
:
return
false
}
}
// XXX doc
func
(
oce
*
oidCacheEntry
)
newRevEntry
(
before
zodb
.
Tid
)
*
revCacheEntry
{
rce
:=
&
revCacheEntry
{
...
...
@@ -135,12 +125,13 @@ func (oce *oidCacheEntry) del(rce *revCacheEntry) {
rce
.
revv
=
append
(
rce
.
revv
[
:
i
],
rce
.
revv
[
i
+
1
:
])
}
// lock order: Cache > cacheEntry > (?) revCacheEntry
// lock order: Cache.mu > oidCacheEntry > (?) revCacheEntry
// Cache.gcMu > ?
// XXX maintain nhit / nmiss?
func
(
c
*
cache
)
Load
(
xid
zodb
.
Xid
)
(
data
[]
byte
,
tid
Tid
,
err
error
)
{
// oid -> oce (oidCacheEntry) ; creat
ing new empty
if not yet there
// oid -> oce (oidCacheEntry) ; creat
e new empty oce
if not yet there
// exit with oce locked and cache.before read consistently
c
.
mu
.
RLock
()
...
...
@@ -152,6 +143,7 @@ func (c *cache) Load(xid zodb.Xid) (data []byte, tid Tid, err error) {
oce
.
Lock
()
c
.
mu
.
RUnlock
()
}
else
{
// relock cache in write mode to create oce
c
.
mu
.
RUnlock
()
c
.
mu
.
Lock
()
oce
=
c
.
entryMap
[
xid
.
Oid
]
...
...
@@ -166,7 +158,7 @@ func (c *cache) Load(xid zodb.Xid) (data []byte, tid Tid, err error) {
// oce, before -> rce (revCacheEntry)
var
rce
*
revCacheEntry
var
rceNew
bool
// whether
rce created
anew
var
rceNew
bool
// whether
we created rce
anew
if
xid
.
TidBefore
{
l
:=
len
(
oce
.
revv
)
...
...
@@ -252,7 +244,8 @@ func (c *cache) Load(xid zodb.Xid) (data []byte, tid Tid, err error) {
oce
.
Lock
()
i
:=
oce
.
find
(
rce
)
if
i
==
-
1
{
// rce was already dropped / evicted
// rce was already dropped by merge / evicted
// (XXX recheck about evicted)
oce
.
Unlock
()
return
rce
.
data
,
rce
.
serial
,
rce
.
err
}
...
...
@@ -337,6 +330,15 @@ func (c *cache) cleaner() {
}
// loaded reports whether rce was already loaded
func
(
rce
*
revCacheEntry
)
loaded
()
bool
{
select
{
case
<-
rce
.
ready
:
return
true
default
:
return
false
}
}
// revCacheEntry: .inLRU -> .
func
(
h
*
listHead
)
rceFromInLRU
()
(
rce
*
revCacheEntry
)
{
...
...
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