Changeset: 62fa2c8d3cfe for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/62fa2c8d3cfe
Modified Files:
gdk/gdk_bbp.c
Branch: default
Log Message:
A view has a single physical reference on the parent (per heap).
No matter how many physical references there are on the view.
diffs (169 lines):
diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -2527,17 +2527,7 @@ BBPcacheit(BAT *bn, bool lock)
if (lock)
lock = locked_by == 0 || locked_by != MT_getpid();
- if (i) {
- assert(i > 0);
- } else {
- i = BBPinsert(bn); /* bat was not previously entered */
- if (i == 0)
- return GDK_FAIL;
- if (bn->theap)
- bn->theap->parentid = i;
- if (bn->tvheap)
- bn->tvheap->parentid = i;
- }
+ assert(i > 0);
if (lock)
MT_lock_set(&GDKswapLock(i));
@@ -2778,7 +2768,7 @@ static inline int
incref(bat i, bool logical, bool lock)
{
int refs;
- BAT *b, *pb = NULL, *pvb = NULL;
+ BAT *b;
if (!BBPcheck(i))
return 0;
@@ -2815,14 +2805,6 @@ incref(bat i, bool logical, bool lock)
if (lock)
MT_lock_unset(&GDKswapLock(i));
- if (!logical && refs > 1) {
- /* this wasn't the first physical reference, so undo
- * the fixes on the parent bats */
- if (pb)
- BBPunfix(pb->batCacheid);
- if (pvb)
- BBPunfix(pvb->batCacheid);
- }
return refs;
}
@@ -2833,16 +2815,7 @@ incref(bat i, bool logical, bool lock)
int
BBPfix(bat i)
{
- bool lock = locked_by == 0 || locked_by != MT_getpid();
-
- BAT *b = BBP_desc(i);
- if (b) {
- if (b->theap->parentid != b->batCacheid)
- (void) BBPfix(b->theap->parentid);
- if (b->tvheap && b->tvheap->parentid != b->batCacheid)
- (void) BBPfix(b->tvheap->parentid);
- }
- return incref(i, false, lock);
+ return BATdescriptor(i) ? 1 : 0;
}
/* increment the logical reference count for the given bat
@@ -2868,7 +2841,7 @@ BBPshare(bat parent)
assert(BBP_refs(parent) > 0);
if (lock)
MT_lock_unset(&GDKswapLock(parent));
- BBPfix(parent);
+ (void) BATdescriptor(parent);
}
static inline int
@@ -2929,10 +2902,10 @@ decref(bat i, bool logical, bool release
assert(b == NULL || b->theap == NULL ||
BBP_refs(b->theap->parentid) > 0);
assert(b == NULL || b->tvheap == NULL ||
BBP_refs(b->tvheap->parentid) > 0);
refs = --BBP_refs(i);
- if (b) {
+ if (b && refs == 0) {
tp = VIEWtparent(b);
tvp = VIEWvtparent(b);
- if (refs == 0 && (tp || tvp))
+ if (tp || tvp)
BBP_status_on(i, BBPHOT);
}
}
@@ -3075,39 +3048,54 @@ BATdescriptor(bat i)
BAT *b = NULL;
if (BBPcheck(i)) {
- for (;;) {
- MT_lock_set(&GDKswapLock(i));
- if (!(BBP_status(i) & (BBPUNSTABLE|BBPLOADING)))
- break;
- /* the BATs is "unstable", try again */
- MT_lock_unset(&GDKswapLock(i));
- BBPspin(i, __func__, BBPUNSTABLE|BBPLOADING);
+ bool lock = locked_by == 0 || locked_by != MT_getpid();
+ /* parent bats get a single fix for all physical
+ * references of a view and in order to do that
+ * properly, we must incref the parent bats always
+ * before our own incref, then after that decref them if
+ * we were not the first */
+ int tp = 0, tvp = 0;
+ if ((b = BBP_desc(i)) != NULL) {
+ MT_lock_set(&b->theaplock);
+ tp = b->theap->parentid;
+ tvp = b->tvheap ? b->tvheap->parentid : 0;
+ MT_lock_unset(&b->theaplock);
+ if (tp != i) {
+ if (BATdescriptor(tp) == NULL) {
+ return NULL;
+ }
+ }
+ if (tvp != 0 && tvp != i) {
+ if (BATdescriptor(tvp) == NULL) {
+ if (tp != i)
+ BBPunfix(tp);
+ return NULL;
+ }
+ }
}
- if (incref(i, false, false) <= 0)
+ if (lock) {
+ for (;;) {
+ MT_lock_set(&GDKswapLock(i));
+ if (!(BBP_status(i) & (BBPUNSTABLE|BBPLOADING)))
+ break;
+ /* the BATs is "unstable", try again */
+ MT_lock_unset(&GDKswapLock(i));
+ BBPspin(i, __func__, BBPUNSTABLE|BBPLOADING);
+ }
+ }
+ int refs;
+ if ((refs = incref(i, false, false)) <= 0)
return NULL;
b = BBP_cache(i);
if (b == NULL)
b = getBBPdescriptor(i);
- MT_lock_unset(&GDKswapLock(i));
- if (b != NULL) {
- MT_lock_set(&b->theaplock);
- int tp = b->theap->parentid;
- int tvp = b->tvheap ? b->tvheap->parentid : 0;
- MT_lock_unset(&b->theaplock);
- if (tp != b->batCacheid &&
- BATdescriptor(tp) == NULL) {
- decref(i, false, false, false, false, __func__);
- return NULL;
- }
- if (tvp != 0 &&
- tvp != b->batCacheid &&
- BATdescriptor(tvp) == NULL) {
- if (tp != b->batCacheid)
- decref(tp, false, false, true, true,
__func__);
-
- decref(i, false, false, false, false, __func__);
- return NULL;
- }
+ if (lock)
+ MT_lock_unset(&GDKswapLock(i));
+ if (refs > 1) {
+ if (tp != 0 && tp != i)
+ BBPunfix(tp);
+ if (tvp != 0 && tvp != i)
+ BBPunfix(tvp);
}
}
return b;
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