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obtain readlocks on lsm tree pages while iterating over them

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This commit is contained in:
Sears Russell 2008-11-26 07:05:22 +00:00
parent 6a5e7f5589
commit b8624d09b1
1 changed files with 8 additions and 1 deletions
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9
stasis/operations/lsmIterators.h
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@ -239,6 +239,7 @@ class treeIterator {
lsmTreeIterator_value(-1,lsmIterator_,(byte**)hack);
pageid_ = *pid_tmp;
p_ = loadPage(-1,pageid_);
readlock(p_->rwlatch,0);
currentPage_ = (PAGELAYOUT*)p_->impl;
assert(currentPage_);
}
@ -314,12 +315,14 @@ class treeIterator {
pageid_(t.pageid_),
p_((Page*)((t.p_)?loadPage(-1,t.p_->id):0)),
currentPage_((PAGELAYOUT*)((p_)?p_->impl:0)) {
if(p_) { readlock(p_->rwlatch,0); }
}
~treeIterator() {
if(lsmIterator_) {
lsmTreeIterator_close(-1, lsmIterator_);
}
if(p_) {
unlock(p_->rwlatch);
releasePage(p_);
p_ = 0;
}
@ -329,6 +332,7 @@ class treeIterator {
ROW* readTuple = currentPage_->recordRead(-1,slot_, &scratch_);
if(!readTuple) {
unlock(p_->rwlatch);
releasePage(p_);
p_=0;
if(lsmTreeIterator_next(-1,lsmIterator_)) {
@ -339,7 +343,7 @@ class treeIterator {
lsmTreeIterator_value(-1,lsmIterator_,(byte**)hack);
pageid_ = *pid_tmp;
p_ = loadPage(-1,pageid_);
readlock(p_->rwlatch,0);
currentPage_ = (PAGELAYOUT*)p_->impl;
readTuple = currentPage_->recordRead(-1,slot_, &scratch_);
@ -378,6 +382,7 @@ class treeIterator {
return t;
}
if(t->p_) {
unlock(t->p_->rwlatch);
releasePage(t->p_);
t->p_=0;
}
@ -387,9 +392,11 @@ class treeIterator {
if(pid != -1) {
t->pageid_= pid;
Page * p = loadPage(-1, t->pageid_);
readlock(p->rwlatch,0);
PAGELAYOUT * lastPage = (PAGELAYOUT*)p->impl;
t->slot_ = 0;
while(lastPage->recordRead(-1,t->slot_,&scratch_)) { t->slot_++; }
unlock(p->rwlatch);
releasePage(p);
} else {
// begin == end already; we're done.