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transactions now can check with allocation policy before allocating to pages of their own choosing

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This commit is contained in:
Sears Russell 2008-10-27 23:20:31 +00:00
parent fa18df2424
commit 71cc9d6df7
2 changed files with 21 additions and 0 deletions
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17
src/stasis/allocationPolicy.c
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@ -302,6 +302,23 @@ availablePage * allocationPolicyFindPage(allocationPolicy * ap, int xid, int fre
return (availablePage*) ret;
}
int allocationPolicyCanXidAllocFromPage(allocationPolicy *ap, int xid, pageid_t page) {
availablePage * p = getAvailablePage(ap, page);
const availablePage * check1 = RB_ENTRY(find)(p, ap->availablePages);
int * xidp = LH_ENTRY(find)(ap->pageOwners, &(page), sizeof(page));
if(!(xidp || check1)) {
// the page is not available, and not owned.
return 0; // can't safely alloc from page
}
if(check1) {
// the page is available and unlocked
return 1; // can safely alloc from page
} else {
// someone owns the page. Is it this xid?
return (*xidp == xid);
}
}
void allocationPolicyAllocedFromPage(allocationPolicy *ap, int xid, pageid_t page) {
availablePage * p = getAvailablePage(ap, page);
const availablePage * check1 = RB_ENTRY(find)(p, ap->availablePages);

4
src/stasis/operations/alloc.c
View file

@ -365,6 +365,10 @@ compensated_function recordid TallocFromPage(int xid, pageid_t page, unsigned lo
}
pthread_mutex_lock(&talloc_mutex);
if(!allocationPolicyCanXidAllocFromPage(allocPolicy, xid, page)) {
pthread_mutex_unlock(&talloc_mutex);
return NULLRID;
}
Page * p = loadPage(xid, page);
writelock(p->rwlatch,0);
recordid rid = stasis_record_alloc_begin(xid, p, type);