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forgot to commit header for new allocation policy function

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Sears Russell 2008-10-27 23:30:53 +00:00
parent 470c52c9cc
commit c7ba4dfb62
1 changed files with 16 additions and 1 deletions
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17
stasis/allocationPolicy.h
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@ -20,5 +20,20 @@ void allocationPolicyTransactionCompleted(allocationPolicy * ap, int xid);
void allocationPolicyUpdateFreespaceUnlockedPage(allocationPolicy * ap, availablePage * key, int newFree);
void allocationPolicyUpdateFreespaceLockedPage(allocationPolicy * ap, int xid, availablePage * key, int newFree);
void allocationPolicyLockPage(allocationPolicy * ap, int xid, pageid_t page);
void allocationPolicyAllocedFromPage(allocationPolicy * ap, int xid, pageid_t page);
void allocationPolicyAllocedFromPage(allocationPolicy * ap, int xid, pageid_t page);
/**
Check to see if it is safe to allocate from a particular page.
If concurrent transactions have freed up space on a page, but they
eventually abort, then it might not be safe for the current
transaction to reuse the storage those transactions freed. This is
needed for methods such as TallocFromPage(), which do not consult
allocation policy before deciding where to attempt allocation.
@param ap The allocation policy managing the space in question
@param xid The transaction that wants to allocate space from the page
@param page The page that will be allocated from.
@return true if the allocation would be safe. false if not sure.
*/
int allocationPolicyCanXidAllocFromPage(allocationPolicy * ap, int xid, pageid_t page);
#endif // ALLOCATION_POLICY_H