70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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#include <lladd/operations/alloc.h>
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#include <lladd/page.h>
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#include <lladd/bufferManager.h>
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/**
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Implementation of Talloc() as an operation
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This is a bit strange compared to other operations, as it happens
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in two phases. The buffer manager reserves space for a record
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before the log entry is allocated. Then, the recordid of this
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space is written to the log. Finally, alloc tells bufferManager
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that it will use the space.
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@todo Currently, if the system crashes during an alloc, (before the
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log is flushed, but after bufferManager returns a rid), then the
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space alloced during the crash is leaked. This doesn't seem to be
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too big of a deal, but it should be fixed someday.
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*/
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static int operate(int xid, recordid rid, const void * dat) {
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Page loadedPage = loadPage(rid.page);
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/** Has no effect during normal operation. */
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pageSlotRalloc(loadedPage, rid);
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return 0;
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}
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/** @todo Currently, we just lead store space on dealloc. */
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static int deoperate(int xid, recordid rid, const void * dat) {
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Page loadedPage = loadPage(rid.page);
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/** Has no effect during normal operation. */
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pageSlotRalloc(loadedPage, rid);
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return 0;
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}
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Operation getAlloc() {
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Operation o = {
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OPERATION_ALLOC, /* ID */
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0,
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OPERATION_DEALLOC,
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&operate
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};
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return o;
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}
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recordid Talloc(int xid, size_t size) {
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recordid rid;
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rid = ralloc(xid, size);
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Tupdate(xid,rid, NULL, OPERATION_ALLOC);
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return rid;
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}
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Operation getDealloc() {
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Operation o = {
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OPERATION_DEALLOC,
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0,
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OPERATION_ALLOC,
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&deoperate
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};
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return o;
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}
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void Tdealloc(int xid, recordid rid) {
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Tupdate(xid, rid, NULL, OPERATION_DEALLOC);
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}
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