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An optimized, but still slow implementation of pageOrientedList.

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This commit is contained in:
Sears Russell 2005-01-29 01:09:29 +00:00
parent 56d98adcbf
commit 4d04155b0e
1 changed files with 37 additions and 11 deletions
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48
src/lladd/operations/pageOrientedListNTA.c
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@ -43,6 +43,7 @@ int TpagedListSpansPages(int xid, recordid list) {
return nextPage != 0;
}
/** Should have write lock on page for this whole function. */
int TpagedListInsert(int xid, recordid list, const byte * key, int keySize, const byte * value, int valueSize) {
int ret = 0;
// if find in list, return 1
@ -60,6 +61,7 @@ int TpagedListInsert(int xid, recordid list, const byte * key, int keySize, cons
if(isBlob) {
recordSize = sizeof(blob_record_t);
}
while(slottedFreespace(p) < recordSize) {
// load next page, update some rid somewhere
list.slot = 0;
@ -83,6 +85,7 @@ int TpagedListInsert(int xid, recordid list, const byte * key, int keySize, cons
releasePage(p);
list.page = nextPage;
p = loadPage(nextPage);
}
}
@ -107,20 +110,25 @@ int TpagedListFind(int xid, recordid list, const byte * key, int keySize, byte *
while (nextPage) {
int i;
int pageCount = TrecordsInPage(xid, list.page);
Page * p = loadPage(list.page);
// int pageCount = TrecordsInPage(xid, list.page);
int pageCount = *numslots_ptr(p);
// printf("%ld\n", nextPage);
fflush(stdout);
//fflush(stdout);
for(i = 1; i < pageCount; i++) {
recordid entry = list;
entry.slot = i;
int length = TrecordSize(xid, entry);
// int length = TrecordSize(xid, entry);
int length = getRecordSize(xid,p,entry);
if(length != -1) { // then entry is defined.
short * dat = malloc(length);
entry.size = length;
Tread(xid, entry, dat);
// Tread(xid, entry, dat);
slottedRead(xid, p, entry, (byte*)dat);
if(*dat == keySize && !memcmp(dat+1, key, keySize)) {
int valueSize = length-keySize-sizeof(short);
*value = malloc(valueSize);
@ -128,20 +136,27 @@ int TpagedListFind(int xid, recordid list, const byte * key, int keySize, byte *
memcpy(*value, ((byte*)(dat+1))+keySize, valueSize);
free(dat);
releasePage(p);
return valueSize;
}
free(dat);
}
}
// recordid rid = list;
list.slot = 0;
list.size = sizeof(long);
Tread(xid, list, &nextPage);
// Tread(xid, list, &nextPage);
slottedRead(xid, p, list, (byte*)&nextPage);
list.page = nextPage;
releasePage(p);
}
return -1;
}
@ -150,7 +165,11 @@ int TpagedListRemove(int xid, recordid list, const byte * key, int keySize) {
while (nextPage) {
int i;
int pageCount = TrecordsInPage(xid, list.page);
Page * p = loadPage(list.page);
// int pageCount = TrecordsInPage(xid, list.page);
int pageCount = *numslots_ptr(p);
// printf("%ld\n", nextPage);
fflush(stdout);
@ -158,15 +177,20 @@ int TpagedListRemove(int xid, recordid list, const byte * key, int keySize) {
for(i = 1; i < pageCount; i++) {
recordid entry = list;
entry.slot = i;
int length = TrecordSize(xid, entry);
// int length = TrecordSize(xid, entry);
int length = getRecordSize(xid, p, entry);
if(length != -1) { // then entry is defined.
short * dat = malloc(length);
entry.size = length;
Tread(xid, entry, dat);
slottedRead(xid,p,entry,(byte*)dat);
// Tread(xid, entry, dat);
if(*dat == keySize && !memcmp(dat+1, key, keySize)) {
releasePage(p);
Tdealloc(xid, entry);
assert(-1 == TrecordSize(xid, entry));
// assert(-1 == TrecordSize(xid, entry));
free(dat);
return 1;
}
@ -177,9 +201,11 @@ int TpagedListRemove(int xid, recordid list, const byte * key, int keySize) {
list.slot = 0;
list.size = sizeof(long);
Tread(xid, list, &nextPage);
// Tread(xid, list, &nextPage);
slottedRead(xid,p,list, (byte*)&nextPage);
list.page = nextPage;
releasePage(p);
}
return 0;