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Fix ziplist regression and update stresser

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1 parent 9d66582 commit 50e50d6a254e693f10e37a37a9cfab4d40e7332b @pietern pietern committed with May 5, 2011
Showing with 34 additions and 31 deletions.
  1. +34 −31 src/ziplist.c
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@@ -398,12 +398,17 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p
offset = p-zl;
extra = rawlensize-next.prevrawlensize;
zl = ziplistResize(zl,curlen+extra);
- ZIPLIST_TAIL_OFFSET(zl) += extra;
p = zl+offset;
- /* Move the tail to the back. */
+ /* Current pointer and offset for next element. */
np = p+rawlen;
noffset = np-zl;
+
+ /* Update tail offset when next element is not the tail element. */
+ if ((zl+ZIPLIST_TAIL_OFFSET(zl)) != np)
+ ZIPLIST_TAIL_OFFSET(zl) += extra;
+
+ /* Move the tail to the back. */
memmove(np+rawlensize,
np+next.prevrawlensize,
curlen-noffset-next.prevrawlensize-1);
@@ -877,7 +882,7 @@ void pop(unsigned char *zl, int where) {
}
}
-void randstring(char *target, unsigned int min, unsigned int max) {
+int randstring(char *target, unsigned int min, unsigned int max) {
int p, len = min+rand()%(max-min+1);
int minval, maxval;
switch(rand() % 3) {
@@ -899,10 +904,9 @@ void randstring(char *target, unsigned int min, unsigned int max) {
while(p < len)
target[p++] = minval+rand()%(maxval-minval+1);
- return;
+ return len;
}
-
int main(int argc, char **argv) {
unsigned char *zl, *p;
unsigned char *entry;
@@ -1235,6 +1239,7 @@ int main(int argc, char **argv) {
int i,j,len,where;
unsigned char *p;
char buf[1024];
+ int buflen;
list *ref;
listNode *refnode;
@@ -1243,10 +1248,6 @@ int main(int argc, char **argv) {
unsigned int slen;
long long sval;
- /* In the regression for the cascade bug, it was triggered
- * with a random seed of 2. */
- srand(2);
-
for (i = 0; i < 20000; i++) {
zl = ziplistNew();
ref = listCreate();
@@ -1256,31 +1257,32 @@ int main(int argc, char **argv) {
/* Create lists */
for (j = 0; j < len; j++) {
where = (rand() & 1) ? ZIPLIST_HEAD : ZIPLIST_TAIL;
- switch(rand() % 4) {
- case 0:
- sprintf(buf,"%lld",(0LL + rand()) >> 20);
- break;
- case 1:
- sprintf(buf,"%lld",(0LL + rand()));
- break;
- case 2:
- sprintf(buf,"%lld",(0LL + rand()) << 20);
- break;
- case 3:
- randstring(buf,0,256);
- break;
- default:
- assert(NULL);
+ if (rand() % 2) {
+ buflen = randstring(buf,1,sizeof(buf)-1);
+ } else {
+ switch(rand() % 3) {
+ case 0:
+ buflen = sprintf(buf,"%lld",(0LL + rand()) >> 20);
+ break;
+ case 1:
+ buflen = sprintf(buf,"%lld",(0LL + rand()));
+ break;
+ case 2:
+ buflen = sprintf(buf,"%lld",(0LL + rand()) << 20);
+ break;
+ default:
+ assert(NULL);
+ }
}
/* Add to ziplist */
- zl = ziplistPush(zl, (unsigned char*)buf, strlen(buf), where);
+ zl = ziplistPush(zl, (unsigned char*)buf, buflen, where);
/* Add to reference list */
if (where == ZIPLIST_HEAD) {
- listAddNodeHead(ref,sdsnew(buf));
+ listAddNodeHead(ref,sdsnewlen(buf, buflen));
} else if (where == ZIPLIST_TAIL) {
- listAddNodeTail(ref,sdsnew(buf));
+ listAddNodeTail(ref,sdsnewlen(buf, buflen));
} else {
assert(NULL);
}
@@ -1295,12 +1297,13 @@ int main(int argc, char **argv) {
assert(ziplistGet(p,&sstr,&slen,&sval));
if (sstr == NULL) {
- sprintf(buf,"%lld",sval);
+ buflen = sprintf(buf,"%lld",sval);
} else {
- memcpy(buf,sstr,slen);
- buf[slen] = '\0';
+ buflen = slen;
+ memcpy(buf,sstr,buflen);
+ buf[buflen] = '\0';
}
- assert(strcmp(buf,listNodeValue(refnode)) == 0);
+ assert(memcmp(buf,listNodeValue(refnode),buflen) == 0);
}
zfree(zl);
listRelease(ref);

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