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ruanhaishen
redis
Commits
5f8fd27a
Commit
5f8fd27a
authored
Feb 28, 2013
by
antirez
Browse files
Cluster: refactoring of clusterNode*Bit to use helper bitmap functions.
parent
d21d6b66
Changes
1
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src/cluster.c
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5f8fd27a
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@@ -1328,31 +1328,47 @@ void clusterCron(void) {
* Slots management
* -------------------------------------------------------------------------- */
/* Test bit 'pos' in a generic bitmap. Return 1 if the bit is zet,
* otherwise 0. */
int bitmapTestBit(unsigned char *bitmap, int pos) {
off_t byte = pos/8;
int bit = pos&7;
return (bitmap[byte] & (1<<bit)) != 0;
}
/* Set the bit at position 'pos' in a bitmap. */
void bitmapSetBit(unsigned char *bitmap, int pos) {
off_t byte = pos/8;
int bit = pos&7;
bitmap[byte] |= 1<<bit;
}
/* Clear the bit at position 'pos' in a bitmap. */
void bitmapClearBit(unsigned char *bitmap, int pos) {
off_t byte = pos/8;
int bit = pos&7;
bitmap[byte] &= ~(1<<bit);
}
/* Set the slot bit and return the old value. */
int clusterNodeSetSlotBit(clusterNode *n, int slot) {
off_t byte = slot/8;
int bit = slot&7;
int old = (n->slots[byte] & (1<<bit)) != 0;
n->slots[byte] |= 1<<bit;
int old = bitmapTestBit(n->slots,slot);
bitmapSetBit(n->slots,slot);
if (!old) n->numslots++;
return old;
}
/* Clear the slot bit and return the old value. */
int clusterNodeClearSlotBit(clusterNode *n, int slot) {
off_t byte = slot/8;
int bit = slot&7;
int old = (n->slots[byte] & (1<<bit)) != 0;
n->slots[byte] &= ~(1<<bit);
int old = bitmapTestBit(n->slots,slot);
bitmapClearBit(n->slots,slot);
if (old) n->numslots--;
return old;
}
/* Return the slot bit from the cluster node structure. */
int clusterNodeGetSlotBit(clusterNode *n, int slot) {
off_t byte = slot/8;
int bit = slot&7;
return (n->slots[byte] & (1<<bit)) != 0;
return bitmapTestBit(n->slots,slot);
}
/* Add the specified slot to the list of slots that node 'n' will
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