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Lazyfree: a first implementation of non blocking DEL.

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This commit is contained in:
antirez
2015-07-30 11:46:31 +02:00
parent 712ea7296d
commit 0c05436cef
8 changed files with 341 additions and 53 deletions
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23
src/object.c
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@ -48,6 +48,23 @@ robj *createObject(int type, void *ptr) {
return o;
}
/* Set a special refcount in the object to make it "shared":
* incrRefCount and decrRefCount() will test for this special refcount
* and will not touch the object. This way it is free to access shared
* objects such as small integers from different threads without any
* mutex.
*
* A common patter to create shared objects:
*
* robj *myobject = makeObjectShared(createObject(...));
*
*/
robj *makeObjectShared(robj *o) {
serverAssert(o->refcount == 1);
o->refcount = OBJ_SHARED_REFCOUNT;
return o;
}
/* Create a string object with encoding OBJ_ENCODING_RAW, that is a plain
* string object where o->ptr points to a proper sds string. */
robj *createRawStringObject(const char *ptr, size_t len) {
@ -295,11 +312,10 @@ void freeHashObject(robj *o) {
}
void incrRefCount(robj *o) {
o->refcount++;
if (o->refcount != OBJ_SHARED_REFCOUNT) o->refcount++;
}
void decrRefCount(robj *o) {
if (o->refcount <= 0) serverPanic("decrRefCount against refcount <= 0");
if (o->refcount == 1) {
switch(o->type) {
case OBJ_STRING: freeStringObject(o); break;
@ -311,7 +327,8 @@ void decrRefCount(robj *o) {
}
zfree(o);
} else {
o->refcount--;
if (o->refcount <= 0) serverPanic("decrRefCount against refcount <= 0");
if (o->refcount != OBJ_SHARED_REFCOUNT) o->refcount--;
}
}