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Make push/shift functions for callbacks responsible for malloc/free

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This commit is contained in:
Pieter Noordhuis 2010-11-01 10:10:03 +01:00
parent e25db30f38
commit a66ec18e80
1 changed files with 32 additions and 19 deletions
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51
async.c
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@ -69,22 +69,38 @@ int redisAsyncSetDisconnectCallback(redisAsyncContext *ac, redisDisconnectCallba
}
/* Helper functions to push/shift callbacks */
static void __redisPushCallback(redisCallbackList *list, redisCallback *cb) {
static int __redisPushCallback(redisCallbackList *list, redisCallback *source) {
redisCallback *cb;
/* Copy callback from stack to heap */
cb = calloc(1,sizeof(*cb));
if (!cb) redisOOM();
if (source != NULL)
memcpy(cb,source,sizeof(*cb));
/* Store callback in list */
if (list->head == NULL)
list->head = cb;
if (list->tail != NULL)
list->tail->next = cb;
list->tail = cb;
return REDIS_OK;
}
static redisCallback *__redisShiftCallback(redisCallbackList *list) {
static int __redisShiftCallback(redisCallbackList *list, redisCallback *target) {
redisCallback *cb = list->head;
if (cb != NULL) {
list->head = cb->next;
if (cb == list->tail)
list->tail = NULL;
/* Copy callback from heap to stack */
if (target != NULL)
memcpy(target,cb,sizeof(*cb));
free(cb);
return REDIS_OK;
}
return cb;
return REDIS_ERR;
}
/* Tries to do a clean disconnect from Redis, meaning it stops new commands
@ -102,7 +118,7 @@ void redisAsyncDisconnect(redisAsyncContext *ac) {
/* Helper function to make the disconnect happen and clean up. */
static void __redisAsyncDisconnect(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
redisCallback *cb;
redisCallback cb;
int status;
/* Make sure error is accessible if there is any */
@ -112,15 +128,15 @@ static void __redisAsyncDisconnect(redisAsyncContext *ac) {
if (status == REDIS_OK) {
/* When the connection is cleanly disconnected, there should not
* be pending callbacks. */
assert((cb = __redisShiftCallback(&ac->replies)) == NULL);
assert(__redisShiftCallback(&ac->replies,NULL) == REDIS_ERR);
} else {
/* Callbacks should not be able to issue new commands. */
c->flags |= REDIS_DISCONNECTING;
/* Execute pending callbacks with NULL reply. */
while ((cb = __redisShiftCallback(&ac->replies)) != NULL) {
if (cb->fn != NULL)
cb->fn(ac,NULL,cb->privdata);
while (__redisShiftCallback(&ac->replies,&cb) == REDIS_OK) {
if (cb.fn != NULL)
cb.fn(ac,NULL,cb.privdata);
}
}
@ -136,7 +152,7 @@ static void __redisAsyncDisconnect(redisAsyncContext *ac) {
void redisProcessCallbacks(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
redisCallback *cb;
redisCallback cb;
void *reply = NULL;
int status;
@ -155,10 +171,9 @@ void redisProcessCallbacks(redisAsyncContext *ac) {
}
/* Shift callback and execute it */
cb = __redisShiftCallback(&ac->replies);
assert(cb != NULL);
if (cb->fn != NULL) {
cb->fn(ac,reply,cb->privdata);
assert(__redisShiftCallback(&ac->replies,&cb) == REDIS_OK);
if (cb.fn != NULL) {
cb.fn(ac,reply,cb.privdata);
} else {
c->fn->freeObject(reply);
}
@ -210,18 +225,16 @@ void redisAsyncHandleWrite(redisAsyncContext *ac) {
*/
static int __redisAsyncCommand(redisAsyncContext *ac, redisCallbackFn *fn, void *privdata, char *cmd, size_t len) {
redisContext *c = &(ac->c);
redisCallback *cb;
redisCallback cb;
/* Don't accept new commands when the connection is lazily closed. */
if (c->flags & REDIS_DISCONNECTING) return REDIS_ERR;
c->obuf = sdscatlen(c->obuf,cmd,len);
/* Store callback */
cb = calloc(1,sizeof(redisCallback));
if (!cb) redisOOM();
cb->fn = fn;
cb->privdata = privdata;
__redisPushCallback(&(ac->replies),cb);
cb.fn = fn;
cb.privdata = privdata;
__redisPushCallback(&ac->replies,&cb);
/* Always schedule a write when the write buffer is non-empty */
if (ac->evAddWrite) ac->evAddWrite(ac->data);