pc_hash_t *pc_hash_create_min(pc_pool_t *pool, int min_items)
{
pc_hash_t *result = pc_alloc(pool, sizeof(*result));
result->count = 0;
result->pool = pool;
if (min_items > 1000000000)
result->twins_index = TWINS_COUNT - 1;
else
{
/* Scale up MIN_ITEMS based on our desired initial load factor */
if (min_items > 10000000)
{
min_items = (min_items / INITIAL_LOAD) * 100;
result->twins_index = TWIN_MIN_10MIL;
}
else
{
min_items = (min_items * 100) / INITIAL_LOAD;
result->twins_index = 0;
}
while (twins[result->twins_index] < min_items
&& result->twins_index < TWINS_COUNT - 1)
++result->twins_index;
}
result->alloc = twins[result->twins_index] + 2; /* higher of the pair! */
result->slots = pc_alloc(pool, result->alloc * sizeof(*result->slots));
pc_hash_clear(result);
return result;
}
static void
maybe_grow(pc_hash_t *hash)
{
int threshold;
int alloc;
struct pc_hslot_s *slots;
if (hash->twins_index == TWINS_COUNT - 1)
return;
if (hash->alloc < 10000000)
threshold = (hash->alloc * MAX_LOAD_PERCENT) / 100;
else
threshold = (hash->alloc / 100) * MAX_LOAD_PERCENT;
if (hash->count + 1 < threshold)
return;
alloc = twins[++hash->twins_index] + 2; /* the higher of the pair! */
slots = pc_alloc(hash->pool, alloc * sizeof(*slots));
memset(slots, 0, alloc * sizeof(*slots));
copy_items(hash, slots, alloc);
/* ### free old hash->slots */
hash->alloc = alloc;
hash->slots = slots;
}
pc_hiter_t *pc_hiter_begin(const pc_hash_t *hash, pc_pool_t *pool)
{
pc_hiter_t *result = pc_alloc(pool, sizeof(*result));
result->current = hash->slots;
result->last = &hash->slots[hash->alloc];
if (result->current->key == NULL || result->current->key == SLOT_DELETED)
return pc_hiter_next(result);
return result;
}
pc_error_t *pc_address_lookup(pc_hash_t **addresses,
const char *name,
int port,
int flags,
pc_pool_t *pool)
{
char portbuf[6];
struct addrinfo hints = { 0 };
struct addrinfo *results;
struct addrinfo *scan;
int rv;
if (port <= 0 || port > 65535)
return pc_error_create_pm(pool, PC_ERR_BAD_PARAM,
"port number out of range");
snprintf(portbuf, sizeof(portbuf), "%d", port);
/* ### these are the wrong hints for now, but let's just get started */
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
rv = getaddrinfo(name, portbuf, &hints, &results);
if (rv != 0)
{
const char *msg = gai_strerror(rv);
return pc_error_create_pm(pool, PC_ERR_ADDRESS_LOOKUP, msg);
}
*addresses = pc_hash_create(pool);
for (scan = results; scan != NULL; scan = scan->ai_next)
{
/* Can the returned address fit into our structure?
### this is probably bogus and needs some research. */
if (scan->ai_addrlen <= sizeof(((pc_address_t *)0)->a.inet))
{
pc_address_t *addr = pc_alloc(pool, sizeof(*addr));
const char *readable;
memcpy(&addr->a.inet, scan->ai_addr, scan->ai_addrlen);
readable = pc_address_readable(addr, pool);
pc_hash_sets(*addresses, readable, addr);
}
}
freeaddrinfo(results);
return PC_NO_ERROR;
}
static read_buffer_t *
get_read_buffer(struct pc__channel_ctx_s *cctx)
{
read_buffer_t *rb = cctx->avail;
if (rb == NULL)
{
rb = pc_alloc(cctx->pool, sizeof(*rb) + READ_BUFFER_SIZE);
rb->buf = (char *)rb + sizeof(*rb);
rb->len = READ_BUFFER_SIZE;
return rb;
}
cctx->avail = rb->next;
return rb;
}
static void
get_iovec(struct iovec **result_iov,
int *result_iovcnt,
pc_channel_t *channel)
{
int iovcnt = channel->pending_iovcnt;
char *buf = channel->pending_buf;
assert(channel->pending_iov != NULL && iovcnt > 0);
/* The simplest case: we can directly use PENDING_IOV because we don't
need to adjust the first iovec for PENDING_BUF. */
if (buf == NULL || buf == channel->pending_iov[0].iov_base)
{
*result_iov = channel->pending_iov;
*result_iovcnt = iovcnt;
return;
}
/* The first iovec must be adjusted, so we need to copy it into our
pre-allocated scratch area, or onto the heap. */
if (iovcnt <= INTERNAL_IOVEC_COUNT)
{
*result_iov = &channel->ctx->cctx->scratch_iov[0];
*result_iovcnt = iovcnt;
}
else
{
*result_iov = pc_alloc(channel->ctx->cctx->callback_scratch,
iovcnt * sizeof(**result_iov));
*result_iovcnt = iovcnt;
}
memcpy(*result_iov, channel->pending_iov, iovcnt * sizeof(**result_iov));
(*result_iov)[0].iov_base = buf;
(*result_iov)[0].iov_len =
(channel->pending_iov[0].iov_len
- (buf - (char *)channel->pending_iov[0].iov_base));
}
