Npreq *np_req_alloc(Npconn *conn, Npfcall *tc) {
Npreq *req;
req = NULL;
xpthread_mutex_lock(&reqpool.lock);
if (reqpool.reqlist) {
req = reqpool.reqlist;
reqpool.reqlist = req->next;
reqpool.reqnum--;
}
xpthread_mutex_unlock(&reqpool.lock);
if (!req) {
req = malloc(sizeof(*req));
if (!req)
return NULL;
}
np_conn_incref(conn);
pthread_mutex_init(&req->lock, NULL);
req->refcount = 1;
req->conn = conn;
req->tag = tc->tag;
req->tcall = tc;
req->rcall = NULL;
req->next = NULL;
req->prev = NULL;
req->wthread = NULL;
req->fid = NULL;
np_preprocess_request (req); /* assigns req->fid */
return req;
}
int
np_srv_add_conn(Npsrv *srv, Npconn *conn)
{
xpthread_mutex_lock(&srv->lock);
np_conn_incref(conn);
conn->srv = srv;
conn->next = srv->conns;
srv->conns = conn;
srv->conncount++;
srv->connhistory++;
xpthread_cond_signal(&srv->conncountcond);
xpthread_mutex_unlock(&srv->lock);
return 1;
}
/* Per-connection read thread.
*/
static void *
np_conn_read_proc(void *a)
{
int i, n, size;
Npsrv *srv;
Npconn *conn = (Npconn *)a;
Nptrans *trans;
Npreq *req;
Npfcall *fc, *fc1;
pthread_detach(pthread_self());
np_conn_incref(conn);
srv = conn->srv;
fc = _alloc_npfcall(conn->msize);
n = 0;
while (fc && conn->trans && (i = np_trans_read(conn->trans, fc->pkt + n, conn->msize - n)) > 0) {
n += i;
again:
size = np_peek_size (fc->pkt, n);
if (size == 0 || n < size)
continue;
/* Corruption on the transport, unhandled op, etc.
* is fatal to the connection. We could consider returning
* an error to the client here. However, various kernels
* may not handle that well, depending on where it happens.
*/
if (!np_deserialize(fc, fc->pkt)) {
_debug_trace (srv, fc);
np_logerr (srv, "protocol error - "
"dropping connection to '%s'",
conn->client_id);
break;
}
if ((srv->flags & SRV_FLAGS_DEBUG_9PTRACE))
_debug_trace (srv, fc);
/* Replace fc, and copy any data past the current packet
* to the replacement.
*/
fc1 = _alloc_npfcall(conn->msize);
if (!fc1) {
np_logerr (srv, "out of memory in receive path - "
"dropping connection to '%s'",
conn->client_id);
break;
}
if (n > size)
memmove(fc1->pkt, fc->pkt + size, n - size);
n -= size;
/* Encapsulate fc in a request and hand to srv worker threads.
* In np_req_alloc, req->fid is looked up/initialized.
*/
req = np_req_alloc(conn, fc);
if (!req) {
np_logerr (srv, "out of memory in receive path - "
"dropping connection to '%s'",
conn->client_id);
break;
}
np_srv_add_req(srv, req);
xpthread_mutex_lock(&conn->lock);
conn->reqs_in++;
xpthread_mutex_unlock(&conn->lock);
fc = fc1;
if (n > 0)
goto again;
}
/* Just got EOF on read, or some other fatal error for the
* connection like out of memory.
*/
xpthread_mutex_lock(&conn->lock);
trans = conn->trans;
conn->trans = NULL;
if (fc)
_free_npfcall(fc);
xpthread_mutex_unlock(&conn->lock);
np_srv_remove_conn(conn->srv, conn);
np_conn_reset(conn);
if (trans)
np_trans_destroy(trans);
np_conn_decref(conn);
return NULL;
}
static void *
np_conn_read_proc(void *a)
{
int i, n, size, msize;
Npsrv *srv;
Npconn *conn;
Nptrans *trans;
Npreq *req;
Npfcall *fc, *fc1;
pthread_detach(pthread_self());
conn = a;
np_conn_incref(conn);
srv = conn->srv;
msize = conn->msize;
fc = np_conn_new_incall(conn);
n = 0;
while (conn->trans && (i = np_trans_read(conn->trans, fc->pkt + n, msize - n)) > 0) {
pthread_mutex_lock(&conn->lock);
if (conn->resetting) {
while(conn->resetting)
pthread_cond_wait(&conn->resetdonecond, &conn->lock);
n = 0; /* discard all input */
i = 0;
}
pthread_mutex_unlock(&conn->lock);
n += i;
again:
if (n < 4)
continue;
size = fc->pkt[0] | (fc->pkt[1]<<8) | (fc->pkt[2]<<16) | (fc->pkt[3]<<24);
if (n < size)
continue;
if (!np_deserialize(fc, fc->pkt, conn->dotu))
break;
if (conn->srv->debuglevel) {
fprintf(stderr, "<<< (%p) ", conn);
np_printfcall(stderr, fc, conn->dotu);
fprintf(stderr, "\n");
}
fc1 = np_conn_new_incall(conn);
if (n > size)
memmove(fc1->pkt, fc->pkt + size, n - size);
n -= size;
req = np_req_alloc(conn, fc);
pthread_mutex_lock(&srv->lock);
if (!conn->resetting)
np_srv_add_req(srv, req);
else
np_req_unref(req);
pthread_mutex_unlock(&srv->lock);
fc = fc1;
if (n > 0)
goto again;
}
pthread_mutex_lock(&conn->lock);
trans = conn->trans;
conn->trans = NULL;
np_conn_free_incall(conn, fc);
pthread_mutex_unlock(&conn->lock);
np_srv_remove_conn(conn->srv, conn);
np_conn_reset(conn, 0, 0);
if (trans)
np_trans_destroy(trans);
np_conn_decref(conn);
return NULL;
}