hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Remove unused locks and variables

Browse Source 
Removed unused spinlocks from DCBs, sessions and the MySQL protocol
structs. They were used in a context where only one thread has access to
the structure.

Removed unused member variables from DCBs.
This commit is contained in:
Markus Mäkelä
2017-02-03 17:26:55 +02:00
parent 517ecd9a12
commit ce5cd69eb3
15 changed files with 36 additions and 217 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
server/modules/protocol/MySQL/MySQLBackend/mysql_backend.c
View File

@ -638,9 +638,7 @@ gw_reply_on_error(DCB *dcb, mxs_auth_state_t state)
session->router_session,
errbuf, dcb, ERRACT_REPLY_CLIENT, &succp);
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
ss_dassert(dcb->dcb_errhandle_called);
}
else
@ -737,9 +735,7 @@ gw_read_and_write(DCB *dcb)
if (!succp)
{
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
return 0;
}
@ -1174,22 +1170,7 @@ static int gw_error_backend_event(DCB *dcb)
0,
"Lost connection to backend server.");
spinlock_acquire(&session->ses_lock);
ses_state = session->state;
spinlock_release(&session->ses_lock);
/**
* Session might be initialized when DCB already is in the poll set.
* Thus hangup can occur in the middle of session initialization.
* Only complete and successfully initialized sessions allow for
* calling error handler.
*/
while (ses_state == SESSION_STATE_READY)
{
spinlock_acquire(&session->ses_lock);
ses_state = session->state;
spinlock_release(&session->ses_lock);
}
if (ses_state != SESSION_STATE_ROUTER_READY)
{
@ -1226,9 +1207,7 @@ static int gw_error_backend_event(DCB *dcb)
*/
if (!succp)
{
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
retblock:
@ -1278,22 +1257,7 @@ static int gw_backend_hangup(DCB *dcb)
0,
"Lost connection to backend server.");
spinlock_acquire(&session->ses_lock);
ses_state = session->state;
spinlock_release(&session->ses_lock);
/**
* Session might be initialized when DCB already is in the poll set.
* Thus hangup can occur in the middle of session initialization.
* Only complete and successfully initialized sessions allow for
* calling error handler.
*/
while (ses_state == SESSION_STATE_READY)
{
spinlock_acquire(&session->ses_lock);
ses_state = session->state;
spinlock_release(&session->ses_lock);
}
if (ses_state != SESSION_STATE_ROUTER_READY)
{
@ -1331,9 +1295,7 @@ static int gw_backend_hangup(DCB *dcb)
/** There are no required backends available, close session. */
if (!succp)
{
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
retblock:
@ -1372,7 +1334,7 @@ static int gw_backend_close(DCB *dcb)
* but client's close and adding client's DCB to zombies list is executed
* only if client's DCB's state does _not_ change in parallel.
*/
spinlock_acquire(&session->ses_lock);
/**
* If session->state is STOPPING, start closing client session.
* Otherwise only this backend connection is closed.
@ -1382,19 +1344,9 @@ static int gw_backend_close(DCB *dcb)
{
if (session->client_dcb->state == DCB_STATE_POLLING)
{
spinlock_release(&session->ses_lock);
/** Close client DCB */
dcb_close(session->client_dcb);
}
else
{
spinlock_release(&session->ses_lock);
}
}
else
{
spinlock_release(&session->ses_lock);
}
}
return 1;
@ -1472,9 +1424,7 @@ static int backend_write_delayqueue(DCB *dcb, GWBUF *buffer)
if (!succp)
{
spinlock_acquire(&session->ses_lock);
session->state = SESSION_STATE_STOPPING;
spinlock_release(&session->ses_lock);
}
}
@ -1565,8 +1515,6 @@ static int gw_change_user(DCB *backend,
memcpy(&backend_protocol->charset, client_auth_packet, sizeof(int));
}
spinlock_acquire(&in_session->ses_lock);
/* save current_database name */
strcpy(current_database, current_session->db);
@ -1586,7 +1534,6 @@ static int gw_change_user(DCB *backend,
sizeof(client_protocol->scramble),
username, client_sha1);
strcpy(current_session->db, current_database);
spinlock_release(&in_session->ses_lock);
if (auth_ret != 0)
{
@ -1594,7 +1541,6 @@ static int gw_change_user(DCB *backend,
{
/* Try authentication again with new repository data */
/* Note: if no auth client authentication will fail */
spinlock_acquire(&in_session->ses_lock);
*current_session->db = 0;
auth_ret = gw_check_mysql_scramble_data(
backend->session->client_dcb,
@ -1603,7 +1549,6 @@ static int gw_change_user(DCB *backend,
sizeof(client_protocol->scramble),
username, client_sha1);
strcpy(current_session->db, current_database);
spinlock_release(&in_session->ses_lock);
}
}