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netconn: switch gethostbyname to use tcpip_send_msg_wait_sem (task #14523)

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This switches netconn_gethostbyname to use tcpip_send_msg_wait_sem to
take advantage of core locking support when enabled.

tcpip_send_msg_wait_sem handles blocking for the non-core locking case,
so we can remove the manual blocking in netconn_gethostbyname. For the
core locking case, we need to block if waiting on DNS callback. To
achieve this, we unlock the core and wait in lwip_netconn_do_gethostbyname.
This is the similar approach that netconn_write takes when it needs to
block to continue the write (see lwip_netconn_do_write)

This improves performance in the core locking case and is no change
for the non-core locking case
This commit is contained in:
Joel Cunningham
2017-05-31 19:36:39 -05:00
parent f13b1340f2
commit d4c8a1ac78
3 changed files with 18 additions and 9 deletions
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10
src/api/api_msg.c
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@@ -2042,11 +2042,21 @@ lwip_netconn_do_gethostbyname(void *arg)
API_EXPR_DEREF(msg->err) = dns_gethostbyname_addrtype(msg->name,
API_EXPR_REF(msg->addr), lwip_netconn_do_dns_found, msg, addrtype);
#if LWIP_TCPIP_CORE_LOCKING
/* For core locking, only block if we need to wait for answer/timeout */
if (API_EXPR_DEREF(msg->err) == ERR_INPROGRESS) {
UNLOCK_TCPIP_CORE();
sys_sem_wait(API_EXPR_REF_SEM(msg->sem));
LOCK_TCPIP_CORE();
LWIP_ASSERT("do_gethostbyname still in progress!!", API_EXPR_DEREF(msg->err) != ERR_INPROGRESS);
}
#else /* LWIP_TCPIP_CORE_LOCKING */
if (API_EXPR_DEREF(msg->err) != ERR_INPROGRESS) {
/* on error or immediate success, wake up the application
* task waiting in netconn_gethostbyname */
sys_sem_signal(API_EXPR_REF_SEM(msg->sem));
}
#endif /* LWIP_TCPIP_CORE_LOCKING */
}
#endif /* LWIP_DNS */