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Use SYS_LIGHTWEIGHT_PROT instead of a semaphore to protect the sockets array since the protection time is short

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This commit is contained in:
goldsimon 2010-01-30 15:01:29 +00:00
parent f8c22c7428
commit c22d3b4c98
2 changed files with 23 additions and 17 deletions
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4
CHANGELOG
View File

@ -19,6 +19,10 @@ HISTORY
++ New features:
2010-01-30. simon Goldschmidt
* sockets.c: Use SYS_LIGHTWEIGHT_PROT instead of a semaphore to protect
the sockets array.
2010-01-29: Simon Goldschmidt (patch by Laura Garrett)
* api.h, api_msg.c, sockets.c: Added except set support in select
(patch #6860)

36
src/api/sockets.c
View File

@ -117,8 +117,6 @@ static struct lwip_socket sockets[NUM_SOCKETS];
/** The global list of tasks waiting for select */
static struct lwip_select_cb *select_cb_list;
/** Semaphore protecting the sockets array */
static sys_sem_t socksem;
/** Semaphore protecting select_cb_list */
static sys_sem_t selectsem;
@ -174,7 +172,6 @@ static void lwip_setsockopt_internal(void *arg);
void
lwip_socket_init(void)
{
socksem = sys_sem_new(1);
selectsem = sys_sem_new(1);
}
@ -216,12 +213,12 @@ static int
alloc_socket(struct netconn *newconn)
{
int i;
/* Protect socket array */
sys_sem_wait(socksem);
SYS_ARCH_DECL_PROTECT(lev);
/* allocate a new socket identifier */
for (i = 0; i < NUM_SOCKETS; ++i) {
/* Protect socket array */
SYS_ARCH_PROTECT(lev);
if (!sockets[i].conn) {
sockets[i].conn = newconn;
sockets[i].lastdata = NULL;
@ -231,11 +228,11 @@ alloc_socket(struct netconn *newconn)
sockets[i].sendevent = (newconn->type == NETCONN_TCP ? 0 : 1);
sockets[i].errevent = 0;
sockets[i].err = 0;
sys_sem_signal(socksem);
SYS_ARCH_UNPROTECT(lev);
return i;
}
SYS_ARCH_UNPROTECT(lev);
}
sys_sem_signal(socksem);
return -1;
}
@ -248,14 +245,16 @@ static void
free_socket(struct lwip_socket *sock)
{
struct netbuf *lastdata;
SYS_ARCH_DECL_PROTECT(lev);
sys_sem_wait(socksem);
lastdata = sock->lastdata;
/* Protect socket array */
SYS_ARCH_PROTECT(lev);
lastdata = sock->lastdata;
sock->lastdata = NULL;
sock->lastoffset = 0;
sock->conn = NULL;
sock_set_errno(sock, 0);
sys_sem_signal(socksem);
sock->err = 0;
SYS_ARCH_UNPROTECT(lev);
if (lastdata != NULL) {
netbuf_delete(lastdata);
@ -278,6 +277,7 @@ lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
int newsock;
struct sockaddr_in sin;
err_t err;
SYS_ARCH_DECL_PROTECT(lev);
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d)...\n", s));
sock = get_socket(s);
@ -336,15 +336,15 @@ lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
nsock = &sockets[newsock];
LWIP_ASSERT("invalid socket pointer", nsock != NULL);
sys_sem_wait(socksem);
/* See event_callback: If data comes in right away after an accept, even
* though the server task might not have created a new socket yet.
* In that case, newconn->socket is counted down (newconn->socket--),
* so nsock->rcvevent is >= 1 here!
*/
SYS_ARCH_PROTECT(lev);
nsock->rcvevent += (s16_t)(-1 - newconn->socket);
newconn->socket = newsock;
sys_sem_signal(socksem);
SYS_ARCH_UNPROTECT(lev);
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) returning new sock=%d addr=", s, newsock));
ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
@ -405,6 +405,7 @@ lwip_close(int s)
netconn_delete(sock->conn);
free_socket(sock);
set_errno(0);
return 0;
}
@ -1079,16 +1080,17 @@ event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
* Just count down (or up) if that's the case and we
* will use the data later. Note that only receive events
* can happen before the new socket is set up. */
sys_sem_wait(socksem);
SYS_ARCH_DECL_PROTECT(lev);
SYS_ARCH_PROTECT(lev);
if (conn->socket < 0) {
if (evt == NETCONN_EVT_RCVPLUS) {
conn->socket--;
}
sys_sem_signal(socksem);
SYS_ARCH_UNPROTECT(lev);
return;
}
s = conn->socket;
sys_sem_signal(socksem);
SYS_ARCH_UNPROTECT(lev);
}
sock = get_socket(s);