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api_lib.c (from Dmitry Potapov) : patch for netconn_write(), fixes a possible race condition which cause to send some garbage. It is not a definitive solution, but the patch does solve the problem for most cases.

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This commit is contained in:
fbernon 2007-03-26 15:37:48 +00:00
parent e54cd23ecb
commit 005e5f2f72
2 changed files with 10 additions and 6 deletions
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5
CHANGELOG
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@ -78,6 +78,11 @@ HISTORY
++ Bug fixes: ++ Bug fixes:
2007-03-26 Frédéric Bernon (based on patch from Dmitry Potapov)
* api_lib.c: patch for netconn_write(), fixes a possible race condition which cause
to send some garbage. It is not a definitive solution, but the patch does solve
the problem for most cases.
2007-03-22 Frédéric Bernon 2007-03-22 Frédéric Bernon
* api_msg.h, api_msg.c: Remove obsolete API_MSG_ACCEPT and do_accept (never used). * api_msg.h, api_msg.c: Remove obsolete API_MSG_ACCEPT and do_accept (never used).

11
src/api/api_lib.c
View File

@ -589,7 +589,7 @@ err_t
netconn_write(struct netconn *conn, const void *dataptr, u16_t size, u8_t copy) netconn_write(struct netconn *conn, const void *dataptr, u16_t size, u8_t copy)
{ {
struct api_msg msg; struct api_msg msg;
u16_t len; u16_t len, sndbuf;
if (conn == NULL) { if (conn == NULL) {
return ERR_VAL; return ERR_VAL;
@ -608,16 +608,15 @@ netconn_write(struct netconn *conn, const void *dataptr, u16_t size, u8_t copy)
msg.msg.msg.w.copy = copy; msg.msg.msg.w.copy = copy;
if (conn->type == NETCONN_TCP) { if (conn->type == NETCONN_TCP) {
if (tcp_sndbuf(conn->pcb.tcp) == 0) { while ((sndbuf = tcp_sndbuf(conn->pcb.tcp)) == 0) {
sys_sem_wait(conn->sem); sys_sem_wait(conn->sem);
if (conn->err != ERR_OK) { if (conn->err != ERR_OK) {
goto ret; goto ret;
} }
} }
if (size > tcp_sndbuf(conn->pcb.tcp)) { if (size > sndbuf) {
/* We cannot send more than one send buffer's worth of data at a /* We cannot send more than one send buffer's worth of data at a time. */
time. */ len = sndbuf;
len = tcp_sndbuf(conn->pcb.tcp);
} else { } else {
len = size; len = size;
} }