patchlwIP - A Lightweight TCP/IP stack - Patches: patch #5959, Implement SO_RCVTIMEO for accept...


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patch #5959: Implement SO_RCVTIMEO for accept and recv (on TCP netconn)

Submitted by:  Frédéric Bernon <fbernon>
Submitted on:  Wed 23 May 2007 10:32:20 AM UTC  
Category:  None Priority:  3 - Low
Status:  Done Privacy:  Public
Assigned to:  Frédéric Bernon <fbernon> Open/Closed:  Closed
Planned Release:  None

Thu 24 May 2007 03:20:44 PM UTC, comment #4: 

So, if I understand, like it's check in, it's good for you?

Ok, so, I close that... (reopen if I'm wrong...)

Frédéric Bernon <fbernon>
Project MemberIn charge of this item.
Thu 24 May 2007 03:15:44 PM UTC, comment #3: 

Since you asked for a comment.... I don't think the code is made sufficiently more complex that this "simpler" is worth the test and set. It looks neater, but the version without the macro is still easy to understand and maintain. In fact, since someone would have to look up what macro does, I'm not sure it would save the complexity anyway.

Jonathan Larmour <jifl>
Project Member
Wed 23 May 2007 07:24:56 PM UTC, comment #2: 

Ok, I check in. Just a tips about the fact to call or not the conn->callback with NETCONN_EVT_RCVMINUS, I'm not 100% sure of the thing to do, but I have try to respect the current instruction flow, but tell me.

It is also possible to get a "simpler" code with #if/#else/#endif in the code, with a macro like this at the beginning of api_lib.c:

#define CONN_RCVTIMEO(conn) (conn->recv_timeout)
#define CONN_RCVTIMEO(conn) (0)
#endif /* LWIP_SO_RCVTIMEO*/

And further in the code always let the test like this:

if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, CONN_RCVTIMEO(conn))==SYS_ARCH_TIMEOUT) {
  p = NULL;

It better to get a code more lisible, but add a test and a set.

Tell me if you prefer...

Frédéric Bernon <fbernon>
Project MemberIn charge of this item.
Wed 23 May 2007 01:40:19 PM UTC, comment #1: 

Looks fine to me.

Jonathan Larmour <jifl>
Project Member
Wed 23 May 2007 10:32:20 AM UTC, original submission:  

It's a very simple patch I propose :

for netconn_accept, in api_lib.c :

    if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
      newconn = NULL;
    sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, 0);
#endif /* LWIP_SO_RCVTIMEO*/

for netconn_recv, it the same thing.

No more code for users using LWIP_SO_RCVTIMEO=0, a little bit for users using LWIP_SO_RCVTIMEO=1 (+2 tests and +2 set).

For accept, it's very useful when you want to stop some services (some others stack allows to do a "close" on a socket currently use in a "accept", but don't try with lwIP ;) )

Frédéric Bernon <fbernon>
Project MemberIn charge of this item.


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2007-05-24 fbernon StatusNone => Done
        Open/ClosedOpen => Closed

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