[lwip-devel] [bug #20021] conn->sem is only signaled one-way

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?20021>

                 Summary: conn->sem is only signaled one-way
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Donnerstag 31.05.2007 um 16:43
                Category: None
                Severity: 5 - Blocker
              Item Group: Crash Error
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

In api_msg.c, sent_tcp() signals the conn->sem semaphore every time something
is sent. But the sem is only waited for when ERR_MEM is returned (either if
there is not enough memory or the TCP window is full).
That way, if you only send small data and have enough memory, the semaphore
can be signalled into heaven ;-)

Proposed change: include a state variable like "someone's waiting" and only
signal the semaphore when someone _is_ waiting for more data to show.




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