RE: TCPProblem -- more info -- short program that hangs included

[Chad Yates]

Don't know what your problem is, but I've converted your test routine to a
testcase of a TCPStream test fixture.  It seems to run fine under
msvc++6.0/win32  I originally had the loop terminate after 1000 reps
(instead of infinity), but have moved it down to 50 in the provided code.

attached is a zip file with the sourcefiles, and a new msvc++ project file.
the last msvc project file I sent for the test suite didn't seem to get the
references to the source files (my bad, I think I sent the wrong version
when i was cleaning things up), so unless someone has made changes to the
.dsp file, I'd recommend replacing it with this version.

,chad



> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden Behalf Of
> Alex Pavloff
> Sent: Friday, February 07, 2003 11:59 AM
> To: 'address@hidden'
> Subject: TCPProblem -- more info -- short program that hangs included
>
>
>
> Here is a sample program that duplicates the problems I described
> yesterday.
> What's going on here?  Is it CC++ that's broken or gcc?  Would
> other people
> try this and see what the result is?  It appears that after 32 or
> 33 quickly
> repeated call to isPending(), something breaks horribly.
>
>
> #include <cc++/socket.h>
>
> int main()
> {
>       try
>       {
>               // Just connect to a port that won't send data -- doesn't
> matter what
>               ost::TCPStream foo("10.0.0.5",5800,512,true,100);
>               for( ; ; )
>               {
>                       while( foo.isPending(ost::Socket::pendingInput,100)
> );
>               }
>       }
>       catch( ost::Socket* s )
>       {
>               std::cout << "Socket error" << std::endl;
>       }
>       return 0;
> }
>
>    Here is the GDB backtrace.  Notice how the this pointer got completely
> clobbered
>    resulting in a massively large value being passed to poll(),
> which causes
> the hang
>    but what causes the clobbering in the first place?
>
> (gdb) bt
> #0  0x420d224b in poll () from /lib/i686/libc.so.6
> #1  0x4004436f in ost::Socket::isPending(ost::Socket::Pending, unsigned
> long) (
>     this=0xfffffffc, pending=53, timeout=3221222896) at socket.cpp:502
> #2  0x400466bc in ost::TCPStream::isPending(ost::Socket::Pending, unsigned
> long) (this=0xbffff670, pending=pendingInput, timeout=100) at
> socket.cpp:1158
> #3  0x0804903e in main () at cute.cpp:12
> #4  0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6
>
>
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Test_TCPStream.zip
Description: Zip compressed data