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From Adel Boutros <adelbout...@live.com>
Subject Re: [Qpid Dispatcher] Runtime behavior on SunOS
Date Tue, 19 Apr 2016 16:37:38 GMT
Hello Ted,

After reducing the number of threads to 1 and some debugging, we have found
the problem is actually related to *pipe *and *poll *calls on Solaris/Linux.

In the test, we define 2 file descriptors, one for read and one for write in
ufd_write = qd_user_fd(qd, fd[1], (void*) 1);
ufd_read  = qd_user_fd(qd, fd[0], (void*) 0);

When comparing between Linux and Solaris, in
*src/posix.driver.c:qdpn_driver_wait_2()* , we find that the first call to
poll will set the "revents" of the "fd[0]" to 0 on Linux and then it is
always non-zero. Whereas on Solaris it is always non-zero.

Do you have an idea why the "revents" is never "0" on Solaris?

When debugging in *qdpn_driver_wait_2*, *fd[0]* is actually represented by
d->fds[2]. So to see the revents, you can output the value of

Checking the man of poll, a positive value of revents indicated there are
events to read on the pipe whereas a 0 value indicates nothing to read.

PS: We are working on Qpid-dispatch 0.5.0

Adel Boutros

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