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From: "Evan Pollan" <evan_pollan AT yahoo DOT com>
To: <cygwin AT cygwin DOT com>
Subject: Segmentation fault when using gdb & pthreads
Date: Thu, 6 Dec 2001 22:23:53 -0500
Message-ID: <BKEEJPNONNBIJFHGBKHJCEDPCAAA.evan_pollan@yahoo.com>
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All--

I posted this a few weeks back and didn't get any response.  I've searched
the
archives and haven't seen anything helpful, so I'm reposting...

I'm trying to use gdb on a simple pthreads app. The app runs fine, but I
wanted
to give the gdb a test drive.  However, whenever I step into or over any
pthread code, I get a segmentation fault.  In my case, a call to
pthread_cond_init() causes the SIGSEGV.

The code is compiled w/ -g, and I can step through the execution for
everything
up to the pthreads code.  Is this a limitation w/ gdb or am I missing either
a
compilation or debugging flag?  I'm using the full cygwin distribution as of
cygwin-1.3.5-3 on Win2000.

Here's the seg fault as it appears when I encounter the pthread_cond_init()
call:

    (gdb) run
    Starting program:
/cygdrive/c/home/Evan/src/c++/QueueProcessor/Driver.exe

    Breakpoint 1, QueueProcessor::QueueProcessor (this=0x22fd54)
        at QueueProcessor.cpp:39
    39    {
    Current language:  auto; currently c++
    (gdb) step
    41    rc = pthread_cond_init(&_condition, NULL);
    (gdb) print rc
    $1 = 0
    (gdb) step

    Program received signal SIGSEGV, Segmentation fault.
    0x77e86e72 in _libkernel32_a_iname ()
    (gdb)


thanks for the help,
Evan


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