Pthreads and GDB?

Tue Jul 12 14:17:00 GMT 2011

On Tue, Jul 12, 2011 at 06:16:14AM -0400, Jan Chludzinski wrote:
>I went to GNU.org to read about GDB and threads since I'm having
>trouble working with ptheads under GDB on Cygwin. I notice this on
>the GNU.org web site:
>>"Warning: These facilities are not yet available on every GDB
>configuration where the operating system supports threads. If your GDB
>does not support threads, these commands have no effect. For example,
>a system without thread support shows no output from `info threads',
>and always rejects the thread command, like this:"
>>What the level of support for threads with GDB under Cygwin?
>>Switching between threads causes seg-faults. Also, I thought that
>while you're stepping through one thread, the other threads weren't
>running? Shouldn't I be able to set a breakpoint in a thread before
>pthread_create() is invoked? Doesn't appear to be the case?

Since cygwin1.dll is multithreaded, I routinely set breakpoints which
are only hit in a thread. So, yes, gdb is supposed to be multi-thread
aware.
cgf
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