On Tue, 12 Oct 1999, Rohit Dube wrote:
> Hi,
>
> Looking through the mailing list archives, support for threaded
> applications wasn't quite clear to me so I ask here. I have a
> threaded application working on Red Hat Linux 6.0 which uses pthreads.
> I was trying to port it over to FreeBSD 3.3 on a 2 processor intel machine.
> Not having done threaded work on FreeBSD before, I need to figure out what
> compiler-options/libraries/kernel to use for the port -
The linux version will work out of the box - however you will have to add
a couple of options to your kernel config file to keep syslog from
overwhelming you with bogus warnings.
>
> a) What do I need to do, to compile an application which uses pthreads
> on freebsd 3.3. The gcc (2.7.2.3) man page suggests that it should
> be invoked with -pthread. Is that sufficient or do I also need to recompile
> the standard libraries with DTHREAD_SAFE? How about with gcc295
> (which comes on the 3.3 CD), it doesn't seem to have this option
> at all, going by the man page.
-pthread will work just fine. FreeBSD does not have _r calls for
everything yet. Keep in mind that Linux's _r calls are not POSIX
compliant, i.e. they are different from every other UNIX with threads.
> b) The mailing list archives seem to suggest that on freebsd (at least
> upto 3.2), a (p)thread doesn't map to a kernel thread. I.e scheduling
> of (p)threads in a process is done in user space. Is there any way at
> all to map a user-level thread to a kernel thread 1:1? Again there seems
> to be -kthread option for gcc (2.7.2.3) but none for gcc295.
Don't know - for I/O bound activity kernel threads are a really bad idea.
> c) Is the generic 3.3 default kernel threaded and able to run a multiprocessor
> machine or do I need to build a custom kernel with specific options.
You will need to rebuild for SMP. See LINT for details.
>
> Sorry my freebsd is a bit rusty as I have been away for more than a year.
> Thanks,
> --rohit.
>
>
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>
-Kip
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