On 31/10/2012 14:24, James Carlson wrote:
On 10/31/2012 8:34 AM, Udo Grabowski (IMK) wrote:
I don't know where you get your information from, this original
documentation says something else:
<http://docs.oracle.com/cd/E19205-01/820-7598/bjars/index.html>
PSARC 2001/287 is the source of most of it. I was an employee of Sun
from 2000 through 2009, and was chair of the Platform Software
Architecture Review Committee (PSARC) for much of that time.
Compiling "successfully" without _REENTRANT does NOT mean that
the program actually RUNS flawlessly in a multithreaded environment
under all conditions. One source also says that -mt changes dummy
locks to real locks, and I don't think you want dummy locks in
a mutlithreaded program...
False.
The old dummy-lock crap went away with Solaris 10. That's the essence
of this comment in the libpthread man page:
Historically, functions in this library provided POSIX
threading support. See standards(5). This functionality now
resides in libc(3LIB).
It turned out that the dummy locks were *MUCH* harder to maintain (test
and code around) than the real thing, and the real thing is just as
cheap in terms of performance. That's why Roger Faulkner (raf) merged
it all into libc.
> ....
Or is all this documentation totally outdated and wrong ??
It's outdated. The Sun Studio folks are a completely separate group
from the folks who actually built Solaris. The two groups have little
technical contact.
> ....
Thanks a lot for this info, it's a pity that this isn't documented
well, I also read the Multithread Guide
<http://docs.oracle.com/cd/E19253-01/816-5137/compile-74765/index.html>
and it's all not entirely complete nor completely consistent...
confusing, at best.
--
Dr.Udo Grabowski Inst.f.Meteorology a.Climate Research IMK-ASF-SAT
www-imk.fzk.de/asf/sat/grabowski/ www.imk-asf.kit.edu/english/sat.php
KIT - Karlsruhe Institute of Technology http://www.kit.edu
Postfach 3640,76021 Karlsruhe,Germany T:(+49)721 608-26026 F:-926026
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