Martin wrote:
On 11/09/2011 16:44, Mark Morgan Lloyd wrote:
- If it doesn't work without the dev/null then it may be that your
system doesn't do none blocking read => but then it should return an
erro when trying to set that property on the handle.
Without an explicit /dev/null it locks up as before.
- If it does work without the dev/null then it would be intersting
(debugln) to find out what error occurs, and to see if it could be
made working somehow (without threads)
With an explicit /dev/null it appears to work fine.
Ok at least a workaround....
Lazarus is still building for ARM, I'll report back when I know how
that looks. I'll also check the exact kernel versions that the test
systems have running, in case there's some problem.
I'll see if I find the time => it should be simple to copy the code from
unit GDBMIClasses) TPseoudoTerminal.Open /Read and make a small test
app, that will open a pseudo terminal, set the handle to none-blocking
read, and call read on it => and test if read will block or not.
This system is not OK:
SPARC: Linux pye-dev-04 2.6.26-2-sparc64 #1 Mon Jun 13 17:02:25 UTC 2011
sparc64 GNU/Linux
GNU gdb 6.8-debian
These systems are OK:
ARM: Linux pye-dev-07a 2.6.32-5-versatile #1 Tue Mar 8 19:11:56 UTC 2011
armv5tejl GNU/Linux
GNU gdb (GDB) 7.0.1-debian
x86: Linux pye-dev-02 2.6.32 #1 SMP Thu Dec 10 15:56:27 GMT 2009 i686
GNU/Linux
GNU gdb 6.8-debian
PPC: Linux pye-dev-05 2.6.26-2-powerpc #1 Wed May 12 23:44:56 UTC 2010
ppc GNU/Linux
GNU gdb 6.8-debian
SPARC: SunOS pye-dev-08 5.10 Generic_118833-17 sun4u sparc
SUNW,Sun-Fire-280R Solaris
GNU gdb 6.8
All above trunk (r32275 approx) with 2.4.4. Given that the problem is
seen on SPARC Linux:
* the fact that PPC is OK suggests that it's not an endianness issue.
* the fact that SPARC on Solaris and ARM on Linux are OK suggests that
it's not an alignment issue.
* we also know that it's not directly associated with a kernel or gdb
version.
I think that leaves the prime suspect being some constant that varies on
a platform by platform basis. s/constant/value/ :-)
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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