[I'm not sure if this should go here or fpc-devel]
Hello,
I'm quite impressed by the native arm compiler that I grabbed here ftp://ftp.freepascal.org/pub/fpc/beta/2.1.2/arm-linux/. My small but relatively complex program (with various threads using synchronize and critical sections, c library with callbacks to pascal, etc.) is working flawlessly in the foreground, but it segfaults if I try to background it (or try to use fpFork), and this is a problem since I want to write a daemon (i can use screen though if that isn't possible).
This small program exhibits the same problem:
---8<-------8<-------8<-------8<----------
program test;
{$mode objfpc}{$H+}
uses cthreads,sysutils,classes;
type
tmt=class(TThread)
procedure execute;override;
end;
var
mt:tmt;
procedure tmt.execute;
begin
while not terminated do sleep(100);
end;
begin
mt:=tmt.create(false);
sleep(5000);
write('press enter to finish');
readln;
mt.free;
end.
---8<-------8<-------8<-------8<----------If you try to bacground it with ctrl+z during the sleep(5000) it will segfaults:
./test
[1]+ Stopped ./test
fg
./test
An unhandled exception occurred at $BEE2C9C8 :
EAccessViolation : Access violation
$BEE2C9C8
$000103B0
If you remove the thread or try to background it after the sleep there's no problem. Also the same program under i386 (but compiled with fpc 2.0.4) has no such problem.
I'm running it on a linkstation pro with freelink (debian etch):
cat /proc/cpuinfo
Processor : ARM926EJ-Sid(wb) rev 0 (v5l)
BogoMIPS : 266.24
Features : swp half thumb fastmult edsp java CPU implementer : 0x41
CPU architecture: 5TEJ
CPU variant : 0x0
CPU part : 0x926
CPU revision : 0
Cache type : write-back
Cache clean : cp15 c7 ops
Cache lockdown : format C
Cache format : Harvard
I size : 32768
I assoc : 1
I line length : 32
I sets : 1024
D size : 32768
D assoc : 1
D line length : 32
D sets : 1024
Hardware : MV-88fxx81
Revision : 0000
Serial : 0000000000000000
uname -a
Linux lspro 2.6.12.6-arm1 #77 Tue Dec 5 22:23:46 CST 2006 armv5tejl GNU/Linux
Bye