[uClibc]Status of POSIX Thread Support in uClibc

[David Chan]

> > I'm planning on using some simple POSIX threading in an application
> > designed to run on uClinux/ColdFire using the uClibc library. I
noticed
> > on the "Supported Applications List" that the comment next to
Mozilla
> > mentioned support for POSIX threads. How good is the support so far?
Is
> > the implementation full enough to support something like a
multithreaded
> > web server?

> Sure.  It works fine for me and all the multi-threaded test
> apps I have run...  If you have problems, report them to
> the mailing list so we can get things fixed,

I just finally got around to replacing uClinux-20020701's uClibc version
(0.9.11-uc0) with the latest uClibc version (0.9.14). I compiled it
without a 'HAVE_THREADS' option and tested it -- everything worked. I
noticed while I was setting up my Config file that the
extra/Configs/Config.m68k file didn't have 'HAVE_THREADS = true' as a
potential option. However, Erik said that threads were working for
uClinux/ColdFire, so I copied the line from Config.i386 and recompiled.
While uClibc was compiling, I got this series of assembler errors:


m68k-elf-gcc -Wall -Wall -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing  -fno-builtin -nostdinc -m5307 -I../../include
-iwithprefix include -I. -D_LIBC -Wa,--bitwise-or
-I/work/gp/uClinux-dist/linux-2.4.x/include -DNDEBUG  -D_LIBC_REENTRANT
-I../../libpthread/linuxthreads/sysdeps/unix/sysv/linux
-I../../libpthread/linuxthreads/sysdeps/pthread
-I../../libpthread/linuxthreads/sysdeps/unix/sysv
-I../../libpthread/linuxthreads/sysdeps/unix/unix
-I../../libpthread/linuxthreads/sysdeps/m68k
-I../../libpthread/linuxthreads/sysdeps -I../../libc/sysdeps/linux/m68k
-c pt-machine.c -o pt-machine.o
/tmp/cc4pyQ75.s: Assembler messages:
/tmp/cc4pyQ75.s:12: Error: invalid instruction for this architecture;
needs 68000 or higher -- statement `tas (%a0)' ignored
/tmp/cc4pyQ75.s:12: Error: operands mismatch -- statement `sne -1(%a6)'
ignored
/tmp/cc4pyQ75.s:36: Error: invalid instruction for this architecture;
needs 68020 or higher -- statement `casl %d2,%d0,(%a0)' ignored
/tmp/cc4pyQ75.s:36: Error: operands mismatch -- statement `seq -1(%a6)'
ignored
make[4]: *** [pt-machine.o] Error 1
make[4]: Leaving directory
`/work/gp/uClinux-dist/uClibc/libpthread/linuxthreads'


How exactly do I get this working? I'm kind of stumped at this point and
desperately hoping that uClibc's thread implementation really does
support the ColdFire. 

Thanks,
David Chan