Threads support faulty in R8B-0 and R8B-1?

Leonid Timochouk <>
Fri May 17 17:09:10 CEST 2002

Hello Erlang users,

I am using Erlang/OTP R8B-0 (and now R8B-1) on Debian Linux with glibc
2.2.5, kernel 2.4.18. In both cases, "beam" blocks immediately on start-up
if invoked with a non-0 number of threads via the "+A" option, does not
even display the initial "Erlang (BEAM) emulator version ..." message. It
does create 3 threads, though, and the first of them can be observed with
a debugger. It has the following call stack (blocked at "sigsuspend"):

#0  0x400daa0e in sigsuspend () from /lib/
#1  0x400a0629 in __pthread_wait_for_restart_signal ()
   from /lib/
#2  0x4009fe2c in pthread_create@@GLIBC_2.1 () from /lib/
#3  0x0809b33a in erts_thread_create (tpp=0x83b3498,
    func=0x809abac <async_main>, arg=0x83b3490, detached=0)
    at sys/unix/sys_threads.c:226
#4  0x0809b029 in init_async (hndl=4) at beam/erl_async.c:90
#5  0x080b5f74 in async_drv_start (port_num=1, name=0x80e38bc "async",
    opts=0xbffff750) at sys/unix/sys.c:1798
#6  0x08070098 in open_driver (driver=0x8102540, pid=7,
    name=0x80e38bc "async", opts=0xbffff750) at beam/io.c:285
#7  0x080b6515 in sys_init_io (buf=0x8134700 "", size=65536)
    at sys/unix/sys.c:2175
#8  0x08070e0e in init_io () at beam/io.c:725
#9  0x0805b8c9 in erl_init () at beam/erl_init.c:200
#10 0x0805c171 in erl_start (argc=10, argv=0xbffffb04) at
#11 0x0805b82b in main (argc=10, argv=0xbffffb04) at
#12 0x400ca65f in __libc_start_main () from /lib/

Anyone has an idea what's going on?

Best regards,

Leonid Timochouk
Computing Laboratory
University of Kent at Canterbury

More information about the erlang-questions mailing list