How does one know how many thread a process owns?

[Jiawei Ye]

>From top in pkgsrc, one can know that a certain process has some
number of LWP in it.
load averages:  1.89,  1.72,  1.68;  up 119+05:28:10                   13:30:48
154 processes: 152 sleeping, 1 running, 1 on cpu
CPU states:     % idle,     % user,     % kernel,     % iowait,     % swap
Memory: 1024M real, 414M free, 841M swap in use, 1956M swap free

   PID USERNAME LWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
 21891 bond       1   4    2   19M 1864K run     31.7H 77.04% upd_twd_15min
 17153 bond       1  50    2   82M 6164K sleep   37:37 12.98% dataserver.tsk
 17151 bond       1  53    2   82M   81M sleep   41:57  0.96% dataserver.tsk
 13742 otc        1  53    2   30M   21M sleep    3:31  0.89% dataserver.tsk
 17204 mtrs       1  53    2   82M 6144K sleep    2:47  0.67% dataserver.tsk
 17321 mtrs       1  53    2   25M 7908K sleep    2:21  0.49% otcmgr.tsk
 16250 root       1  59    0 4136K 2224K sleep    0:00  0.47% sshd
 13745 otc        1  53    2   30M 2496K sleep    2:55  0.36% dataserver.tsk
  3821 jessica    1  59    0   31M 4816K sleep    6:25  0.34% dataserver.tsk
 17227 bond       1  53    2   25M 7908K sleep    2:46  0.31% otcmgr.tsk
 17553 otc        1  53    2   17M 1208K sleep    0:46  0.18% icbc_pricing
 16269 leafy      1  45    0 3360K 1688K sleep    0:00  0.13% bash
 17202 mtrs       1  53    2   82M   19M sleep    1:08  0.12% dataserver.tsk
 17154 bond       1  53    2   82M 8004K sleep    0:35  0.12% dataserver.tsk
 13746 otc        1  53    2   30M 5136K sleep    0:37  0.11% dataserver.tsk

In our top, show threads does not tell you how many threads exactly
exists in a process, is there any way to imitate the other top's
behaviour?

Jiawei
-- 
"Without the userland, the kernel is useless."
               --inspired by The Tao of Programming