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Full Discussion: Count Number Of Threads in a Process
Top Forums Programming Count Number Of Threads in a Process Post 33261 by S.P.Prasad on Tuesday 24th of December 2002 06:19:34 AM
Old 12-24-2002
In a simple C program like the following :
/* program :- One.c */
main ( )
{
printf ( "Hi To Everyone !\n" ) ;
for ( ; ; ) ;
}
which is compiled with the following command :
cc One.c
and later executed, I found that in the /proc/[pid]/lwp only one subdirectory exists, but when the same program is compiled with following option :
cc One.c -lpthread
and later executed, the lwp directory of its pid in /proc filesystem shows presence of three subdirectories.
Why does it happens so ?
 

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LEARN ABOUT OPENSOLARIS

td_ta_get_nthreads

td_ta_get_nthreads(3C_DB)				Threads Debugging Library Functions				 td_ta_get_nthreads(3C_DB)

NAME

       td_ta_get_nthreads - gets the total number of threads in a process for libc_db

SYNOPSIS

       cc [ flag... ] file... -lc_db [ library... ]
       #include <proc_service.h>
       #include <thread_db.h>

       td_err_e td_ta_get_nthreads(const td_thragent_t *ta_p, int *nthread_p);

DESCRIPTION

       The  td_ta_get_nthreads()  function  returns  the total number of threads in process ta_p, including any system threads. System threads are
       those created by libc or libc_db on its own behalf. The number of threads is written into  *nthread_p.

RETURN VALUES

       TD_OK	   The call completed successfully.

       TD_BADTA    An invalid internal process handle was passed in.

       TD_BADPH    There is a NULL external process handle associated with this internal process handle.

       TD_DBERR    A call to one of the imported interface routines failed.

       TD_ERR	   The nthread_p argument was NULL, or a libc_db internal error occurred.

ATTRIBUTES

       See attributes(5) for description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libc_db(3LIB), attributes(5), threads(5)

SunOS 5.11							    20 Oct 1998 					 td_ta_get_nthreads(3C_DB)
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