Count Number Of Threads in a Process Post: 33183

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Top Forums Programming Count Number Of Threads in a Process Post 33183 by S.P.Prasad on Wednesday 18th of December 2002 11:59:42 PM

12-19-2002

Registered User

We are working on SunOS Rel 5.8.Infact I have worked on the method - counting the number of subdirectories in the /proc/[pid]/lwp by using the following algorithm :

.......
/* After I have found the pid of the required process */
sprintf ( Dir , "/proc/%d/lwp" , pid ) ;
if ( ! chdir ( Dir ) ) {
Counter = 0 ;
if ((dp = opendir ( Dir ))!= NULL) {
while((dirp=readdir(dp))!=NULL)
if(dirp->d_name[0]!='.') Counter ++ ;
}
}
.......
I get the right count of subdirectories in the variable Counter. But the threads created in the program does not matches in number to subdirectories in /proc/[pid]/lwp. For example in an application I have created two thread by using pthread_create but number of subdirectories created in lwp directory for that process is five.I am not able to figure it as to why this difference exists.

S.P.Prasad

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LEARN ABOUT NETBSD

_lwp_unpark

_LWP_UNPARK(2)						      BSD System Calls Manual						    _LWP_UNPARK(2)

NAME

     _lwp_unpark -- resume execution of a waiting LWP

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <lwp.h>

     int
     _lwp_unpark(lwpid_t lwp, const void *hint);

DESCRIPTION

     _lwp_unpark() resumes execution of the light-weight process lwp.

     The target LWP is assumed to be waiting in the kernel as a result of a call to _lwp_park().  If the target LWP is not currently waiting, it
     will return immediately upon the next call to _lwp_park().

     See _lwp_park(2) for a description of the hint argument.

RETURN VALUES

     A 0 value indicates that the call succeeded.  A -1 return value indicates an error occurred and errno is set to indicate the reason.

ERRORS

     [ESRCH]   No LWP can be found in the current process corresponding to that specified by lwp.

SEE ALSO

     _lwp_park(2), _lwp_unpark_all(2), _lwp_wakeup(2)

HISTORY

     The _lwp_unpark() system call first appeared in NetBSD 5.0.

BSD
								 January 20, 2007							       BSD

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