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 HPUX

pause

pause(2)							System Calls Manual							  pause(2)

NAME

       pause - suspend process until signal

SYNOPSIS

DESCRIPTION

       suspends  the  calling  process	until  it  receives  a	signal.  The signal must be one that is not currently set to be ignored or blocked
       (masked) by the calling process.

       If the signal causes termination of the calling process, does not return.

       If the signal is by the calling process and control is returned from the signal-catching function  (see	signal(5)),  the  calling  process
       resumes execution from the point of suspension; with a return value of -1 from and set to

APPLICATION USAGE

   Threads Considerations
       Signal dispositions (such as catch/default/ignore) are shared by all threads in the process and blocked signal masks are maintained by each
       thread.	Therefore, the signals being waited for should not be ignored by the process or blocked by the calling thread.

       will suspend only the calling thread until it receives a signal.

       If other threads in the process do not block the signal, the signal may be delivered to another thread in the process and the thread in may
       continue waiting.  For this reason, the use of is recommended instead of for multi-threaded applications.

       For more information regarding signals and threads, refer to signal(5).

SEE ALSO

       alarm(2), kill(2), sigwait(2), wait(2), signal(5).

STANDARDS CONFORMANCE

																	  pause(2)

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