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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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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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