Suspending processes - (nf)

[wagner at iaoobelix.UUCP]

/***** iaoobelix:comp.unix.ques / A60!lee /  4:13 pm  Jan  9, 1987*/

>   Does UNIX provide a standard way to suspend a processes ( stop it
> from getting CPU time )?
> -- 
> Gene Lee           UUCP: ...ihnp4!{meccts,dayton,rosevax}!ems!A60!lee
> Sperry Corporation     ATT:  (612) 635-6334

There are two possiblilities:

	Use something like kill(pid,SIGSTOP) to suspend the process
	and use kill(pid,SIGCONT) to resume. Note: These signals
	cannot be blocked, so this is a safe way to suspend a
	process.

	Setup a handler which suspends the process upon receiving a
	specific signal, and  which wakes up when it receives another
	signal. (see man pages for sigpause(2), signal(2)).

Of course a process can suspend itself at any time it wants to:
just call sleep(3) or usleep(3)...

Juergen Wagner,			(USENET)   ...!unido!iaoobel!wagner
				Fraunhofer Institute IAO, Stuttgart