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From: wagner@iaoobelix.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Suspending processes - (nf)
Message-ID: <8200002@iaoobelix.UUCP>
Date: Mon, 12-Jan-87 21:29:00 EST
Article-I.D.: iaoobeli.8200002
Posted: Mon Jan 12 21:29:00 1987
Date-Received: Sun, 18-Jan-87 00:20:30 EST
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Nf-From: iaoobelix!wagner    Jan 13 03:29:00 1987

/***** 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