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perlfunc:waitpid

by gods
on Aug 24, 1999 at 22:43 UTC ( #355=perlfunc: print w/replies, xml ) Need Help??

waitpid

See the current Perl documentation for waitpid.

Here is our local, out-dated (pre-5.6) version:


waitpid - wait for a particular child process to die



waitpid PID,FLAGS



Waits for a particular child process to terminate and returns the pid of the deceased process, or -1 if there is no such child process. The status is returned in $?. If you say

    use POSIX ":sys_wait_h";
    #...
    waitpid(-1,&WNOHANG);

then you can do a non-blocking wait for any process. Non-blocking wait is available on machines supporting either the waitpid(2) or wait4(2) system calls. However, waiting for a particular pid with FLAGS of 0 is implemented everywhere. (Perl emulates the system call by remembering the status values of processes that have exited but have not been harvested by the Perl script yet.)

See the perlipc manpage for other examples.


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[ambrus]: Corion: well sure, but that's the similar to any printed document, and the margin is diminishing with today's technology. Video games no longer have to assume that the CRTs won't show the edges of the screen.
[Corion]: If you cram your slides with that much information, they might work in an "offline" situation but not very well for a live presentation IMO
[ambrus]: Corion: in that case I also ask the people who rent the conference rooms to tell conference organizers about the available tech.
[Corion]: ambrus: No, you're misunderstanding. If you place content too far on the left/right/top/ bottom, people might not see it because the view is obstructed ;)(
[Corion]: In Amsterdam, the screen went down to the bottom of the stage (60cm above ground) and the seating was on the ground, meaning that the rows in the back couldn't see the bottom of slides.
[Corion]: There also were some columns that meant that maybe you couldn't see the left/right edge of a slide.
[ambrus]: Corion: Sure. I've had a course in a 50 seat lecture hall that has two fucking columns in the middle.
[Corion]: Talking about it, the top should be fairly visible in the situations I've experienced at least. The top is uncomfortable for people in the first three rows, but that's life ;)
[ambrus]: The pillars are there because this is in the 6th floor of building R of BME, which is an attic that was built in after the original building, which is also why the elevator doesn't go that high and the windows are tiny.
[Corion]: ambrus: Hehe ;) Yeah - such real life stuff is far more inconveniencing than wasting display area due to screen ratio problems :)

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