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Full Discussion: parent called more times - fork - C language
Top Forums Programming parent called more times - fork - C language Post 302498975 by pharaoh on Wednesday 23rd of February 2011 02:39:24 AM
Old 02-23-2011
If you run this piece of code you will have different outcomes. Sometimes the father code can be executed before the son's code and vice-versa, because the operating systems stagger them. And a process has some limited time for accessing the CPU which is called Time Slice, when a process time slice rans out the OS switch to another process that is waiting to be executed.

All you need to know It is how the fork () syscall works and this lit.le concept.

I hope I hellped-
 

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LEARN ABOUT OSF1

lastcomm

lastcomm(8)						      System Manager's Manual						       lastcomm(8)

NAME

       lastcomm - Outputs information about the last commands executed

SYNOPSIS

       lastcomm [Command] [Name] [Tty]

DESCRIPTION

       The  lastcomm  command  outputs	information about all previously executed commands that are recorded in the /var/adm/pacct file in reverse
       chronological order.

       You may specify a particular command with the Command parameter, a particular user with the Name parameter, and a  particular  terminal	as
       the  command  source  with the Tty parameter. Output is then restricted to the specified parameters. A Tty terminal may be named fully (for
       example, tty0) or abbreviated (for example, 0).

       The following information is displayed for each process: Name of the command under which the process was called.  Any flags collected  when
       the  command  was  executed.  The following flags are valid: Command was run with an effective user-id of 0.  Command ran after a fork, but
       without an exec system call following it.  Name of the user who issued the command.  The terminal the command was started from.	Seconds of
       CPU time used.  Time the process started.

EXAMPLES

       To display information about all previously executed commands recorded in the /var/adm/pacct file, enter: lastcomm Information is displayed
       similar to: lastcomm    ajh	lat/620        1.13 secs Thu Feb 24 15:02 pg	      ajh      lat/620	      5.91 secs Thu Feb  24  15:01
       ln	    miller    ttyp1	      1.14  secs  Thu  Feb  24	15:01  ls	    rob       ttyp1	     0.02 secs Thu Feb 24 15:01 pg
       sjz	ttyp1	       0.33 secs Thu Feb 24 15:00 sendmail SF root     __	      0.01 secs Thu Feb 24 15:00  To  display  information
       about commands named a.out executed by the root user on terminal ttyd0, enter: lastcomm a.out root ttyd0

FILES

       Specifies the command path.  The current accounting file.

RELATED INFORMATION

       Commands:  last(8) delim off

																       lastcomm(8)
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