10-12-2006
Hi Hitori,
I don't want to know how to read the process details. I am doing that already. My program will have a list of, lets say, command lines patterns, that it has to match against currently running processes. It will do this in an infinite loop, raising alerts if any of the process patterns are not found in the list of running processes or if the number of matches are too few or too many.
It may have to go through the list of running processes every minute (maybe, depending on the configuration). So, my question is whether it would be better to create a list of command line entries from the /proc every minute and go through my list and match (the entire list of current processes would be processes for every entry in my list), or should I go through the all /proc entries for each of the entries in my list.
The first method involves creating a list of an unknown size but issuing the /proc reading commands (readdir, open, read, stat) just once. The second method requires the readdir, open, read commands to be executed for the entire /proc filesystem for each process pattern in my list.
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LEARN ABOUT HPUX
serialize
serialize(2) System Calls Manual serialize(2)
NAME
serialize() - force target process to run serially with other processes
SYNOPSIS
DESCRIPTION
The system call is used to force the target process referenced by the pid value passed in to run serially with other processes also marked
for serialization. If the value of pid is zero, then the currently running process is marked for serialization. Once a process has been
marked by the process stays marked until process completion, unless is reissued on the serialized process with timeshare set to 1. If
timeshare is set to 1, the process specified in pid will be returned to normal timeshare scheduling algorithms.
This call is used to improve process throughput since process throughput usually increases for large processes when they are executed seri-
ally instead of allowing each program to run for only a short period of time. By running large processes one at a time, the system makes
more efficient use of the CPU as well as system memory, since each process does not end up constantly faulting in its working set, to only
have the pages stolen when another process starts running. As long as there is enough memory in the system, processes marked by behave no
differently from other processes in the system. However, once memory becomes tight, processes marked by are run one at a time with the
highest priority processes being run first. Each process runs for a finite interval of time before another serialized process is allowed
to run.
RETURN VALUE
returns zero upon successful completion, or nonzero if the system call failed.
ERRORS
If fails, it sets (see errno(2)) to the following value:
The pid passed in does not exist.
WARNINGS
The user has no way of forcing an execution order on serialized processes.
AUTHOR
was developed by HP.
SEE ALSO
serialize(1), privileges(5).
serialize(2)