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Solaris
Semaphores getting created, thus blocking start of Webserver ctl
Post 302365854 by thariqueakbar on Wednesday 28th of October 2009 07:38:38 AM
10-28-2009
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Dear Reader,
I'm in a multiprocess environment working with shared mem and semaphores as mutex.. The problem is -- If one of the process hooked up with the semaphore and accessing the shared mem, terminates abruptly ( or got killed ), other process which are in want of the semaphore are... (1 Reply)
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Hi all,
I am using HP 10.20 on A 9000/785. My question is:
If I am the only person logged in as root at the moment, how many "semaphore proccesses" should I have?? Is it only one, or it is relevant to other system proccesses?
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Hi there,
Could someone please confirm which POSIX semaphore routines should be used for a multiprocess (and not multithreaded) environment?
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Hi Friends,
If i execute this command it comes back with 300 lines:
ipcs|grep cerebrus >>> i would like to clear the semaphores but ipcrm can remove one id at a time. is there a quicker way of removing semaphores maybe using awk?
Regards, (1 Reply)
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I am having problem with semaphores. I am trying to protect line where process prints so that every process with print in proper order.This is the code..
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/types.h>
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LEARN ABOUT FREEBSD
ipcrm
IPCRM(1) BSD General Commands Manual IPCRM(1) NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared segments SYNOPSIS
ipcrm [-W] [-v] [-q msqid] [-m shmid] [-s semid] [-Q msgkey] [-M shmkey] [-S semkey] ... DESCRIPTION
The ipcrm utility removes the specified message queues, semaphores and shared memory segments. These System V IPC objects can be specified by their creation ID or any associated key. The following options are generic: -v If specified once with -W or with -1 for an object, it will show all removed objects. If specified twice with -W or with -1 for an objects, it will show all removed objects and all failed removals. -W Try to wipe all specified message queues, semaphores and shared memory segments. -y Use the kvm(3) interface instead of the sysctl(3) interface to extract the required information. If ipcrm is to operate on the run- ning system, using kvm(3) will require read privileges to /dev/kmem. The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used: -q msqid Remove the message queue associated with the ID msqid from the system. -m shmid Mark the shared memory segment associated with ID shmid for removal. This marked segment will be destroyed after the last detach. -s semid Remove the semaphore set associated with ID semid from the system. -Q msgkey Remove the message queue associated with key msgkey from the system. -M shmkey Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach. -S semkey Remove the semaphore set associated with key semkey from the system. The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1). If the identifier or the key is -1, it will remove all these objects. SEE ALSO
ipcs(1) HISTORY
The wiping of all System V IPC objects was first implemented in FreeBSD 6.4 and 7.1. AUTHORS
The original author was Adam Glass. The wiping of all System V IPC objects was thought up by Callum Gibson and extended and implemented by Edwin Groothuis. BSD
December 12, 2007 BSD