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about Semaphores
Post 302540685 by pflynn on Thursday 21st of July 2011 10:40:16 AM
07-21-2011
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1. Programming
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)
Discussion started by: joseph_shibu
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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?
Here is what I get listing the current semaphores
# ipcs -sp... (1 Reply)
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3. Programming
Hi there,
Could someone please confirm which POSIX semaphore routines should be used for a multiprocess (and not multithreaded) environment?
sys/sem.h definitely works. but the routines, semget, semctl, semop are pretty unwieldy. So, I am looking for an easier way out.
From the man pages... (2 Replies)
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4. Shell Programming and Scripting
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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5. Programming
been searching around on how to use an up and down function with semaphores but i can't find an example. i looked into using: "semop" but i have no idea how to use it. I have been able to declared the semaphores using semget and initializing them using semctl. (7 Replies)
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6. UNIX for Advanced & Expert Users
Hello, first of all I apologize if this thread is not in the correct section of this forum, but this one just seemed the most appropriate.
The question I have does not concern Unix specifically, it applies to virtually any OS, however it is in Unix where I learned about this problem.
So, the... (8 Replies)
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7. Programming
Hello,
Iam trying to implement the sleeping barber problem using semaphores and running on UNIX machine. Iam linking it to the thread libraries :
bash-2.03$ g++ sleepingBarber.cpp -lpthread -o sleeping
but when i execute it i get the following error:
bash-2.03$ sleeping
Starting Program... (4 Replies)
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8. Programming
Hello,
I was doing an exercise of semaphores and shared memory, namely the barbers:
-B number of barbers
-S number of chairs
-C number of customers.
I have done already and I compiled the code, but when run I get an error segment. Can not be and it took several days.
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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>
union... (3 Replies)
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10. Solaris
Hi,
Can somebody please explain me what semaphores are? there purpose? and there effects?
Thanks in advance:) (0 Replies)
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LEARN ABOUT DEBIAN
gems-server
GEMS-SERVER(1) gems documentation GEMS-SERVER(1) NAME
gems-server - Transmit a shell session in real time. SYNOPSIS
gems-server [-ip ip] [-port p] [-maxconn n] [-wait m] [-log dest] [-noscript] [-script_bin script] gems-server -h | -v DESCRIPTION
Transmits a shell session to be shown in real time in various different computers or terminals. gems-server transmits data in real time to clients via a network connection. Each one of these clients must run the gems-client(1) program to establish connection and receive the transmitted data. Clients can connect and disconnect at any given time, but of course they will only receive the data that is transmitted while they are connected (just like a radio transmission/reception system). The gems system is normally used to transmit a console session and show it in various computers at the same time, but it is also possible to transmit any other kind of data. OPTIONS
-ip IP address where connections will be accepted. -port TCP port. Default: 6666. -maxconn Do not accept more than n simultaneous clients. Default: 25. -wait Wait until m clients are connected before starting the transmission. This is useful to ensure that the first m clients will receive all data transmitted. The default behavior is to start transmission immediately, without waiting for client connections. -log By default, the server does not write log messages. This option configures the destination of logs. The dest argument can be `sys- log' (to log through syslogd(8)), `stderr' (to log through standard error output), or it can be an arbitrary filename (log messages will be appended to the file, if it exists). -noscript By default, the server executes the script(1) program to take terminal data and transmit it. When this option is used the server will not run script, and data will be read form standard input. -script_bin Specifies the location of the script(1). program. Default: /usr/bin/script. -h Show a short help message. -v Show version information. FILES
/var/lock/gems-server.PORT Lock file. gems-server creates this file on initialization and deletes it on exit. PORT is replaced by the TCP port used. gems- server will not run if this file is already present in the system. AUTHORS
Diego Essaya <dessaya@fi.uba.ar> Emiliano Castagnari <ecastag@fi.uba.ar> SEE ALSO
gems-client(1), script(1), syslogd(8) gems AUGUST 2004 GEMS-SERVER(1)