Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Semaphore script
Top Forums Programming Semaphore script Post 302961788 by Don Cragun on Thursday 3rd of December 2015 03:47:42 PM
Old 12-03-2015
Is this a homework assignment?

If you know how long it is going to take to print something before you send it to the printer, what you have is a scheduling problem; not a semaphore problem. (But, if you think you know how long it will take to print something before it completes printing, you have obviously never used a real printer; which will invariably run out of paper, toner, etc.; at the worst possible time.)

If this is a homework assignment, please close this thread and repost it in the Homework & Coursework Forum with a completely filled out homework template. Otherwise, please give a much clearer description of what problem you are trying to solve, tell us what operating system and shell you're using, and show us what you have do so far to solve this problem.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

semaphore

hi, is there any command where we can monitor semaphores? (1 Reply)
Discussion started by: yls177
1 Replies

2. UNIX for Dummies Questions & Answers

Semaphore

Hi, I'm new to UNIX. I need to know what's a semaphore Do reply. Thanks VJ (3 Replies)
Discussion started by: vjsony
3 Replies

3. Solaris

Semaphore Error

Hi, Getting the following error while starting any application on solaris server(Sun-Fire-880) . WARNING ( 357): CORE3283: stderr: 357: CSemCounter created a semaphore with ID 1442787 using key 989897871. WARNING ( 357): CORE3283: stderr: 357: RemoveSem removed semaphore 1442787. ... (1 Reply)
Discussion started by: 009satyendra
1 Replies

4. Shell Programming and Scripting

Semaphore

Hi, I am looking to use a semaphore for the first time in one of my scripts. I am just wondering if there are any simple examples or tutorials around? I am a beginner so the simpler the better :) Thanks -Jaken (2 Replies)
Discussion started by: Jaken
2 Replies

5. UNIX for Dummies Questions & Answers

semaphore

what is semaphore? can any body explain it in a more simple way than the manual ?? replies appreciated Regards raguram R (7 Replies)
Discussion started by: raguramtgr
7 Replies

6. Programming

Semaphore

In my server code there is a thread per client... The server call accept() and after that start the thread. So there is a thread for client that save in RAM the client's message, that will be send to other clients. Now in RAM I have created a shared memory in which thread read and write(save)... (2 Replies)
Discussion started by: italian_boy
2 Replies

7. Shell Programming and Scripting

semaphore

Control two exclusively shared resources(semaphore). The two resources are two files. The producer will write even numbers to one file, and odd numbers to another one. The consumer respectively reads from each file until it gets 5 even numbers and 5 odd numbers. Can any one help me with the... (0 Replies)
Discussion started by: gokult
0 Replies

8. Programming

Semaphore

If I create a semaphore and then I fork a number of child processes then all the child process use that same semaphore. Since the process address spaces are different rfom each other then how all the child process are able to access the same semaphore? I understand that semaphore/mutex is at os... (0 Replies)
Discussion started by: rupeshkp728
0 Replies

9. Solaris

Semaphore

Can anyone tell me abt the Semaphore concept and what is semaphore??? is semaphore id is associated in terms as in resources like semaphore id 1 indicates cpu share unit is given and semaphore id 2 will indicate abt the memore or semaphore id 3 will tell us the i/o components (1 Reply)
Discussion started by: aarjun07
1 Replies

10. UNIX for Beginners Questions & Answers

Semaphore

I was asked to add this piece of code to a c program which I will execute through the shell: for(long i = 0; i < NITER; i++) { sem_wait( &sema); count++; sem_post( &sema); } I didn't get it, which is the critical section ? if it's "count++" how would a thread wake up in order to enter it... (1 Reply)
Discussion started by: uniran
1 Replies

LEARN ABOUT OSX

enable

enable(1)                                                          User Commands                                                         enable(1)

NAME

       enable, disable - enable/disable LP printers

SYNOPSIS

       /usr/bin/enable printer...

       /usr/bin/disable [-c | -W]  [ -r [reason]] printer...

DESCRIPTION

       The  enable  command  activates  printers,  enabling  them to print requests submitted by the lp command. enable must be run on the printer
       server.

       The disable command deactivates printers, disabling them from printing requests submitted by the lp command. By default, any requests  that
       are  currently  printing  on printer will be reprinted in their entirety either on printer or another member of the same class of printers.
       The disable command must be run on the print server.

       Use lpstat -p to check the status of printers.

       enable and disable only effect queueing on the print server's spooling system. Executing these commands from a client system will  have  no
       effect on the server.

OPTIONS

       The following options are supported for use with disable:

       -c              Cancels  any requests that are currently printing on printer. This option cannot be used with the -W option. If the printer
                       is remote, the -c option will be silently ignored.

       -W              Waits until the request currently being printed is finished before disabling printer. This option cannot be used  with  the
                       -c option. If the printer is remote, the -W option will be silently ignored.

       -r [reason]     Assigns  a  reason  for  the  disabling  of  the  printer(s). This reason applies to all printers specified. This reason is
                       reported by lpstat -p. Enclose reason in quotes if it contains blanks. The default  reason  is  "unknown  reason"  for  the
                       existing printer, and "new printer" for a printer added to the system but not yet enabled.

OPERANDS

       The following operand is supported for both enable and disable:

       printer         The  name of the printer to be enabled or disabled. Specify printer using atomic name. See printers.conf(4) for information
                       regarding the naming conventions for atomic names.

EXIT STATUS

       The following exit values are returned:

       0               Successful completion.

       non-zero        An error occurred.

FILES

       /var/spool/lp/*         LP print queue.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWpcu                      |
       +-----------------------------+-----------------------------+
       |CSI                          |enabled                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       lp(1), lpstat(1), printers.conf(4), attributes(5)

SunOS 5.10                                                          9 Sep 1996                                                           enable(1)
All times are GMT -4. The time now is 12:54 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy