what's the difference between signal and semaphore? Post: 302524089

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

semaphore

hi, is there any command where we can monitor semaphores?

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. Shell Programming and Scripting

can any one tell me how to run a semaphore. i understand roughly how they work code wise, but i'm not sure how to make use of them. i have two client programs in csh that perform tasks on a server file (flat file) how the i get the semaphore to lock the file when one has accessed it and how to use...

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

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

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)...

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...

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...

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

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...

LEARN ABOUT MOJAVE

sem_unlink

SEM_UNLINK(2)						      BSD System Calls Manual						     SEM_UNLINK(2)

NAME

     sem_unlink -- remove a named semaphore

SYNOPSIS

     #include <semaphore.h>

     int
     sem_unlink(const char *name);

DESCRIPTION

     The named semaphore named name is removed.  If the semaphore is in use by other processes, then name is immediately disassociated with the
     semaphore, but the semaphore itself will not be removed until all references to it have been closed.  Subsequent calls to sem_open() using
     name will refer to or create a new semaphore named name.

     If successful, sem_unlink() will return 0.  Otherwise, -1 is returned and errno is set, and the state of the semaphore is unchanged.

ERRORS

     sem_unlink() succeeds unless:

     [EACCES]		Permission is denied to be remove the semaphore.

     [ENAMETOOLONG]	name exceeded PSEMNAMLEN characters.

     [ENOENT]		The named semaphore does not exist.

SEE ALSO

     sem_close(2), sem_open(2), semctl(2), semget(2), semop(2)

HISTORY

     sem_unlink() is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995).

Darwin								   June 8, 2000 							    Darwin

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

semaphore

Discussion started by: yls177

2. UNIX for Dummies Questions & Answers

Semaphore

Discussion started by: vjsony

3. Shell Programming and Scripting

making use of a Semaphore

Discussion started by: FDavid

4. Shell Programming and Scripting

Semaphore

Discussion started by: Jaken

5. UNIX for Dummies Questions & Answers

semaphore

Discussion started by: raguramtgr

6. Programming

Semaphore

Discussion started by: italian_boy

7. Shell Programming and Scripting

semaphore

Discussion started by: gokult

8. Programming

Semaphore

Discussion started by: rupeshkp728

9. Solaris

Semaphore

Discussion started by: aarjun07

10. UNIX for Beginners Questions & Answers

Semaphore

Discussion started by: uniran

LEARN ABOUT MOJAVE

sem_unlink