memory sharing - not shared memory

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Shared memory

Dear Reader, Is is necessary to attach / dettach the shared memory segments for write operations , if more than one program is accessing same shared memory segments.. I have used semaphore mutex and still I'm getting segmentation fault when I write to the segment when other program is already...

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I am running HP-UX B.11.11. I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used. But when I try to start the DB with the increased buffer parameter I get told. "Not...

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I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability. Obviously, I'll have to worry about mutual exclusion.

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Shared Memory

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shared memory

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Memory sharing with NCURSES

Hey, Im using a shared memory segment to share a WINDOW structure among 2 processes. Basically I'm building a multi-player snake game in which multiple prrocesses access the window. The 'parent' process initializes the shared memory segment and puts the window in it. I can access and perform...

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Shared library with acces to shared memory.

Hello. I am new to this forum and I would like to ask for advice about low level POSIX programming. I have to implement a POSIX compliant C shared library. A file will have some variables and the shared library will have some functions which need those variables. There is one special...

LEARN ABOUT DEBIAN

sm2file

SM2FILE(1)							  ICI executables							SM2FILE(1)

NAME

       sm2file - shared-memory linked list data extraction test program

SYNOPSIS

       sm2file

DESCRIPTION

       sm2file stress-tests shared-memory linked list data extraction by retrieving and deleting all text file lines inserted into a shared-memory
       linked list that is the root object of a PSM partition named "file2sm".

       The operation of sm2file echoes the cyclical operation of file2sm: the EOF lines inserted into the linked list by file2sm punctuate the
       writing of files that are copies of file2sm's original source text file.  The name of each file written by sm2file is file_copy_cycleNbr,
       where cycleNbr is, in effect, the count of EOF lines encountered in the linked list up to the point at which the writing of this file
       began.

       sm2file may catch up with the data ingestion activity of file2sm, in which case it blocks (taking the file2sm test semaphore) until the
       linked list is no longer empty.

EXIT STATUS

       0   sm2file has terminated.

FILES

       No configuration files are needed.

ENVIRONMENT

       No environment variables apply.

DIAGNOSTICS

       can't attach to shared memory
	   Operating system error.  Check errtext, correct problem, and rerun.

       Can't manage shared memory.
	   PSM error.  Check for earlier diagnostics describing the cause of the error; correct problem and rerun.

       Can't create shared memory list.
	   PSM error.  Check for earlier diagnostics describing the cause of the error; correct problem and rerun.

       Can't create semaphore.
	   ION system error.  Check for earlier diagnostics describing the cause of the error; correct problem and rerun.

       Can't open output file
	   Operating system error.  Check errtext, correct problem, and rerun.

       can't write to output file
	   Operating system error.  Check errtext, correct problem, and rerun.

BUGS

       Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>

SEE ALSO

       file2sm(1), smlist(3), psm(3)

perl v5.14.2							    2012-05-25								SM2FILE(1)

10 More Discussions You Might Find Interesting

1. Programming

Shared memory

Discussion started by: joseph_shibu

2. UNIX for Advanced & Expert Users

Shared memory shortage but lots of unused memory

Discussion started by: cjcamaro

3. UNIX for Advanced & Expert Users

mmap vs shared memory - which is best for sharing data between applications?

Discussion started by: nmds

4. Linux

all about shared memory

Discussion started by: vijaya2006