EmbLogic » vikrant.verma

Character Device Driver : Semaphore

vikrant.verma — Fri, 07 Mar 2014 08:16:00 +0000

implementation of semaphore in kernel.

There are using three application at user level.

In 1st application three threads using for Open,Write and close.

in 2nd application three threads using for Open,read and close.

And last application is same as 2nd app.

thread semaphore is also used for synchronize the operation in every single application.

At Kernel level: when file open in Read-only mode it wait for completion of write operation then after semaphore release to access by both reader.

Character Driver: lseek complete

vikrant.verma — Mon, 03 Mar 2014 05:49:33 +0000

RCS file: ./lseek.c,v
Working file: ./lseek.c
head: 1.3
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 3; selected revisions: 3
description:
lseek operation done.

revision 1.3
date: 2014/02/27 18:30:59; author: root; state: Exp; lines: +7 -0
at last new file position recevied for read operation.
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revision 1.3
date: 2014/02/27 18:30:59; author: root; state: Exp; lines: +7 -0
in lseek function use cases for SEEK_SET(0),SEEK_CURR(1),SEEK_END(2).
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revision 1.2

date: 2014/02/27 18:30:59; author: root; state: Exp; lines: +7 -0

declared loff_t nfpos .
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revision 1.1
date: 2014/02/27 18:28:22; author: root; state: Exp;
Initial revision

Character driver: Write Operation For Multiple Quantum

vikrant.verma — Sun, 23 Feb 2014 18:25:00 +0000

head 1.18;
access;
symbols;
locks; strict;
comment @ * @;

1.8
date 2014.02.23.16.17.34; author root; state Exp;
branches;
next 1.7;

1.7
date 2014.02.23.16.16.23; author root; state Exp;
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date 2014.02.23.16.13.47; author root; state Exp;
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date 2014.02.23.16.12.39; author root; state Exp;
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1.4
date 2014.02.23.16.11.31; author root; state Exp;
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date 2014.02.23.16.07.57; author root; state Exp;
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date 2014.02.23.16.01.14; author root; state Exp;
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date 2014.02.23.15.43.40; author root; state Exp;
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work on character driver : operations on open & release.

vikrant.verma — Sat, 15 Feb 2014 09:58:44 +0000

CHARACTER DEVICE DEVELOPMENT:

OPEN: CLOSE:

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revision 1.6
date: 2014/02/15 09:26:13; author: root; state: Exp; lines: +3 -0
*** empty log message ***
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revision 1.5
date: 2014/02/15 09:19:22; author: root; state: Exp; lines: +3 -1
release prototype use
and release: name used
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revision 1.4
date: 2014/02/15 06:19:27; author: root; state: Exp; lines: +6 -7
sync
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revision 1.3
date: 2014/02/14 11:05:24; author: root; state: Exp; lines: +1 -1
sync
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revision 1.2
date: 2014/02/14 10:48:51; author: root; state: Exp; lines: +2 -0
extern struct Scull_dev *scull_dev ,*lscull_dev;
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revision 1.1
date: 2014/02/14 10:13:55; author: root; state: Exp;

RCS file: ./init.c,v
Working file: init.c

proj:1

vikrant.verma — Fri, 12 Jul 2013 11:11:13 +0000

starting project1 for data compression.