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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Communication Via Files (IPC)

This is one of the oldest way of data exchange in which the information is sent as a file.

File needs two type of locking

Mandatory Locking

  • Read wirte is blocked during the entire locking period

Advisory locking

  • Allows Read and write even after the lock has been set
  • processes accessing the file for Read and Write has to lock it and release it again

Locking Entire Files

There are two methods for locking the entire file

First Method is by the use of several system calls

  • link – a system call
  • create – another system call
  • combination of flags like O_CREAT and O_EXEC with open (system call)
  • lock a fle with open() function using O_CREAT | O_WRONLY | O_TRUNK, but this option fails under the superuser mode

Second Method

fcntl – A system call to lock the entire file. It is also useful to lock the file areas. In Linux 2.0 it is called flock() which is not advisable to use.

Locking file areas

int sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg);

int sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg);

where fd – file descriptor

cmd – includes F_GETLK, F_SETLK, F_SETLKW

Semantics of fcntl locks

Existing Lock Setting a read lock Write lock
None Possible Possible
More than One Possible Not Allowed
A Write Lock Not Allowed Not Allowed

Locking files may also lead to deadlock with the following example

Assume there are two processes wanted to read a file,

P1  -> 1 –> 2  (P1 tries to access the 1st block and then 2nd block within a file)

P2 –> 2  -> 1  (P2 tries to access the 2nd block and then 1st block within a file)

Now for getting the 2 and the 1st block, both processes will be in deadlock,

So Communication via files may not be a great option, of course there are some methods to avoid the deadlocks.

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