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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

Shared data Problems and its solutions

Assume that several ISRs or tasks share a variable. If there is a variable currently running under a task and there is an interrupt and some other task will be taking the control of that variable. Since the variable is already used by other task, so there comes a shared data problem.
The bugs encountered in the above process can be eliminated by means of following techniques
  • use of volatile modifier - this declaration warns the compiler that certain variables can modify because the ISR does not consider the fact that the variable is also shared with a calling function
  • reentrant function - part of a function that needs its complete execution before it can be interrupted. This part is called the critical section.
  • put a shared variable in a circular queue - a function that requires the value of this variable always delete it from the queue front and another function which inserts the value of this variable,a lways does so at the queue back.
  • Disabling the interrupts before a critical section starts executing and enable the interrupts on its completion. In this method, the high priority task or ISRs will be waiting because of the disabling of the interrupts
  • Semaphores- which is a nice option for shared data problems and it is efficient also

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