Online courses directory (13677)

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In this free online course Operating Systems - Introduction to Memory Management you will learn about the different models for memory management. You will learn about virtual memory and segmentation the more modern versions of memory management compared to the models. You will learn about booting up a computer system and how and what it loads up till it gets to the user’s process.<br /><br />The course begins by introducing you to memory management in a computer system. You will learn about the single contiguous model and the partition model for memory management. You will learn about virtual memory, its structure and how the virtual address is mapped to a physical one.<br /><br />Next, you will be introduced to segmentation. You will learn how segmentation is more logical in dividing up a process compared to virtual memory. You will also learn how segmentation maps to physical addresses. You will learn about the structure of the xv6 operating systems memory and about the booting process when a computer system is powered on.<br /><br />This course would be of great interest to computer science students and computer engineers, and anyone who wants to learn more about memory management in computer operating systems.<br /><br />Perquisites: Learner will need to have completed the previous course Introduction to Operating Systems.

In the free online course Operating Systems - Introduction to Scheduling you will learn about scheduling processes in an operating system. The course also reviews methods for scheduling with a single processer, multi-processers, and scheduling in a Linux operating system.<br /><br />The course begins by introducing you to process scheduling. You will learn about the two types or classifications for processes: first come first serve scheduling and its advantages and disadvantages, and other scheduling techniques such as Shortest job first and Round Robin scheduling and what they involve. You will learn about priority based scheduling and about setting priorities for your processes, and techniques for multi-processer scheduling and how they work.<br /><br />Next, you will be introduced to scheduling in a Linux operating system. You will learn how Linux classifies processes into real time and normal processes, about the different schedulers Linux has used in their systems and how they work. The course also covers Completely fair scheduling (CFS), the main scheduler used in Linux currently, and how the CFS selects processes for running.<br /><br />This free Alison course will be of great interest to computer science students and computer engineers, and anyone who wants to learn about scheduling in computer operating systems<br /><br />Perquisites: The learner will need to have completed the previous courses: Introduction to Operating Systems, Introduction to Memory Management, Introduction to Operating Systems Processes and Introduction to Operating Systems Interrupts.

In the free online course Operating Systems - Introduction to Synchronization you will learn about Inter-process Communication (IPC) for process communication and data sharing. The course also introduces you to shared memory, message passing and signals all methods for IPC. <br /><br />You will learn about the critical section and problems accessing the critical section. You will learn about ways to access the critical section and how hardware can also help accessing it. <br /><br />The course begins by introducing you to Inter Process Communication (IPC). You will learn the main ways processes share data and communicate with each other. The course then introduces process synchronization and the Critical section, how to access the critical section using interrupts and build your own solution.<br /><br />Next, you will be introduced to the bakery algorithm, which is another method for accessing the critical section. You will learn about how hardware can help with accessing the critical section, and about the test &amp; set instruction, why Intel doesn’t support it but instead has its own xchg instruction. You will learn about Spinlocks, Mutexes and Semaphores and how they help with accessing the critical section. <br /><br />This free Alison course will be of great interest to computer science students and computer engineers, and anyone who wants to learn about Inter-process communication in computer operating systems.<br /><br />Perquisites: The learner will need to have completed the previous courses; Introduction to Operating Systems, Introduction to Memory Management, Introduction to Operating Systems Processes, Introduction to Operating Systems Interrupts and operating systems scheduling.

In the free online course Operating Systems - Understanding Hardware and Software Interrupts you will be introduced to interrupts and will learn operating how systems handle interrupts. <br /><br />The course begins by introducing you to interrupts in an operating system. You will learn about the different types of interrupts and how a system handles a hardware interrupt. You will learn about a programable interrupt controller and how it handles hardware interrupts. You will learn about the advanced programable interrupt controller, and how it is used for modern system. You will learn about steps in handling an interrupt. You will learn about what the CPU and operating system do in each of the steps in handling an interrupt.<br /><br />Next, you will be introduced to software interrupts, and how they are used for implementing system calls. You will learn about how system calls work and about some of the different types of system calls you can use. You will learn about the parameters passed into a system call and where they come from. You will learn what a resource descriptor is used for in a system call. You will learn about CPU context switching and when the occur. You will learn about the trap frame and what happens when a software interrupt occurs. You will learn about context switch overheads and factors effecting context switching time.<br /><br />This course will be of great interest to computer science students and computer engineers, and anyone who wants to learn more about Interrupts in computer operating systems.<br /><br />Perquisites: The Learner will need to have completed the previous courses: Introduction to Operating Systems, Introduction to Memory Management, Introduction to Operating Systems Processes.

In this free Alison course Operating Systems - Deadlocks and Threads you will be introduced to the important concepts of deadlocks and threads and their occurrence in operating systems. <br /><br />The course begins by introducing you to deadlocks. You will learn about the four conditions necessary for a deadlock to arise and how to prevent deadlocks from happening. The course also explains the concept semaphores and their role in deadlocks. You will also learn about the role of mutex in preventing deadlocks and be able to explain the dining philosopher’s problem. <br /><br />Next, this course will introduce you to threads. You will learn the difference between threads and processes and explain how different operating systems supports the use of threads. You will also learn about paralyzation and how threads are used in paralyzation. In addition, the course will also describe to you how threads are created and destroyed.<br /><br />This free course will be of great interest to computer science students and computer engineers, and anyone who wants to learn more about deadlocks and threads in computer operating systems.

In this free Alison course Operating Systems - System Security you will be introduced to methods and techniques that are used to secure operating systems from malicious bugs and viruses. Security has become extremely important in the modern digital age because systems are always on and are highly connected, and hackers and cyber-criminals are always looking for ways to insert malicious programs into vulnerable operating systems. <br /><br />The course begins by introducing you to secrecy, integrity, and availability with regard to security goals. You will learn about the denial of service attacks and the different access control techniques that can be used. This course will introduce you to information flow policies and leaky states and will also inform you about the difference between the Biba model and Bell-LaPadula module.<br /><br />Next, the course will provide you with in-depth knowledge on buffer overflows and stacks. You will learn about the use of buffer overflows and how an attacker can use these to create an exploit code. You will be able to implement different techniques to overcome buffer overflow vulnerability. This module will also explain libc and ‘how to return libc attacks’. Finally, you will learn what gadgets are in operating systems and how they can be used. <br /><br />This free course will be of great interest to computer science students and computer engineers, and anyone who wants to learn more about systems security in computer operating systems.<br />

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