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Operating System Articles
Page 66 of 171
How does System Boot work?
The system boot process is the sequence of steps that occurs when a computer starts up, transforming it from a powered-off state to a fully operational system. The BIOS, operating system, and hardware components must all work correctly for successful booting. System Boot Process The boot process involves several distinct phases, each with specific responsibilities for system initialization. System Boot Process Flow Power On CPU Initialization ...
Read MoreOperating System Debugging
Operating System Debugging is the systematic process of identifying, analyzing, and resolving issues within computer systems. Modern operating systems employ various debugging mechanisms to maintain system stability and help developers diagnose problems effectively. Log Files Log files serve as comprehensive records of system activities, capturing events, errors, and state changes. The operating system writes structured messages to these files, creating an audit trail for troubleshooting and system analysis. Types of Log Files Log Files ...
Read MoreLoadable Modules Architecture of the Operating System
Loadable kernel modules are object files containing code that extends the running kernel (also called the base kernel) of an operating system. These modules provide a flexible way to add support for new file systems, hardware drivers, system calls, and other kernel functionality without modifying the core kernel code. Loadable modules allow the operating system to dynamically load and unload kernel components as needed, making the system more modular and efficient. Loadable Modules Architecture Base Kernel Core OS Functions ...
Read MoreWhat is Zombie Process in Linux?
A zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child's exit status. Once this is done using the wait() system call, the zombie process is eliminated from the process table. This is known as reaping the zombie process. Zombie Process Life Cycle Parent Process Child Process ...
Read MoreWhat are the different states of a Process?
A process is an active program under execution. It includes the program counter, process stack, registers, and program code, making it more comprehensive than just the static program code (text section). A process passes through different states during its execution lifecycle. While these states may vary across operating systems, the fundamental process states are standardized. The diagram below illustrates the common process states and their transitions − Process State Diagram New Ready ...
Read MoreCritical Section Problem
The critical section problem occurs when multiple processes access shared resources concurrently. A critical section is a code segment where shared variables can be accessed. To maintain data consistency, only one process can execute in its critical section at a time — this requires an atomic operation. All other processes must wait to execute in their critical sections. Critical Section Structure Process 1 Entry Section Critical Section ...
Read MoreThe Benefits of Multithreaded Programming
Multithreading allows the execution of multiple parts of a program at the same time. These parts are known as threads and are lightweight processes available within the process. So multithreading leads to maximum utilization of the CPU by multitasking. Threads within a process share the same memory space but have their own execution context, including program counter, stack, and registers. This enables efficient parallel execution while maintaining data sharing capabilities. Key Benefits of Multithreaded Programming Benefits of Multithreaded Programming Multithreading ...
Read MoreRunning vs Waiting vs Terminated Process
A process is an active program under execution. It is more than just program code as it includes the program counter, process stack, registers, and program code. As a process executes, it transitions through different states based on its current activity and resource availability. The process state diagram illustrates how processes move between different states during their lifecycle − Process State Diagram NEW READY RUNNING ...
Read MoreShared Memory Model of Process Communication
Process communication is the mechanism provided by the operating system that allows processes to communicate with each other. This communication could involve a process letting another process know that some event has occurred or transferring of data from one process to another. One of the models of process communication is the shared memory model. The shared memory in the shared memory model is the memory that can be simultaneously accessed by multiple processes. This is done so that the processes can communicate with each other. All POSIX systems, as well as Windows operating systems use shared memory. ...
Read MoreMutex vs Semaphore
Mutex and Semaphore are both synchronization mechanisms used in operating systems to coordinate access to shared resources between multiple threads or processes. While they serve similar purposes, they have distinct characteristics and use cases. Mutex A Mutex (Mutual Exclusion) is a locking mechanism that ensures only one thread can access a critical section at a time. It acts like a binary lock that can be either acquired or released by a thread. How Mutex Works wait(mutex); // Critical Section // Only one thread can execute here signal(mutex); Key characteristics of Mutex: ...
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