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Critical Resources and Mutual Exclusion Resources that require processes to access them in a mutually exclusive manner are termed critical resources. Principles of Synchronization Mechanisms Wait if idle: Allow entry when the resource is free. Busy then wait: Block entry while the resource is occupied. Bounded waiting: Guarantee that no proces ...

Shared memory represents the fastest form of Inter-Process Communication (IPC). Once a memory region is mapped into the address space of multiple processes, data transfer between them no longer requires kernel intervention. This eliminates the overhead of system calls for data exchange between processes. The System V IPC mechanism includes thre ...

Iceoryx Architecture 1.1 Overview This section outlines the architectural design and core principles of Eclipse Iceoryx, a zero-copy inter-process communication (IPC) middleware designed for high-performance systems. ### 1.2 Software Layers Eclipse Iceoryx is structured into several modular components that work together to enable efficient, ...

FreeRTOS task notifications offer a highly optimized mechanism for inter-task communication (IPC) and synchronization, serving as a lighter alternative to traditional message queues, semaphores, or mutexes. Unlike these kernel objects, task notifications do not require explicit creation or allocation of separate kernel memory. Instead, the nece ...

Handling Standard Signals #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> void signal_handler(int sig_num) { if (sig_num == SIGINT) { printf("Ctrl+C signal received\n"); } } int main(void) { // Set SIGINT to be ignored if (signal(SIGINT, SIG_IGN) == SIG_E ...

Inter-Process Communication (IPC) enables different processes to exchange data and coordinate operations within an operating system. Below are common IPC mechanisms along with implementation examples for both Windows and Linux platforms. Fundamentals Pipe: A half-duplex communication channel typical used between related processes like parent-c ...

Inspecting Process Memory Usage Using top PID – Process ID USER – Owner PR – Priority (lower = higher) NI – Nice value VIRT – Virtual memory RES – Physical memory SHR – Shared memory S – State (S=sleep, R=run, Z=zombie, N=negative nice) %CPU – CPU usage %MEM – Physical memory ratio TIME+ – Cumulative CPU time COMMAND – Execu ...

Basic Signal Handling #include <signal.h> #include <unistd.h> #include <stdio.h> void signal_handler(int signum) { if (signum == SIGINT) { printf("User pressed CTRL + C\n"); } } int main() { // Capture SIGINT signal if (signal(SIGINT, signal_handler) == SIG_ERR) { perror("signal ...

Understanding IPC Objects System V IPC provides three main inter-process communication mechanisms known as IPC objects: message queues, shared memory, and semaphore arrays. These objects exist in kernel space and are globally accessible through unique identifiers, enabling communication between unrelated processes. IPC objects persist in the sy ...

Linux provides multiple mechanisms for processes to exchange data and coordinate execution. These range from simple notifications to complex shared data structures, each optimized for specific use cases regarding speed, relationship between processes, and data volume. Signal-Based Notification Signals represent the asynchronous communication la ...