https://outofsrvc.github.io/en/tags/processes/Recent content in Processes on P01NTHugoenWed, 26 Aug 2026 00:00:00 +0300https://outofsrvc.github.io/en/os/os-0x3/Wed, 26 Aug 2026 00:00:00 +0300https://outofsrvc.github.io/en/os/os-0x3/<p>بسم الله</p> <p>This article is dedicated to Processes &amp; Threads, which exist in every operating system.</p> <h2 id="processes">Processes</h2> <p>Briefly, a process is a program in execution.</p> <p>A process has a structure inside the kernel called KProcess, or the Process Control Block (PCB), which the kernel uses to control this process&rsquo;s operations.</p> <p>The PCB contains many fields; the most important:</p> <ol> <li><strong>Process State:</strong> the state of the process.</li> <li><strong>Process Number:</strong> the process&rsquo;s number.</li> <li><strong>Program Counter:</strong> the program counter.</li> <li><strong>Registers:</strong> the registers belonging to the process.</li> </ol> <p><img alt="PCB structure and fields" decoding="async" loading="lazy" src="https://outofsrvc.github.io/assets/img/os/os-0x3/pcb-fields.png"> <em>Figure (1): The process control block</em></p>