Samir's Engineering Notes and Projects

// arch/x86/include/asm/switch_to.h
#define switch_to(prev, next, last) do {
    /* Save previous task's context */
    asm volatile(
        "pushfl\n\t"              /* Save flags */
        "pushl %%ebp\n\t"         /* Save base pointer */
        "movl %%esp,%[prev_sp]\n\t" /* Save stack ptr */
        "movl %[next_sp],%%esp\n\t" /* Load next stack */
        "movl $1f,%[prev_ip]\n\t"   /* Save return IP */
        "pushl %[next_ip]\n\t"      /* Push next IP */
        "jmp __switch_to\n\t"       /* Context switch */
        "1:\t"
        "popl %%ebp\n\t"          /* Restore base ptr */
        "popfl\n"                 /* Restore flags */
        : [prev_sp] "=m" (prev->thread.sp),
          [prev_ip] "=m" (prev->thread.ip)
        : [next_sp]  "m" (next->thread.sp),
          [next_ip]  "m" (next->thread.ip),
          [prev]     "a" (prev),
          [next]     "d" (next)
        : "memory", "cc"
    );
} while (0)

export default {
  async fetch(request, env) {
    // This code handles any scale automatically
    return new Response("Hello World");
  }
}

# Repository Link
https://github.com/SamirPaulb/DSAlgo

// Conceptual V8 Isolate Execution Model
class WorkerIsolate {
    constructor(code) {
        this.context = new V8.Context();  // Created in microseconds
        this.globals = this.setupGlobals();
        this.code = code;
    }
    async handleRequest(request) {
        // Worker code executes here, isolated from other workers
        return await this.code.fetch(request);
    }
}