disastrOS_globals.h

#pragma once
#include "disastrOS_pcb.h"

/*
  Global variables used by disastrOS

*/

//semaphores list
extern ListHead semaphores_list;

extern PCB* init_pcb; // pcb of the init process
extern PCB* running;  // pcb of the currently running process
extern int last_pid;  // last pid to be generates
extern ListHead ready_list; // list of the ready processes
extern ListHead waiting_list; // list of the waiting processes
extern ListHead zombie_list;  // zombies
extern ListHead resources_list; // resources
extern ListHead semaphores_list; //semaphores
extern ListHead timer_list;     //timers (concrete)
extern volatile int disastrOS_time; //global time of disastrOS

// a resource can be a device, a file or an ipc thing

typedef void(*SyscallFunctionType)();


// these are used for "trapping" in protected mode
extern ucontext_t main_context;

// this is used for shutting down (set it to 1, and return the control to main)
extern int shutdown_now;