Generate new PIDs for processes

kernel/amd64/proc.c

@@ -9,6 +9,8 @@
 #include <sync/spin_lock.h>
 #include <sys/debug.h>
 
+static atomic_int pids = 1;
+
 struct proc* proc_from_elf (uint8_t* elf_contents) {
   struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
 
@@ -54,6 +56,7 @@ struct proc* proc_from_elf (uint8_t* elf_contents) {
   proc->pdata.regs.rip = aux.entry;
   proc->lock = SPIN_LOCK_INIT;
   atomic_store (&proc->state, PROC_READY);
+  proc->pid = atomic_fetch_add (&pids, 1);
 
   return proc;
 }