Manage int IDs via id_alloc

kernel/amd64/bootmain.c

@@ -64,6 +64,9 @@ void bootmain (void) {
     spin ();
   }
 
+  proc_pid_alloc_init ();
+  procgroup_pgid_alloc_init ();
+
   smp_init ();
 
   proc_init ();

kernel/amd64/proc.c

@@ -17,8 +17,6 @@
 #include <sys/debug.h>
 #include <sys/proc.h>
 
-static atomic_int pids = 0;
-
 struct proc* proc_from_elf (uint8_t* elf_contents) {
   struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
 
@@ -30,7 +28,12 @@ struct proc* proc_from_elf (uint8_t* elf_contents) {
 
   proc->lock = SPIN_LOCK_INIT;
   proc->state = PROC_READY;
-  proc->pid = atomic_fetch_add (&pids, 1);
+  proc->pid = proc_alloc_pid ();
+
+  if (proc->pid < 0) {
+    free (proc);
+    return NULL;
+  }
 
   proc->procgroup = procgroup_create ();
   if (proc->procgroup == NULL) {
@@ -72,7 +75,12 @@ struct proc* proc_clone (struct proc* proto, uintptr_t vstack_top, uintptr_t ent
 
   proc->lock = SPIN_LOCK_INIT;
   proc->state = PROC_READY;
-  proc->pid = atomic_fetch_add (&pids, 1);
+  proc->pid = proc_alloc_pid ();
+
+  if (proc->pid < 0) {
+    free (proc);
+    return NULL;
+  }
 
   spin_lock (&proto->lock);
 
@@ -108,6 +116,7 @@ void proc_cleanup (struct proc* proc, struct reschedule_ctx* rctx) {
 
   procgroup_detach (proc->procgroup, proc, rctx);
 
+  proc_free_pid (proc->pid);
   /* clean the process */
   free (proc);
 }