Implement waiting for process, CE add command cancelation, rctx many cpus

kernel/proc/mutex.c

@@ -37,6 +37,8 @@ void proc_mutexes_cleanup (struct proc* proc, struct reschedule_ctx* rctx) {
 
       proc_mutex_unlock (proc, &resource->u.mutex, rctx);
     }
+
+    spin_unlock (&resource->lock);
   }
 
   spin_unlock (&proc->procgroup->lock);