Message passing / mail system

kernel/proc/resource.c

@@ -5,6 +5,7 @@
 #include <libk/string.h>
 #include <mm/liballoc.h>
 #include <mm/pmm.h>
+#include <proc/mail.h>
 #include <proc/mutex.h>
 #include <proc/proc.h>
 #include <proc/procgroup.h>
@@ -49,6 +50,32 @@ struct proc_resource* proc_create_resource_mutex (struct procgroup* procgroup, i
   return resource;
 }
 
+struct proc_resource* proc_create_resource_mail (struct procgroup* procgroup, int rid) {
+  struct proc_resource* resource;
+
+  resource = proc_find_resource (procgroup, rid);
+  if (resource != NULL)
+    return resource;
+
+  resource = malloc (sizeof (*resource));
+  if (resource == NULL)
+    return NULL;
+
+  memset (resource, 0, sizeof (*resource));
+  resource->lock = SPIN_LOCK_INIT;
+  resource->ops.cleanup = &proc_cleanup_resource_mail;
+  resource->u.mail.resource = resource;
+  resource->rid = rid;
+  resource->type = PR_MAIL;
+
+  spin_lock (&procgroup->lock);
+  rbtree_insert (struct proc_resource, &procgroup->resource_tree, &resource->resource_tree_link,
+                 resource_tree_link, rid);
+  spin_unlock (&procgroup->lock);
+
+  return resource;
+}
+
 bool proc_delete_resource (struct proc_resource* resource, struct cpu** reschedule_cpu) {
   bool reschedule = resource->ops.cleanup (resource, reschedule_cpu);
   free (resource);