Implement streams IPC mechanism

kernel/proc/resource.c

@@ -12,6 +12,7 @@
 #include <proc/procgroup.h>
 #include <proc/reschedule.h>
 #include <proc/resource.h>
+#include <proc/stream.h>
 #include <sync/spin_lock.h>
 #include <sys/debug.h>
 
@@ -96,6 +97,46 @@ struct proc_resource* proc_create_resource_mail (struct procgroup* procgroup) {
   return resource;
 }
 
+struct proc_resource* proc_create_resource_stream (struct procgroup* procgroup) {
+  uint64_t fpg;
+
+  struct proc_resource* resource;
+
+  resource = malloc (sizeof (*resource));
+  if (resource == NULL)
+    return NULL;
+
+  memset (resource, 0, sizeof (*resource));
+
+  spin_lock (&procgroup->lock, &fpg);
+
+  resource->rid = id_alloc (&procgroup->rid_alloc);
+
+  if (resource->rid < 0) {
+    free (resource);
+    spin_unlock (&procgroup->lock, fpg);
+    return NULL;
+  }
+
+  resource->lock = SPIN_LOCK_INIT;
+  resource->ops.cleanup = &proc_cleanup_resource_stream;
+  resource->u.mail.resource = resource;
+  resource->type = PR_STREAM;
+
+  if (!ringbuffer_init (&resource->u.stream.ringbuffer, PROC_STREAM_MAX, 1)) {
+    free (resource);
+    spin_unlock (&procgroup->lock, fpg);
+    return NULL;
+  }
+
+  rbtree_insert (struct proc_resource, &procgroup->resource_tree, &resource->resource_tree_link,
+                 resource_tree_link, rid);
+
+  spin_unlock (&procgroup->lock, fpg);
+
+  return resource;
+}
+
 void proc_delete_resource (struct procgroup* procgroup, struct proc_resource* resource,
                            struct reschedule_ctx* rctx) {
   uint64_t fr, fpg;