Priority queue implementation

include/grub/priority_queue.h

@@ -0,0 +1,36 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2011 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_PRIORITY_QUEUE_HEADER
+#define GRUB_PRIORITY_QUEUE_HEADER 1
+
+#include <grub/misc.h>
+#include <grub/err.h>
+
+struct grub_priority_queue;
+typedef struct grub_priority_queue *grub_priority_queue_t;
+typedef int (*grub_comparator_t) (const void *a, const void *b);
+
+grub_priority_queue_t grub_priority_queue_new (grub_size_t elsize,
+					       grub_comparator_t cmp);
+void grub_priority_queue_destroy (grub_priority_queue_t pq);
+void *grub_priority_queue_top (grub_priority_queue_t pq);
+void grub_priority_queue_pop (grub_priority_queue_t pq);
+grub_err_t grub_priority_queue_push (grub_priority_queue_t pq, void *el);
+
+#endif